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Superior Cultivars of Hybrids containing Adenium "arabicum", "obesum", & crispum This is my favorite adenium breeding line; see the hybrid page for details. In short, plants with this parentage grow fast to about 2 to 3 feet tall and wide, with good caudexes, sturdy stems, and brightly colored flowers most of the year. They are tetraploid, which gives them extra sturdiness and vigor. They're very tolerant of high heat, near-freezing temperatures, and overwatering. Oh - and they're all evergreen. No more panicking when the leaves all turn yellow and fall off. This is a new line of breeding that I began in 2010, so there are very few good cultivars to date. 'Beautiful Loser' 'St. Elmo's Fire' 'Nearly Perfect' 'Tetra Splash #927' 'Radiant Dawn' 'Starbright' 'Beautiful Loser' (MAD532) Parentage: Adenium "obesum" x "arabicum" x crispum complex hybrid (A. "arabicum" x "obesum") 'MAD421' x (A. "obesum" x crispum) 'Happy Princess' Creator: Dimmitt 2009 Plant form: Amazingly vigorous, floppy shrub with giant caudex. Evergreen. Tetraploid. Flower: Round, 60 mm diameter x 23 mm petal width. Petals light red, mostly covered by heavy dark red lines. At the juncture of each two petals, there is a yellow protuberance (? don't know what to call it). Petals tend to quill as they age. Throat yellow, but mostly obscured by prominent red nectar guides. Always in bloom, often profusely. Notes: This was my first arabicum-obesum-crispum hybrid. Only one seed germinated from the cross, and it grew like a weed. I was really excited about it, until it developed its mature form at about 5 years. Super-fast growth, huge caudex, perpetually in bloom with superb flowers. What's wrong with it? If it wasn't brutally pruned and staked, the stems would be lying on the ground! I would have thrown it out, but it redeems itself by being the most fertile breeder in my tetraploid line. It will cross with nearly every other 4n plant that I've matched it with. Its good traits usually come through in the offspring (including the yellow thingys at the throat), and sometimes the floppy stems are lost. Above: The original seedling of adenium 'Beautiful Loser' at 12 years old in a 16-inch pot. Notice all the stakes. In addition, I have pruned off far more biomass than is currently present. Back to Menu Above: The flowers of adenium 'Beautiful Loser'. There must be a term for those yellow bumps? Only a few adeniums have such prominent ones. Above: The original seedling of adenium 'Nearly Perfect #776' at 7 years old in a 16-inch pot. Above: The original seedling of 'Nearly Perfect #776' at 8 years old. 'Nearly Perfect #776' Parentage: Adenium "obesum" x "arabicum" x crispum complex hybrid ('Beautiful Loser' x 'Prolific Behemoth') Creator: Dimmitt 2012 Plant form: Vigorous, upright shrub with large caudex and main stems. Evergreen. Tetraploid Flower: Round, 75 mm diameter x 30 mm petal width. Petals crimson with no fading toward the throat, and large, slightly darker red blotch in petal center. At the juncture of each two petals, there is a yellow protuberance (? don't know what to call it). Throat yellow, but mostly obscured by prominent red nectar guides. Always in bloom, with heavy flushes two or three times a year. Notes: Nearly Perfect is a group term that I use for a few plants that are very similar in being upright shrubs with big caudexes and dark red flowers over a long season. So far only two clones have been selected: MAD776 and MAD777. They also grow superbly from cuttings; no need to graft. Above: The flower of adenium 'Nearly Perfect #776'. Above: A 1-year-old cutting of 'Nearly Perfect #776'. Above: The original seedling of adenium 'Nearly Perfect #776' at 8 years old in a 16-inch pot. Right: Another clone of the Nearly Perfect group: 'Nearly Perfect #777' at 8 years old in a 16-inch pot. Inset: the flower. It's almost identical to #776. Back to Menu 'Radiant Dawn' (MAD689) Parentage: Adenium "obesum" x "arabicum" x crispm complex hybrid ((A. "obesum" x crispum) 'Lily') x a 4th generation (A. "arabicum"-"obesum"-crispum) 'MAD610)) Creator: Dimmitt 2011 Plant form: Medium-sized, spreading shrub with very large caudex. Grows to about 3 feet tall and wide in 10 years. Evergreen. Tetraploid Flower: Round, 72 mm diameter x 29 mm petal width. Petals pink with many darker pink lines. Throat yellow with prominent red nectar guides. Always in bloom, with heavy flushes two or three times a year. Notes: This clone grows easily from cuttings; no need to graft. Back to Menu Above left: The original seedling of adenium 'Radiant Dawn' at 9 years old in a 16-inch pot. Right: the same plant at 11 years. Above: The flowers of adenium 'Radiant Dawn'. Above: The original seedling of adenium 'Starbright' at 10 years old in a 16-inch pot. 