A period of minimal metabolic activity and growth in a plant, typically triggered by cold temperatures or drought. Allows plants to survive unfavourable conditions. Deciduous trees are dormant in winter.
Dormancy is a natural survival mechanism where plants essentially enter a state of suspended growth. During this period, visible growth stops, leaves may drop, and the plant uses minimal water and nutrients. In Australia's temperate zones (like Tasmania and Victoria), dormancy typically occurs during winter months when daylight decreases and temperatures drop. However, in warmer climates and during drought conditions, Australian native plants often enter dormancy to conserve water rather than in response to cold.
Understanding dormancy is crucial for Australian gardeners because it affects when you should prune, fertilise, and water plants. Deciduous fruit trees like apples and pears require winter dormancy in cooler zones to set fruit successfully. During dormancy, you can safely prune without stressing the plant, and you should reduce watering significantly. Many Australian natives like banksias and bottlebrushes have built-in dormancy cycles tied to seasonal rainfall patterns.
Breaking dormancy happens naturally when conditions improve—longer spring days (September onwards), warming temperatures, and increased rainfall trigger plants to resume growth. You can sometimes force dormancy-breaking indoors by chilling seeds in the refrigerator, which mimics winter conditions. At Bunnings, you'll find dormant-season products like pruning sealers and winter fertilisers designed for this period. Never fertilise dormant plants, as this encourages growth when the plant needs rest.