When to plant Sweet Gum?

Sweet gum thrives in full sun and tolerates a wide range of soil types, including loam, clay, and peat-based soils. Choose a spacious site: mature trees reach 10–25 metres tall with a spread of 6–12 metres, so plant at least 8 metres from buildings, boundaries, and other large trees. Avoid shallow chalk soils, which can cause chlorosis. Plant bare-root or container-grown trees in October, November, or March when the soil is workable and not frozen. Autumn planting is often preferable, allowing roots to establish before spring growth. Dig a hole twice the width of the root ball but no deeper; the root flare should sit level with the surrounding soil surface. Break up compacted soil at the base and sides of the hole to encourage root spread. If your soil is heavy clay, fork in some organic matter to improve drainage, though sweet gum tolerates clay well once established. Position the tree upright, backfill with the excavated soil, and firm gently with your heel to eliminate air pockets. Water thoroughly—at least 20 litres—to settle the roots. Apply a 7–10 cm layer of organic mulch (bark chips or well-rotted compost) around the base, keeping it clear of the trunk to prevent rot. Stake young trees with a single angled stake and a flexible tree tie if the site is exposed or the root ball small; check and loosen the tie every few months as the trunk expands. Water weekly during the first growing season if rainfall is sparse.