'Starbright' (MAD819) Parentage: Adenium "obesum" x "arabicum" x crispum complex hybrid 'Beautiful Loser' x a 4th generation (A. "arabicum"-"obesum"-crispum) 'MAD650)) Creator: Dimmitt 2012 Plant form: Compact, spreading shrub with modest caudex. Grows to about 3 feet tall and wide in 10 years. Sturdy stems need no pruning. Evergreen. Tetraploid Flower: Star-shaped, 76 mm diameter x 28 mm petal width. Petals open flat, but become recurved and quilled after a few days; pink base nearly obscured by nearly solid red streaking. Throat yellow with prominent red nectar guides. Always in bloom, with heavy flushes two or three times a year. High flower count, up to 16 per inflorescence. Notes: This clone grows easily from cuttings; no need to graft. Above: The flowers of adenium 'Starbright'. Back to Menu 'St. Elmo's Fire' (MAD783) Parentage: Adenium "obesum" x "arabicum" x crispum complex hybrid ('Beautiful Loser' x (lost label pollen parent) Creator: Dimmitt 2012 Plant form: Medium-sized, spreading shrub with very large caudex. Grows to about 3 feet tall and wide in 10 years. Evergreen. Tetraploid. Flower: Round, 65 mm diameter x 24 mm petal width. Petals pink with many red lines. Throat yellow with prominent red nectar guides. Always in bloom, with heavy flushes two or three times a year. Notes: This clone grows easily from cuttings; no need to graft. I love seedlings that flower at only a year old. Precocious! (and precious) Above: The flower of adenium 'St. Elmo's Fire'. Above: The original seedling of adenium 'St. Elmo's Fire' at 8 years old in a 16-inch pot. Back to Menu 'Tetra Splash #927') Parentage: Adenium "obesum" x "arabicum" x crispum complex hybrid ('Beautiful Loser' x 'MAD 743') Creator: Dimmitt 2013 Plant form: Medium-sized, upright shrub with good caudex. Grows to about 4 feet tall and 3 feet wide in 10 years. Evergreen. Tetraploid. Flower: Round, 100 mm diameter x 46 mm petal width. Petals white with large red center blotch and narrow red edge. Throat yellow with faint nectar guides. Blooms several times a year. Notes: This clone grows easily from cuttings; no need to graft. Back to Menu

Superior Cultivars of Adenium crispum Back to Gallery 'Famous Ancestor' 'Famous Ancestor' (MAD106) Above: A specimen of 'Famous Ancestor' grafted onto a 3-foot tall rootstock 9 years earlier. A. crispum can grow large and fast when boosted by a vigorous rootstock. Above: The excellent flower of 'Famous Ancestor'. Few plants of this species have such bold nectar guides. Parentage: Adenium crispum Origin: Seed from a plant collected by Gerald Barad and Seymour Linden in the 1980s. Selected by Dimmitt in 1989. Plant form: Small, spreading shrub, typical of the species, with a small caudex and large swollen roots. Flower: Star-shaped, 40 mm diameter x 13 mm petal width. Petals strongly quilled, pink with very prominent extensions of the red nectar guides that extend all the way to the petal tips, and these are flanked by numerous fine red lines. Throat wide, white with prominent nectar guides. Blooms profusely in spring and sporadically in other warm months. Notes : This is the only known Ade nium crispum cultivar of importance. It is a major contribution to horticulture. This clone is evidently the ancestor of all adeniums with patterned flowers (splashes, blotches, and stripes). See Dimmitt, Joseph, and Palzkill 2009 for details. Left: The wild-collected seed parent of 'Famous Ancestor'. The fusiform caudex is typical of the species, and was below ground. In cultivation most seedlings develop multiple succulent roots. Back to Menu

Back to Gallery Cultivars of Adenium boehmianum None? I don't know of any selected cultivars of this species that are important to adenium horticulture. If you know of any, please submit photos and a description using this form . Due credit will be given.

