Erica arborea requires consistent moisture, especially during its establishment phase and prolonged dry spells. Water deeply when the top few centimeters of soil feel dry, but avoid waterlogging, which can lead to root rot. Reduce watering slightly in cooler, dormant periods, ensuring the soil never completely dries out.

Prune Erica arborea immediately after its flowering period, typically in late spring or early summer. This encourages a dense, bushy habit and removes spent flowers. Lightly trim back the flowered shoots by about one-third, shaping the plant as desired. Avoid cutting into old, woody stems, as these may not readily regrow. Remove any dead, diseased, or crossing branches to maintain plant health.

Propagate Erica arborea effectively from semi-ripe cuttings taken in late summer or early autumn. Select healthy, non-flowering shoots about 5-10 cm long. Remove the lower leaves and dip the cut end in rooting hormone before planting into a well-drained mix of peat and sand. Keep the cuttings in a warm, humid environment, ensuring consistent moisture until roots develop. Seeds can also be sown in spring.

Erica arborea is best grown in the ground due to its potential size. If cultivated in a container when young, repotting is necessary only when the plant becomes root-bound, typically every 2-3 years. Choose a pot only slightly larger than the previous one and use a fresh, acidic, well-draining potting mix. Handle the root ball gently to minimize disturbance. Ensure adequate drainage to prevent waterlogging and root issues.