Why Is My Lemon Tree Shrivelling from Drought?

Citrus trees are more drought-tolerant than many people assume, but prolonged underwatering — particularly in summer heat or in small containers — causes rapid deterioration. Leaves become dry and papery, young shoots wilt and curl, developing fruits shrivel and drop prematurely, and in severe cases the whole tree can defoliate within days. Unlike overwatering, drought stress in citrus can often be reversed quickly if caught in time and addressed correctly.

Signs of underwatering

An underwatered lemon tree shows leaves that are pale, slightly limp, and beginning to curl. The leaf surface often feels slightly dry and papery rather than glossy and firm. The compost or soil in the pot will be bone dry when you push a finger in, and if you lift the pot it will feel surprisingly light. Developing fruits may start to shrivel at the stalk end. In severe drought, the tree will drop leaves rapidly — sometimes almost overnight — leaving a stripped-looking plant with dry, crisp leaves on the ground around it.

How to water a severely dry citrus tree

If the compost has dried out completely in a container, it may have become hydrophobic — water will run straight through without being absorbed by the dry compost. To rehydrate thoroughly, stand the pot in a bucket of water deep enough to come halfway up the sides and leave it for thirty to sixty minutes, allowing the compost to absorb water from below. Then water from the top as well. The tree should begin to recover within a day or two as the leaves rehydrate and firm up.

Watering frequency in summer

In summer heat, container citrus may need watering every two to three days or even daily in very hot weather. Check the compost daily by pushing a finger 3–4 cm into the surface — water when the top layer is dry but there is still some moisture below. Never let the compost dry out completely. Outdoor potted citrus in full sun during a heat wave can desiccate very rapidly, especially in terracotta pots which lose moisture through the pot walls. Moving pots to a slightly shadier position during extreme heat reduces water demand.

Improving water retention in containers

If a citrus tree in a container repeatedly dries out too quickly, the compost may have become exhausted and water-repellent after years of use. Repot into fresh citrus compost mixed with a water-retaining granule product — these absorb and slowly release water over time. Adding a mulch layer of bark chippings over the compost surface also reduces surface evaporation significantly. For garden-grown citrus, a deep mulch of organic matter around the root zone performs the same function.

Recovering from drought damage

After severe drought, a citrus tree may drop most of its leaves. Do not give up — the tree can often recover from this if the stems are still green and flexible. Water carefully and keep the tree in a warm, bright position. Avoid fertilising immediately after severe stress as this can further damage weakened roots. Feed lightly with a dilute liquid fertiliser once new growth begins to appear, which may be several weeks after rehydration.