Adenium somalense Stapf Adenium somalense occurs in Somalia, Ethiopia, Kenya, and a bit into adjacent nations. The most common form in cultivation grows a tall, conical, succulent trunk, but there are also shrubby forms with subterranean caudexes. Only A. "arabicum" and socotranum have larger caudexes. The most identifiable vegetative characters are the conical caudex and light-colored veins in the leaves. The flowers are rather small, 1 to 2 inches wide. The flowers typically have narrow pointed petals (star-shaped flowers) that are white or pink with dark pink or red borders. Prominent nectar guides in the throat extend onto the petals as fainter lines, not as bold as those of most A. crispum flowers. It is not common in cultivation in the USA, but is fairly popular in more tropical countries. Adenium somalense in a 30-inch pot at a nursery in Bangkok, Thailand; the plant is 10 years old. The cutting at the base is in a 4-inch pot. Adenium somalense grown in Tucson, Arizona. It's 9 feet tall at 17 years old from seed, but has lost its roots to rot twice because of cold weather. The plants I have from Shaba National Park in Kenya are very prone to root-rot. Note the 12-inch ruler at the base. Flowers of 2 Adenium somalense clones from Shaba N.P., Kenya. The nectar guides of the flower above extend onto the petals. Two large A. somalense in a Bangkok, Thailand nursery. A multi-trunked specimen of A. somalense in Tucson, Arizona. Note the 12-inch ruler. A collected plant of the sand form of A. somalense in Tucson, Arizona. Notice the roots near the top of the bulbous caudex; these were just below the surface in nature. A fat specimen of A. somalense breaking its pot in Tucson, Arizona. An arborescent A. somalense in Tucson, Arizona. Not all clones grow huge trunks, either in nature or cultivation. Back to Top Adenium somalense in the Wild Adenium somalense east of Bargal, Somalia. Photo: Myron Kimnach Adenium somalense east of Bargal, Somalia. Photo: Myron Kimnach Adenium somalense near Bargal, Somalia. Photo: Myron Kimnach Anton Ellert next to an Adenium somalense near Lake Borgoria, Kenya. Photo: Robert H. Webb Toni Yocum next to an Adenium somalense in Kenya. Photo: Robert H. Webb Toni Yocum in an Adenium somalense in Kenya. Photo: Robert Webb Toni Yocum next to an Adenium somalense in Kenya. Photo: Robert H. Webb Above two: Two old A. somalense in Ethiopia. Photos: Jim and Roxie Esterle Above: A monstrous specimen of Adenium somalense in Ethiopia. Inset: the flower. Photo: Jim & Roxie Esterle. Above & right: It isn't certain that all of these plants in Ethiopia are Adenium somalense . Some of the flowers look more like those of the unknown taxa in the Sahel . Photos: Jim & Roxie Esterle. Right: The foliage and flower look those of A. "obesum ", or possibly A. coetanum . Photo: Jim & Roxie Esterle. Adenium somalense near Lake Baringo, Kenya. Photo: Boris Vrskovy. Adenium somalense in full bloom near Hola, Kenya. Photo: Rainer Martin (sent by Boris Vrskovy). Adenium somalense in Ethiopia. Photo: Boris Vrskovy. Three above: Flowers of Adenium somalense in Ethiopia. The center one is in Mago National Park NE of Lake Turkana. Photos: Boris Vrskovy. Above and Right: Adenium somalense near Lake Baringo, Kenya. Photos: Gaetano Moschetti. Above: Adenium somalense near Lake Baringo, Kenya. Photos: Gaetano Moschetti. Left and above: An enormous Adenium somalense near Lake Baringo, Kenya. It's surrounded by a colony of Sanseveieria with 6-foot tall leaves. Photos: Gaetano Moschetti. A shrubby Adenium somalense on the Yabelo-Konso road in SW Ethiopia.. Photo: Gaetano Moschetti. Left and above: A beautiful, red-flowered Adenium somalense in Kenya. The nectar guides extend unusually far onto the petals. Photos: Gaetano Moschetti. Left and above: Two enormous Adenium somalense specimens in Kenya. Photos: Rob Skillin. An isolated Adenium somalense on the ascent to Celdora Pass from Las Korei, Somalia. Photo: John Lavranos. Above: The sand form of Adenium somalense in northern Somalia. Most of the large caudex is below ground. Photo: Thomas Price. Left & below: Adenium somalense between Erigabo* & Burao** , Somaliland. Photo: Boris Vrskovy (Puk). Above 3: Adenium somalense near Karinga, Kenya, ca. 70 km north of Nairobi. (The very different appearing shrubby Adenium "obesum " occurs about an equal distance southeast of Nairobi.) Photos: Boris Vrskovy (Puk). Back to Top Footnotes Erigabo, also spelled as Erigavo and Ceerigaabo. Burao, also spelled Burrao, Bur'ao, and Burco.

