Blackthorn

Blackthorn is a small, thorny deciduous tree with dark green leaves, white early-spring flowers, and small blue-black sloe fruits. The Royal Horticultural Society records several common names, including sloe, bullace, and sloe plum. ## Site and growth The [RHS plant profile](https://www.rhs.org.uk/plants/14041/prunus-spinosa/details) describes Prunus spinosa as a bushy tree that can sucker outward and form a thicket. It grows in full sun and moist but well-drained soil, tolerates chalk, clay, loam, or sandy ground, and is listed at 2.5–4 metres high and wide. Its thorny branches make it useful for a screen or wildlife hedge, while the spring flowers and dark fruits also give it seasonal interest. The RHS notes that seed kernels are harmful if eaten. ## Maintenance Check the base and surrounding ground for suckers; remove them unless a dense hedge is wanted. Wear sturdy gloves when handling thorny branches, keep the plant clear of paths, and prune in midsummer if silver leaf is a problem. Monitor for aphids, caterpillars, and blossom wilt as noted by the RHS.