FLOWERING SHRUB. Easily-grown, deciduous shrubs, mostly attaining 5 — 7 ft. usually with white. arguta is sometimes called foam of May. It blooms in April. S. prunifolia plena has large, double flowers in early spring. The small, glossy green assume orange-red hues in early autumn. Anthony Waterer is a useful variety for the front of a shrub border. It does not usually exceed 5 ft. and is often cut back in spring to about 18 in. from soil level. The rosy-crimson flowers appear in July and August. S. Menziesii triumphans is a rather similar colour, somewhat taller to about 7 ft., and blooms at the same time. It is unhappy on thin, chalky soils. Spiraeas are increased by of half-ripe wood in July or August or by division.