Adenium crispum Adenium crispum occurs in a band of sandy soil near the coast of southern Somalia. (It has not been formally published as a full species, but as A. somalense var. crispum Chiov.) In nature the fusiform caudex is subterranean. Most of the root system arises from near the top of this caudex. In cultivation the caudex is raised above soil level, and the caudex reroots from the bottom. The stems are thin and rarely exceed a foot tall. The small flowers are very distinctive and serve as the best identifier: most clones have quilled petals (curled longitudinally). And most notably, the nectar guides extend well onto the petals, often all the way to the tips. (The flowers of some A. somalense have nectar guides onto the petals, but the petals are only slightly or not at all quilled.) The anther appendages often extend beyond the throat. Flat-petaled and solid red-petaled plants are known. It is not widely cultivated, probably because it is very cold-sensitive and intolerant of hot, humid weather. Adenium crispum , a collected plant. Note the scars from the original roots near the top of the caudex. An unusually tall A. crispum . W hen grafted onto a large rootstock, Adenium crispum can grow huge. This 5-year-old graft of 'Famous Ancestor ' is more than 2 meters tall, half of which is the rootstock. 4 years old in a 6-inch pot. 10 years old in a 12-inch bonsai pot. Above 3 photos: seed-grown Adenium crispum 'MAD 297', showing its slow growth through the years. 22 years old in a 16-inch bonsai pot. Flower of A. crispum 'Famous Ancestor ' with especially prominent, long nectar guides and strongly quilled petals. Back to Top A selection of Adenium crispum flowers in cultivation, showing variation in petal color, shape, and nectar guides. Adenium crispum in the Wild Adenium crispum near Warshak, Somalia Photo: Myron Kimnach Adenium crispum 40 km north of Mogadishu, Somalia on road to Warshedih Photos: John Lavranos Adenium crispum 40 km north of Mogadishu, Somalia on road to Warshedih. Photo: John Lavranos Two plants of Adenium crispum with solid red flowers. Above left: Somalia, location unknown. Photo: John Lavranos Above right: 40 km north of Mogadishu, Somalia. Photo: Gerald Barad. John Lavranos displays a recently collected plant of Adenium crispum in Somalia. Note the feeding roots on the top of the subterranean caudex. Photo: John Lavranos Back to Top Footnotes

Adenium "obesum " Roem. & Schult. Adenium "obesum" occurs in southeastern Kenya, eastern Tanzania, and northeastern Mozambique. The specific epithet is enclosed in double quotation marks because it's an incorrect name. See the nomenclature issues page for explanation. Cultivated plants of Adenium "obesum" are usually spreading shrubs with weak branches that tend to droop. Some selected cultivars are upright. Most plants have poorly developed caudexes, but a few will produce big ones with time. The flowers are the largest in the genus, typically 2 to 3 inches in diameter, and some cultivars exceed 4 inches. Petal color of wild plants is usually pink on the margins, gradually fading to white at the white or yellow throat. Modern cultivars display a wide range of brilliant colors, some with little or no fading toward the center. Flowering peaks in spring, with a smaller peak in autumn. The best cultivars are nearly everblooming. Nectar guides in the throat are usually faint or absent. The anther appendages extend to the edge of the throat or a little beyond. This is the only species that does not have a requisite winter dormant period; it can grow year round under tropical conditions. Even if dried out in winter, it tends to remain evergreen. Adenium "obesum" and its hybrids are the most common adeniums in cultivation. They have been highly selected, and are now available in a wide range of colors, including white, purple, red, and yellow. There are also bicolors, double flowers, and mutants with variegated or colored leaves. See the gallery of superior cultivars for examples of modern varieties. Above: A typical wild type Adenium "obesum" from the early 1980s. Notice the pink flowers and neglible caudex. This plant is much more upright than is typical of the species. See flower below. Above: A. "obesum" 'Red Everbloomer ', a 4-year old cutting. Image below is its flower. This is a Dimmitt selection resulting from 3 generations of breeding darker-flowered plants. Above: A. "obesum" 'Red Cloud', a Taiwan selection from 2000. The Taiwan Red strain typically has large, shiny green leaves. There are many cultivars with superb red flowers. Flower closeup is below. Above: Flowers of a typical wild type A. "obesum" . Other colors