Chamise
Adenostoma fasciculatum · Rosaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around chamise and prepare for winter.
ID card
- English name
- Chamiso
- Foliage
- Evergreen, fine and fasciculate
- Flowering
- April to June, white flowers in spikes
- Adult size
- 1.5 to 3 m in height
- Growth
- Fast to moderate
- Hardiness
- Zones 9-10 (light frosts tolerated)
- Origin
- California, Mediterranean scrubland
- Soil type
- Well-draining, poor, drought-tolerant
Care
Sun Exposure
Prioritize full sun for optimal growth and generous flowering. Adenostoma fasciculatum tolerates hot, arid exposures characteristic of its natural habitat. Avoid shaded areas which would slow its vigor.
Watering
Once established, this shrub is very drought-tolerant and requires regular watering only during the first year. Reduce watering from the second year onward: excess moisture promotes root rot. In dry climates, a few summer waterings are sufficient.
Soil
Prefer well-draining, poor to average soil, slightly acidic to neutral. Chamiso also adapts well to rocky and stony terrain typical of the California chaparral. Avoid compact or constantly wet soils.
Pruning and Cutting
Prune after flowering (June-July) to maintain a compact form. Light interventions encourage branching; heavy pruning can weaken the plant. Chamiso regenerates naturally well and tolerates severe pruning if necessary.
Fertilizer
No fertilizer is needed in appropriate soil. The species is adapted to poor soils and responds poorly to excessive fertilization. Light mineral application in spring may suffice if visible deficiencies appear.
Diseases and Pests
Adenostoma fasciculatum is robust and little affected by common pests. In overly humid conditions, watch for root fungal rot. Maintain good air circulation and optimal drainage to prevent problems.
Watering
Adenostoma fasciculatum is highly xerophytic and requires minimal watering maintenance. Keep soil moderately moist for the first three months after planting, then gradually reduce. Once established, only the first hot year requires supplemental watering.
Did you know?
Adenostoma fasciculatum, called 'chamiso' or 'greasewood,' plays a crucial ecological role in California scrubland fires: its volatile oils allow it to burn easily and its deep roots enable rapid recovery after fires. This species is thus an important pioneer in chaparral regeneration, and it has fascinated ecologists for its remarkable survival strategy in response to fire disturbance.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.