If you want a compact shrub that delivers color in both foliage and bloom, Spiraea japonica 'Double Play Red' is a strong choice. Your Japanese Spirea 'Double Play® Red' leafs out with rich burgundy-purple new growth that matures to green, then tops itself with dense, flat clusters of deep pink-red to near-red flowers from late spring into summer.
Give it full sun for the best flowering and the deepest foliage color, though it will also perform in part shade. Plant it in average, well-drained soil and water regularly the first season to help it establish; once rooted, it is generally adaptable and easy to maintain in most garden settings.
At maturity, expect a naturally rounded mound about 24-36 inches tall, with a similar overall width. This size makes it useful where you need a low hedge, foundation accent, or a repeatable border plant that stays tidy without constant shaping.
For the cleanest look, prune after flowering or lightly shape as needed to keep the mound dense. A spring feeding and a little cleanup of older stems can improve vigor and bloom. The flowers can draw pollinators such as butterflies and hummingbirds, and the plant is often noted for deer resistance.