are rare in the wild. Note the fading of petal color toward the throat in all of the images of this species. Above: A. "obesum" 'Red Everbloomer '. When it first flowered in 1980, it was an excellent and exciting new color. Today it's mediocre. This is how far adenium breeding has come in 25 years. Above: A. "obesum" 'Red Cloud'. This was the best plant from 1000 seeds imported from Taiwan in 1999. See plant above. Above: A. "obesum " 'Black Ruby '. This clone flowers profusely and develops a tall, conical caudex; the plant is a 7 year old graft (the rootstock has been cropped off the image). It appears to be of the Taiwan Red strain, but it is more cold tolerant than most of those plants bred in the tropics. Above: Flower of A. "obesum" 'Black Ruby '. This cultivar was discovered in the early 1990s in a Florida nursery by James Georgusis. Beyond that its origin is unknown. The flower quality has been surpassed by numerous Taiwan selections, but this is still a great plant because of its substantial caudex, which is cylindrical or narrowly conical. Above: A. "obesum " 'Incandescent'. This is an offspring of 'Black Ruby' bred by Dimmitt in 2001. A. "obesum " 'Incandescent' flowers profusely nearly year-round. A. "obesum ", a good early pink cultivar bred by Ashish Hansoti. A. "obesum" 'MAD #286', a pink picotee with yellow throat bred by Dimmitt from Ashish Hansoti stock A. "obesum " in Vietnam. The one on the left shows the species' typical lack of a caudex. These plants have been potted higher to expose the thick roots. The plant on the right has developed a succulent trunk, which is technically not a caudex. Photo: Bev Tall. These two screenshots are from the 1971 Bruce Lee martial arts movie Big Boss (aka Fists of Fury). The final scene was filmed on an estate in Thailand, where there were numerous potted A. "obesum " around the property. Adeniums were very rare in cultivation that long ago. All of the plants are very similar - non-caudiciform shrubs with pink flowers. They're probably the same clone, grown from cuttings. Above and right: Ashish Hansoti's Tropica Nursery near Mumbai. Photos taken in 2008 of his collection of A. "obesum " that he acquired during the 1980s. There was very little diversity in adeniums at the time. Photo on right: Kevin Barber. Back to Top Above: John Lucas at his Tradewinds South Nursery (Florida) pollinating his huge specimen of A. "obesum " 'Big Mama' in the 1990s. This plant appears to have a true caudex between the roots and stems. Adenium "obesum" in the Wild Above and right: Adenium "obesum" near Nairobi, Kenya. The caudexes are underground. Some of these wild plants can be underwhelming. Photos: Robert H. Webb Above: Adenium "obesum" near Mombasa, Kenya. Photo: Gaetano Moschetti Above: Adenium "obesum" near Mombasa, Kenya. Photo: Gaetano Moschetti Above: Flowers of an Adenium "obesum" near Mombasa, Kenya. Photo: Gaetano Moschetti Above: Adenium "obesum" near Lake Natron,Tanzania. The usually subterranean roots have either been exposed by erosion, or because the plant is growing in rocky ground. Photo: Robert H. Webb Above: Adenium "obesum" near Samburo West, Kenya. The petals are darker than is typical of the species. Photo: Robert H. Webb Above: Adenium "obesum" near Salaita Hill, Kenya. Photo: James Culverwell. Back to Top Above: Adenium "obesum " "Mombasa form", grown from seed collected from the well-known population along the Nairobi-Mombasa road, Kenya. 1. This population is known to grow large caudexes. 2. Not all wild adeniums have beautiful flowers. Photos: David Palzkill. Footnotes

Cultivation What is Dormancy? What is Actively Growing? Adenium "arabicum " cultivar 'MAD 965' Adenium Culture Characteristics of Adenium Species Anchor 1 Download PDF: Anchor 2 Download PDF: Dormancy In botany, "dormant" means not actively growing. Dormant plants may retain leaves and still conduct photosynthesis, and they may also flower. Dormant and deciduous. Water consumption is nearly zero. Adenium "arabicum". In leaf, but dormant because no new leaves are being produced. Adenium "obesum". Water such plants sparingly; it doesn't consume much in this state. In leaf, but dormant because no new leaves are being produced. Adenium "obesum". Water such plants sparingly; it doesn't consume much in this state. Dormant and deciduous, but flowering. Water use is still minimal. Adenium "arabicum" 'Hansoti Dwarf'. In leaf and flowering, but it's still dormant because no new leaves are being produced. This plant uses much less water than when it is growing new stems. Adenium "arabicum" In some adeniums part or all of the foliage will suddenly turn yellow and fall. This