Caring for Eucalyptus

Water eucalyptus moderately during the growing season, allowing the top few centimetres of compost to dry out between waterings. In hot summer weather, container-grown plants may need watering two or three times a week; check regularly by feeling the compost. Overwatering is a common mistake—eucalyptus prefers slightly dry conditions to constantly moist soil. In autumn, reduce watering frequency as growth slows. Feed in April and again in June with a balanced liquid fertiliser or a slow-release granular feed designed for shrubs. Avoid high-nitrogen feeds, which promote soft, sappy growth vulnerable to frost and pests. A controlled-release fertiliser applied in spring will support steady growth through summer without the need for frequent feeding. Overwintering is critical. Before the first frosts in October or November, move your eucalyptus into a frost-free greenhouse, conservatory, or bright porch where temperatures stay above freezing but ideally remain cool (3–10°C). A cold but frost-free environment encourages dormancy and prevents leggy growth. Water sparingly over winter—just enough to prevent the compost drying out completely. Return the plant outdoors in late April or May, once frosts have finished, hardening it off gradually over a week or two. Eucalyptus gunnii is generally pest- and disease-free, but watch for silver leaf fungus (prune out affected branches promptly) and occasional eucalyptus gall wasp, which causes lumpy growths on stems; prune out and destroy infested material. In very dry conditions, red spider mite may appear; mist the foliage occasionally to deter them. Refresh the top layer of compost annually and repot every two to three years in spring to prevent the plant becoming root-bound.