Aeonium decorum Webb ex Bolle
Decorative aeonium
Aeonium decorum is a shrubby succulent endemic to Tenerife and La Gomera, distributed mainly in the lower thermomediterranean zone between 100 and 800 m elevation, on cliffs, slopes, and roadsides. Its branched stems, up to 60 cm tall, terminate in flat rosettes of bright green leaves with finely toothed, reddish ciliate margins, giving it great ornamental value. Like all Aeonium, it is a winter grower: active from October to May and in summer dormancy between June and September. Unlike many relatives, A. decorum is relatively tolerant of partial shade, making it very versatile in Mediterranean gardening. Selected cultivars such as A. decorum 'Tricolor' are widely used in horticulture.
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Overview
| Category | Classification |
|---|---|
| Family | Crassulaceae |
| Genus | Aeonium |
| Growth Habit | Shrubby succulent with branched stems 30–60 cm; flat rosettes 8–15 cm in diameter; densely branched |
| Conservation Status | Least Concern (LC) — IUCN: wide distribution across Tenerife and La Gomera with numerous populations; no immediate critical threats |
| pH Target | 6.0–7.5 |
| Type | Well-draining volcanic-mineral; tolerates moderately organic soils |
Origin & Habitat
Morphology
Spatulate to oblanceolate leaves, 3–6 cm long, bright to medium green with denticulate, reddish to yellowish ciliate margins. Leaves have a waxy coating that gives them a slight lustre.
ecoWhite to pink flowers gathered in conical panicles 10–20 cm in diameter; each flower with 9–11 linear petals 5–8 mm long. Flowering occurs between February and May; rosettes that flower die after fruiting.
ecoErect to sub-erect, circular-section stems, woody at the base, 30–60 cm, with abundant branching and regularly arranged leaf scars. The stem readily produces spontaneous lateral branches, giving it a dense shrubby appearance.
ecoFibrous root system of moderate depth, efficient in thin volcanic soils. Roots tolerate some drought when the plant is in summer dormancy.
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Requirements
Soil & Substrate
Type
Well-draining volcanic-mineral; tolerates moderately organic soils
groups Beneficial Associations
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Propagation Strategy
- 1 Cut a stem with rosette 6–10 cm using sterilized knife or scissors.
- 2 Remove lower leaves leaving 2–4 cm of bare stem.
- 3 Allow the cut to dry 24–48 hours in a cool, well-ventilated place.
- 4 Insert into slightly moist mineral substrate (perlite + coarse sand).
- 5 Maintain at 15–20 °C; first water after 5–7 days then weekly.
- 6 Roots form in 2–4 weeks; transplant to final substrate.
- 1 Sow on surface without covering on moist sandy substrate.
- 2 Maintain at 18–22 °C with bright indirect light and high ambient humidity.
- 3 Germinates in 14–28 days; reduce humidity after germination to prevent damping-off.
- 4 Transplant when rosettes are 1.5–2 cm wide.
One of the easiest species in the genus: ideal for beginners to Aeonium cultivation.
Watering during summer dormancy: the most common mistake. In summer, the plant should be in dry substrate.
Every 2–3 years in September-October at the start of the growth period
Once or twice during the growth period (October and January), balanced low-nitrogen fertilizer (5-10-10 or 7-14-14); do not fertilize in summer
Uses & Applications
Precautions / Toxicity
No known toxicity reported for humans or domestic animals.
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Plant Health
Root rot (Phytophthora spp., Pythium spp.): high risk if watering is not completely stopped in summer. Initial symptom is softening of the plant crown at substrate level.
Mealybug (Planococcus citri, Pseudococcus longispinus): concentrates at the rosette crown and on the underside of leaves. Preventive control with neem oil; treatment with imidacloprid in severe infestations.
Slugs and snails: can damage young leaves in the centre of the rosette, especially in outdoor cultivation in humid climates. Use metaldehyde baits or copper barriers.
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"Aeonium decorum was described by Webb & Bolle in 1860 from material collected in Tenerife. It is one of the most ecologically plastic species in the genus and has generated the greatest number of horticultural cultivars, notably A. decorum 'Tricolor' (leaves with green, cream, and rose-red bands) and A. decorum 'Sunburst' (cream-yellow margin). The species naturally hybridises with A. haworthii in contact zones on Tenerife, producing intermediate populations that are difficult to identify. The Jardín Botánico Canario Viera y Clavijo (Gran Canaria) preserves accessions from historical collections of the species."
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Scientific Integrity
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Discussion
Disclaimer
This species record is provided for educational and informational purposes only. Jardín Roca Negra does not guarantee the accuracy or completeness of the data. Content is community-curated and may be subject to revision; it should not replace advice from a qualified botanist. This species may be toxic, invasive, or subject to legal restrictions — verify before handling or cultivating. Jardín Roca Negra accepts no liability for any harm arising from reliance on this information. Images are reproduced under Creative Commons or equivalent free licenses; credits are noted below each image.