plant has entered dormancy and watering must be sharply reduced or stopped. Adenium crispum X "obesum" hybrid 'New Star'. The dormant plant is flanked by two other crispum hybrids that are still actively growing. Growing and Active In botany, "dormant" means not actively growing. Dormant plants may retain leaves and still conduct photosynthesis, and they may also flower. This Adenium socotranum is breaking dormancy. Water use is still low, but it needs some to stimulate waking up. This 'Arabian Ruby' was evergreen through the winter, and is now breaking dormancy by producing new leaves in spring. Growing: The soft green stem of this 'Crimson Star' reveals active stem elongation as well as rapid new leaf production. This 'Arabian Ruby' was evergreen through the winter, and is now breaking dormancy by producing new leaves in spring. Active. Not dormant, but not really growing either. If kept warm and moist in winter, some adeniums continue making new leaves at a slow pace, but stem elongation is minimal. Water use is much less than during the summer growing season. Footnotes

Adenium " arabicum" x crispum hybrids As far as I know, Miles Anderson of Miles’ to Go Nursery is the only person who has successfully made this F 1 cross. He got only five viable plants, but they were fertile. They have the large caudexes and sturdy, erect branches of “arabicum ”; the small plant size, foliage, and flowers were heavily do minated by the crispum parent. Third generation plants that I grew from these plants still showed the striped petals, and mostly quilled petals. Some of these are larger, up to five feet (1.5 m) tall. In my opinion the main value of this line is contributing smaller size and striped flowers into the “arabicum” x “obesum” x crispum line . These hybrids are apparently tetraploid, because they cross only with other 4n adeniums. Above left: The star-shaped flowers of some clones have flat petals, but most will quill in a couple of days (right). Left: One of Miles Anderson's original F1 plants of Adenium "arabicum" x crispum. The caudexes are very large compared to plant size. Photo: Miles Anderson. Miles Anderson's F2 crosses of Adenium "arabicum" x crispum also have relatively huge caudexes, but the flowers are still quilled. The promise of these plants is to get cripsum 's patterned flowers and smaller plant size into the tetraploid arabicum-"obesum " line. Plant at left is 5 years old in a 14-inch pot. Footnotes

Back to Gallery Cultivars of Rare Crosses or Unknown Parentage Here are a few oddballs that don't fit anywhere else. 'Beautiful Mule' 'Flame Tree' 'Bohemian Splash' 'Singapore' 'Candy Stripes' 'Crimson Picotee' 'Winter Remedy' 'Beautiful Mule' Parentage: Complex hybrid involving Adenium "obesum", swazicum, and crispum . ('Candy Stripes' x 'Black Raspberry') 'Candy Stripes' = A. crispum 'Famous Ancestor' x A. swazicum 'Perpetual Pink' 'Black Raspberry' = A. crispum 'Famous Ancestor' x A. "obesum " 'Black Ruby' Creator: Dimmitt 2003 Plant form: Naturally arborescent with thick trunk, major branches, and massive roots. Foliage resembles that of "obesum", except for more prominent white veins as in crispum. Deciduous. It can also branch basally and become a shrub. Flower: Round at first; with age the petals elongate and quill, becoming more star-shaped. Diameter at one week 84 mm, 35 mm petal width. Petals solid crimson-red outer halves, fading to pink at throat. Throat red with darker red strong nectar guides that extend onto the petals halfway to the tips. There are white calluses where each pair of petals fuse at the throat. (They turn red in older flowers.) Flowers continuously from mid spring through late autumn. Notes: I had high hopes for this cultivar when it was young. I love tree adeniums, and the flowers borne at eye level. Alas, it's completely sterile, hence the name. It seems to have no pollen, and it has never set a fruit. Worse still, although it roots easily from cuttings, it is exceptionally susceptible to root rot. I have lost many plants from watering once too late in the fall or too early in the spring. I don't sell it except to the most avid and diligent collectors. Above: The original seedling of adenium 'Beautiful Mule', 17 years old in an 18-inch pot. Far left: a new flower of adenium 'Beautiful Mule', showing excellent shape. Left: week-old flowers, showing how the petals elongate as the flower ages. The right photo shows more accurate color - crimson-red. Back to Menu Above: A grafted plant of adenium 'Bohemian Splash', about 7 years old. The original seedling is slow-growing. 