Spanish broom

For Spanish broom, water deeply once a week during the summer months. If the plant experiences extended hot and dry weather, water twice a week. During cooler months, water every 2 or 3 weeks. Soak the plant's root zone with enough water to moisten the soil 6 to 8 inches deep. Spanish broom is a relatively drought-tolerant plant and overwatering can cause root rot.

Spanish broom (Spartium junceum) grows best in areas that receive full sun, but can tolerate some shade. It should ideally receive 6–8 hours of direct sunlight each day. It will tolerate some temperature fluctuations, but it does best when temperatures remain in the range of 60°F-80°F. During extended periods of heat, it should receive some afternoon shade to prevent stresses on the plant.

Spanish broom should be pruned annually, during the late summer or early fall months. Pruning should be fairly extensive, removing up to 1-third of the entire plant. Remove any dead or diseased branches and thin out dense areas to improve air circulation. If the plant is overgrown and old, drastic pruning can be done to rejuvenate it, removing up to 2-thirds of the plant's material. All pruning cuts should be made just above a healthy bud or branch collar. Following pruning, Spanish broom should be fertilized lightly to encourage new growth.