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| Category: Succulent |
| Family: Crassulaceae (Stonecrops) |
| Origin: Canary Islands (Atlantic Ocean) |
| Evergreen: Yes |
| Red/Purple Foliage: Yes |
| Flower Color: Yellow |
| Bloomtime: Summer |
| Synonyms: [A. manriqueorum 'Schwartzkopf', 'Schwartzkopf'] |
| Height: 3-4 feet |
| Width: 1-2 feet |
| Exposure: Cool Sun/Light Shade |
| Seaside: Yes |
| Summer Dry: Yes |
| Deer Tolerant: Yes |
| Irrigation (H2O Info): Low Water Needs |
| Winter Hardiness: 25-30° F |
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Aeonium arboreum 'Zwartkop' (Large Purple Aeonium) - A striking succulent which forms clumps of 3-4 foot tall gray-brown stems that often branch near their base but not above. The long, bare stems hold large terminal rosettes of very dark purple (seemingly black) leaves. Yellow star-shaped flowers that contrast well against the dark foliage form in long conical clusters from the center of the rosettes of mature older plants in summer, after which the stems bearing the flower die to the ground. Plant in a well-drained soil in full sun near the coast to partial shade inland. Water deeply but infrequently - this is a winter growing species that is semi-dormant in summer and early fall when foliage is at its darkest. Protect from frost as stems will freeze at around 28° F. This plant is great along the ocean and tolerates drought and is reportedly resistant to deer predation. Aeonium arborescens is native to Gran Carnaria Island in the Canary Islands. We have long grown this plant as 'Zwartkop' as this was the name we received the plant by and the name used in the Abbey Gardens catalogs in the early 1980's. There is some disagreement on this name, mostly due to whether the Dutch name 'Zwartkop', meaning "black head" or the German name 'Schwartzkopf' (or alternatively 'Schwarzkopf') with the same meaning is correct. The story varies whether this plant originated in Holland and was originally named there. This is the story that is portrayed in "Dry Climate Gardening with Succulents" edited by Huntington Botanic Garden Director James Folsom but in an article on the Ruth Bancroft Garden website describing this plant, Dr. Dean Kelch, Garden Director at the Ruth Bancroft Garden (and noted Aeonium expert) uses the name 'Schwartzkopf' and relates that this plant was a seedling raised in Europe and that the UC Berkeley Botanic Garden was the first institution to obtain plants in the US. Dr. Kelch also notes that many dark forms of Aeonium arboreum in nurseries are mislabeled as 'Schwartzkopf'. Further confusion surrounds the parentage of this plant; this plant is sometimes described as a cultivar of Aeonium manriqueorum but this name has been included in with A. arboreum in Dr. Reto Nyffeler's treatment of the genus as published in "Illustrated Handbook of Succulent Plants: Crassulaceae" edited by Urs Eggli, Springer, 2003. The cultivar received the Royal Horticultural Society's Award of Garden Merit in 1993
The information on this page is based on research conducted about this plant in the San Marcos Growers library, from online sources, and from observations made of the crops growing in our nursery, plants in the nursery's garden and those in other gardens where we may have observed it. We also have incorporated comments received from others and welcome getting feedback from those who may have additional information, particularly if this information includes cultural information that would aid others in growing Aeonium arboreum 'Zwartkop'. |
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