'Bohemian Splash' (MAD639) Parentage: Complex hybrid involving Adenium boehmianum, "obesum", and crispum . A. boehmianum 'MAD193' x 'Happy Princess' Creator: Dimmitt 2010 Plant form: Vigorous (on grafts) upright shrub or tree with sturdy branches; tends to grow taller than wide. Deciduous. Flower: Round, 60 mm diameter x 26 mm petal width. Petals pink with many fine dark pink lines almost to the tips. Throat pinkish-red with prominent black nectar guides. Blooms prolifically from early summer to early winter. High flower count. Notes: This is my favorite boehmianum hybrid, because of its strong growth and profusion of colorful flowers. The great majority of boehmianum hybrids are weak and/or are very slow growing. They produce mostly inferior offspring in subsequent generations. Back to Menu Above: The flowers of adenium 'Bohemian Splash'. Left: A young grafted plant of adenium 'Bohemian Splash', about 2 years old. 'Candy Stripes' Parentage: Label lost; presumably Adenium crispum x swazicum . When this cross was made, the most likely parents were A. crispum 'Famous Ancestor' and A. swazicum 'Perpetual Pink' Creator: Dimmitt 2000 Plant form: Erect, arborescent, with large roots and thick main stems. Deciduous. Flower: Semi-star, 80 mm diameter x 27 mm petal width. Petals dark pink with 3 fine dark pink lines to the tips and numerous short streaks. Flowers age to light pink. Throat red with darker red nectar guides. Blooms prolifically during the warm months. Notes: The dark throat and short anther appendages indicate swazicum parentage (if it were boehmianum , it should contribute larger leaves); while the petal markings have to come from crispum. Neither species is known for having sturdy stems, so this erect plant is a treasure. This clone grows well from cuttings. I know of no other crispum-swazicum hybrids. Above: A new (left) and old flower of 'Candy Stripes'. Above: The original seedling of adenium 'Candy Stripes', 9 years old in a 24-inch box. Right: This hybrid of A. crispum x A. swazicum by JFR Exotics supports my conclusion about the parentage of 'Candy Stripes'. Photo: John Franklin Roosevelt. Back to Menu 'Crimson Picotee' Parentage: Primary hybrid between A. "obesum " and A. multiflorum . Creator: Dimmitt 1984 Plant form: Very large, erect shrub with thick, sturdy main branches and massive roots. Evergreen. Flower: Round-star, 70 mm diameter x 27 mm petal width. Petals white with broad bright red border. Throat white with few prominent nectar guides. Blooms sparsely but almost continuously year-round. Notes: I've made several "obesum"-multiflorum hybrids, but this was the only one worth keeping. The others were less vigorous, and flowered even more sparsely. Grows well from cuttings and makes a good grafting rootstock. Back to Menu Above: The original seedling of adenium 'Crimson Picotee', 10 feet tall in a 36-inch pot at 16 years old. Left two: the flowers of 'Crimson Picotee'. 'Flame Tree' Parentage: Complex hybrid of A. "obesum", swazicum, and somalense. ('Crimson Star' x A. somalense ) Creator: Dimmitt 1995 Plant form: Tree to at least 10 feet tall in 10 years, with thick cylindrical trunk. Roots not greatly swollen. Flower: Round/semi-star, 55 mm diameter x 20 mm petal width. Petals deep red, fading to near-white at the throat. Throat blackish-red with black nectar guides that extend halfway to petal tips as red lines. Notes: I have made only a few crosses with somalense, because I didn't have any good clones of the species until very recently. Such hybrids have little value as commercial pot plants because they get so big so fast. But they would make great landscape plants in tropical climates. I list this cultivar because I know of no similar hybrids. It also shows that somalense can contribute petal markings to hybrids. Do you have any somalense hybrids? Please contribute to our knowledge. Above left: The original seedling of adenium 'Flame Tree', 8 feet tall at 9 years old. Above right: The same plant at 17 years old, 10 feet tall in a 22-inch pot. Back to Menu Above: A 4-year-old cutting of adenium 'Singapore', already showing its conical caudex. 