Black Alder

A fast-growing, native deciduous tree, commonly found in wet areas, growing to 15-20m with a conical to rounded crown. Notable for its distinctive sticky (glutinous) young shoots and leaves. In late winter to early spring, it produces attractive yellow male catkins and small, red female catkins, followed by small woody 'cones' that persist through winter. Hardy to H7, it thrives in full sun to partial shade and is exceptionally tolerant of wet and boggy soils. An important tree for wildlife, supporting various insects and birds. Used in riparian planting and for improving poor soils due to its nitrogen-fixing capabilities.

Sun: Full sun to partial shade.

Soil: Wet to moist.

Hardiness: H7 — below −20°C.

Flowering: Feb, Mar.