Planting and Caring for Walnut Trees

Walnut trees are a long-term project. A healthy tree can produce nuts for generations, but it needs the right site and plenty of room.

Space and site

Walnuts grow large. Give them at least 10–15 metres of clear space from buildings, paths and other trees. Choose a sunny, sheltered site with deep, well-drained soil. Avoid frost pockets, which can damage early growth.

Soil preparation

Walnuts prefer fertile loam with a pH around 6.0–7.5. Improve poor soil with compost and ensure drainage. They dislike waterlogging but need consistent moisture while establishing.

Planting

Plant bare-root trees in dormant season. Dig a generous hole, position the tree at the same depth as in the nursery, backfill and water thoroughly. Stake if the site is exposed. Mulch well, keeping mulch away from the trunk.

Water and feed

Water regularly for the first two or three years, especially in dry summers. Once established, walnuts are relatively drought tolerant but benefit from watering in prolonged dry spells. Feed lightly with compost in spring.

Juglone awareness

Walnut roots and leaves contain juglone, which can inhibit some plants. Keep sensitive species away from the root zone and compost leaves separately. Many grasses and some perennials tolerate it.

Patience

Seedling walnuts can take many years to produce. Grafted varieties fruit sooner. Even so, expect to wait several years for a meaningful harvest. Plant for the next generation as much as for yourself.