'Singapore' Parentage : Uncertain; possibly this is Adenium coetanum . See notes below. Origin: Introduced by the Singapore Botanical Garden in 1933. My plant is a cutting of Frank Horwood's clone from Abbey Garden. Plant form: Spreading shrub with conical caudex and swollen main stems. Evergreen. Flower: Very large, semi-star, 102 mm diameter x 30 mm petal width. Petals light pink with wide deep pink to light red margin. Throat white with few faint nectar guides. Blooms repeatedly during the warm months. Notes: This is the oldest named cultivar of adenium, dating to a time decades before adeniums became well known in horticulture. Albert Chan at the Singapore Botanic Garden showed the plant to the famous botanist Richard Eric Holttum. He identified the plant as A. coetanum , a taxon of questionable validity. There are a few herbarium specimens with this label that were collected from northern Uganda and Kenya south to northern Tanzania. Adeniums from this region are currently recognized as A. somalense in the north and A. "obesum " in the south. DNA analysis suggests that 'Singapore' is an obesum-somalense intergrade. Therefore it is probable, whatever its true identity is, that it originated in this region of East Africa. Frank Horwood succeeded in selfing his plant and obtained a handful of seedlings, which were fertile. All of the plants in the US labeled A. coetanum are probably descended from this one clone. Source: a 1980 letter from Frank Horwood . Above: The 4-inch flower of adenium 'Singapore'. Back to Menu Above: A 12-year-old cutting of adenium 'Singapore. 'Winter Remedy' Parentage: Adenium multiflorum x swazicum primary hybrid. (A. multiflorum 'MAD1' x A. swazicum 'Perpetual Pink' Creator: Dimmitt 1987. Plant form: Spreading shrub with massive roots. Semi-deciduous. Flower: Round/semi-star, 77 mm diameter x 27 mm petal width. Petals with wide medium pink margin, fading to near-white at throat. Throat red with no nectar guides. Flowers fade to light pink in a week. Inflorescence is indeterminate, produces buds and flowers for about 3 months. Winter blooming. Notes: This is one of a small number of winter-blooming adeniums. Above left: The flower of adenium 'Winter Remedy'. Above right: A 3-month old indeterminate inflorescense. The first flower was where my two fingers are gripping the peduncle. Back to Menu Above: The original seedling of adenium 'Winter Remedy' at 16 years old in a 24-inch pot. Cuttings grow the same massive roots in several years.

Adenium crispum x "obesum" hybrids This hybrid line was a huge breakthrough in adenium breeding. There were a few such crosses in the early 1990s in California and possibly elsewhere, but even though the F1 plants had the petal markings of crispum, the usually small, twisted flowers didn’t inspire much enthusiasm. In 1999 I sent a cutting of A. crispum to a collector in Taiwan (I later named it ‘Famous Ancestor’ . He propagated it and shared it with other growers. This species is difficult in hot, humid climates. The clone died out within a couple of years, but not before hybrids were made with A. “obesum”. First generation (F 1 ) hybrids inherit from "obesum" vigorous vegetative growth and large, colorful flowers. The crispum parent often contributes a substantial caudex, and quilled flowers with strong nectar guides that extend to the petal tips. Unfortunately, both parents tend to contribute weak stems. Plants of this line are usually slow-growing, taking at least 5 years to develop their character (in Arizona; they grow much faster in more tropical climates). After several generations the Taiwanese breeders had eliminated the quilled petals and created plants with large flat flowers exhibiting bold petal markings. The nectar guides on the petals often morph into bold blotches and stripes. All flowers with such petal markings are descended from A. crispum , and probably from 'Famous Ancestor'. By 2008 there were millions of plants and hundreds of stunning named cultivars all over Asia. The plants in this group are mostly small to medium-sized and slow-growing, with modest caudexes (about 2 feet [61 cm] tall and wide); but some are “obesum” -sized (3 to 4 feet [91-122 cm]). Only the best clones have sturdy stems; most need pruning every few years to maintain a neat form. Superior clones flower profusely throughout the warm season. Both parent species are very cold-sensitive, but many of the complex hybrids (second generation and beyond) are resilient as long as they’re kept dry during winter. Almost all cultivars on the market are grafted. See the superior cultivars page for a big gallery of these hybrids. Adenium ' Harry Potter ' was the first crispum-"obesum " hybrid with fairly flat petals and bold markings. The nectar guides have become blotchy stripes. It was created in Taiwan by C.F. Chang in 2003, only 4 years after the introduction of A. crispum . A first-day flower is at left; a week-old flower at right. A few more early crispum-"obesum " cultivars. Left: Adenium 'City' from Taiwan is an example of a flower with strong contrast between the background and the nectar guides. Below: New and older flowers of 'Star of Taiwan' Below: 'Classical' has bold blotches overlain by even bolder lines. Created by H.C. Chen. Footnotes