Prickly yellow
Zanthoxylum caribaeum · Rutaceae
📷 Filo gèn' · CC BY-SA 4.0
The gardener's calendar
Ideal time to plant prickly yellow: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Common name
- Caribbean Pepper Tree, Clavalier
- Family
- Rutaceae
- Form
- Shrub
- Foliage
- Deciduous to semi-evergreen
- Flowering
- Spring (discrete yellowish-green flowers)
- Mature size
- 3 to 5 m in height
- Growth rate
- Moderate to fast
- Hardiness
- Frost-sensitive (from 0 °C)
- Origin
- Caribbean and tropical regions of America
Care
Exposure
Place your Zanthoxylum caribaeum in full sun or partial shade for balanced development. Direct exposure promotes more abundant flowering and denser foliage. In cold climates, prefer a location sheltered from wind and frost.
Watering
Water regularly during the growing season (spring-summer) while keeping the substrate moist without waterlogging. Reduce watering in fall-winter, especially if the plant loses its leaves. Adjust frequency based on temperature and ambient humidity.
Soil
Choose well-draining, fertile soil that is slightly acidic to neutral. A substrate rich in organic matter will encourage growth. Avoid heavy or compacted soil that causes root asphyxiation.
Fertilizer
Apply balanced fertilizer every three to four weeks during the active growing period (spring-summer). Reduce or stop applications in fall-winter. A fertilizer slightly enriched in potassium supports flowering.
Pruning and maintenance
Prune lightly after flowering to control the shape and remove dead or misplaced branches. The shrub tolerates pruning well and can be formed into a compact bush. Regularly remove dead foliage at the base.
Diseases and pests
In humid and confined environments, watch for scale insects and spider mites. Good drainage and adequate air circulation prevent most fungal issues. Inspect leaves regularly and treat early if needed.
Did you know?
Zanthoxylum caribaeum, like its Asian cousins, possesses aromatic glands on its leaves and bark that release a characteristic spicy fragrance when crushed. This shrub is traditionally used in Caribbean pharmacopeias for its properties, although few modern scientific studies support this. Its name 'Zanthoxylum' literally means 'yellow wood' in Greek, referring to the heartwood color in certain species of the genus.
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.
Add this plant to my garden →Plants from the same family
- Lemon treeCitrus limon
- Orange treeCitrus sinensis
- Seville orangeCitrus aurantium
- Northern prickly ashZanthoxylum americanum
- Mastic-leaf prickly ashZanthoxylum schinifolium
- Amur Cork TreePhellodendron amurense
Tips generated and checked by Viridia — adapt them to your local climate.