Spiraea prunifolia (wild varieties: eastern Asia)
Habit: Usually only small shrub, 1.2-1.5 m tall, rarely larger; 1.5-2 m wide; arching; shoots wiry thin.
Flowers: Small white umbels, individual flowers are perfectly double miniature rosettes, May.
Leaves: Lanceolate to slenderly elliptical, fresh green, conspicuous autumn colours red or orange.
Demands: Sun to shady; warm, likes protected areas as only moderately frost hardy;
Soil: Fresh to moist; acidic to neutral, avoids alkaline substrates, withering on heavy soil, otherwise all garden soil.
Hardiness: Zone 6b