French lavender, Butterfly lavender, Topped lavender, Spanish spike lavender
Lavandula stoechas, commonly called Spanish or French lavender, is an evergreen Mediterranean subshrub prized for its distinctive pinecone-like flower heads topped with showy, petal-like bracts that resemble butterfly wings. Typically 30–60 cm tall, it has narrow, gray-green, aromatic foliage covered in fine hairs that reduce water loss and reflect intense sunlight. Blooming mainly in spring to early summer, it attracts bees and other pollinators with its resinous, camphoraceous scent. Unlike English lavender, L. stoechas is less cold-hardy but excels in hot, dry conditions with excellent drainage. In nature it inhabits poor, sandy or rocky, often acidic soils, thriving where competition is low and air movement is high. Gardeners value it for compact growth, long flowering in mild climates, and suitability for containers, coastal gardens, and xeriscapes. It responds well to light, timely pruning but resents heavy feeding or wet feet. Indoors, it requires maximum sun, lean, sharply drained media, and restrained watering to avoid root and stem rots.
Allow the soil to dry well between waterings. Outdoors, water deeply and infrequently once established, then wait until the top 5–7 cm are dry before watering again. In containers, use a free-draining mix and water only when the pot is light and the top half of the medium is dry; empty saucers immediately. Reduce watering markedly in winter, especially in cool conditions. Avoid constant moisture and overhead irrigation, which promote root and stem rots. Consistency with thorough drying cycles is key.
Provide full sun: at least 6–8 hours of direct light daily. Outdoors, choose an open, unshaded site with steady airflow. Indoors, place in the brightest south- or west-facing window, or supplement with grow lights delivering 15,000–30,000 lux for 12–14 hours. Insufficient light leads to lanky growth and poor flowering. Avoid deep shade and reflected heat pockets that trap humidity. Rotate pots periodically for even growth and keep nearby vegetation pruned back to maintain sun and air circulation.
Feed sparingly. Spanish lavender is adapted to lean, mineral soils and excessive fertilizer encourages weak, lush growth and fewer flowers. In ground, mix in coarse grit and a small amount of mature compost only once at planting. For containers, use a low-nitrogen, balanced fertilizer at 1/4–1/2 strength once in early spring, then stop. Avoid high-nitrogen feeds and lime-heavy amendments; this species prefers slightly acidic to neutral conditions. A light potash boost after the first flush can support rebloom without soft growth.
Best in mild, dry climates. Optimal growth occurs around 18–27°C by day with cooler nights. It is less hardy than English lavender, tolerating only light frost; damage often occurs below about −5°C. Grow as a perennial in USDA zones 8–10, or as a container plant elsewhere to move under cover during freezes and prolonged winter wet. Protect from heat extremes above 35°C with airflow and mulch of grit rather than organic materials, and keep roots dry in cold weather.
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