Amelanchier lamarckii, the snowy mespilus, is a small, multi-stemmed flowering tree of garden origin — likely a hybrid between the North American species Amelanchier arborea and A. laevis, long naturalized and widely planted across Europe. It opens the year with a cloud of small white star-shaped flowers just as the coppery-bronze young leaves unfurl, one of the earliest and most reliable spring flowering trees for a small garden, followed in early summer by dark purple-red berries that are edible and much loved by birds. The foliage turns strong shades of orange and red in fall, giving the tree a genuine three-season display in a compact footprint most specimen trees can't match.
It grows easily in full sun to light shade and average garden soil, tolerating both moist and drier conditions once established, though it does best with consistent moisture and a slightly acidic pH. Its naturally graceful, multi-stemmed or light-branching habit needs little pruning beyond removing crossing branches, suckers at the base, and any dead or damaged wood in late winter while the tree is dormant. Rated only occasionally to moderately deer resistant, so young trees may need protection in areas with heavy browse pressure; the berries also draw birds quickly, so net or pick promptly if the fruit itself is wanted for the table rather than the birds.
Fungal leaf spot
Brown or purplish spots on the leaves, often ringed with a yellow halo, that spread and merge in warm, humid, or wet weather; heavily spotted leaves yellow and drop early.
Pick off spotted leaves and clear fallen debris to remove overwintering spores. Improve air circulation by thinning, and water at the base so foliage dries quickly. If it persists, apply a copper- or sulfur-based fungicide at the first sign.
Powdery mildew
White or grey powdery coating on leaves — usually starting on older growth in humid conditions or when nights cool.
Improve air circulation by thinning plants. Apply neem oil or potassium bicarbonate spray at first sign. Avoid overhead watering.