Aeonium arboreum

Aeonium arboreum
Scientific Name: Aeonium arboreum (L.) Webb & Berthel.
Synonym: Aeonium korneliuslemsii
Family: Crassulaceae

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"Aeonium arboreum" from a local nursery Recommended Temperature Zone:
sunset: 15-17, 20-24
USDA: 9b-11

Frost Tolerance: Hardy to 25°F (-4°C)
Minimum Avg. Temperature: 50°F (10°C)
Heat Tolerance: Light shade necessary in the low deserts
Sun Exposure: Light shade to full sun
Origin: Atlantic coast of Morocco
Growth Habits: Bushy succulent, up to 3 feet tall (90 cm), 6-8 inches (15-20 cm) rosettes at the end of stems
Watering Needs: Infrequent deep watering
Propagation: Cuttings, seeds

Most of the plants sold in nurseries as "Aeonium arboreum" are probably hybrids, different from the few Moroccan populations left, for which Aeonium korneliuslemsii is probably the valid name.
The commonly found "Aeonium arboreum" are fairly heat resistant and will take a good amount of sun even in Phoenix's extreme heat.

Aeonium arboreum at Holly Gate Nursery, Photo Terry Hewitt

Blooming Habits:
Mature rosettes bear an 8 inches tall (15 cm) inflorescence of cream to yellowish flowers in late winter. The branch that has bloomed then dies.

References:
Botanica : The Illustrated A-Z of over 10,000 Garden Plants

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