Aeonium (Aeonium arboreum subsp. holochrysum) in the Aeoniums Database

Botanical names:
Aeonium arboreum subsp. holochrysum Accepted
Aeonium holochrysum Synonym

General Plant Information (Edit)
Plant Habit: Cactus/Succulent
Life cycle: Perennial
Sun Requirements: Full Sun to Partial Shade
Soil pH Preferences: Moderately acid (5.6 – 6.0)
Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Minimum cold hardiness: Zone 9b -3.9 °C (25 °F) to -1.1 °C (30 °F)
Leaves: Evergreen
Flowers: Showy
Flower Color: Yellow
Bloom Size: Under 1"
Suitable Locations: Xeriscapic
Uses: Provides winter interest
Wildlife Attractant: Bees
Resistances: Drought tolerant
Containers: Needs excellent drainage in pots

credit: Keith Edkins

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Comments:
Posted by Baja_Costero (Baja California - Zone 11b) on Jan 29, 2019 7:27 PM

Yellow-flowered Aeonium from the Canary Islands (Tenerife, Gran Canaria, La Palma, Gomera, Hierro). Rosettes 4-6 inches. Upright stems. The most common Aeonium in cultivation and the most widespread in the Canaries. Frequently misidentified and the parent of many hybrids, both green and red/purple.

The Canary Island subspecies Aeonium arboreum subsp. arboreum and Aeonium (Aeonium arboreum subsp. holochrysum) can often be distinguished by the color of the leaves (darker or greener) and the shape of the rosette (cup-shaped or flat) according to Schulz. This is complicated somewhat by seasonal changes and the effects of light, and not an absolute rule. They can also be distinguished in a more definitive way based on having fuzzy flowers and stalks (arboreum), or not (holochrysum). The Moroccan subspecies Aeonium arboreum subsp. korneliuslemsii can be distinguished based on its hairy leaves, which are rounded and usually lack a point, and broader elliptical petals.
According to Schulz: very few plants in cultivation are from known habitat locations. Also according to Schulz, all of the purple or blackish-leafed Aeonium cultivars (like "Zwartkop" and its offspring) are forms or hybrids of arboreum.

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