Threelobe Spirea Spiraea trilobata

Spiraea trilobata, or Threelobe Spiraea, is a spiraea cultivar. It is a dense, upright, compact deciduous shrub that typically grows to 3-4' tall with a slightly larger width. This cultivar is noted for its numerous white flowers displayed in crowded umbels in spring. The flowers, which are attractive to butterflies, are offset by three-lobed, coarsely-toothed, blue-green foliage. You can remove faded flower clusters to promote additional bloom and, once flowering has ceased for the season, you can prune the plant. Because the plant has a dense, compact habit, slender with spreading branches, selective pruning may be all that is necessary.

Threelobe Spiraea is easily grown in average, medium, well-drained soil in full sun to part shade. It can tolerate a wide range of soils, including sandy sites, but prefers a good loamy soil. It also tolerates drought. In its native habitat, it is typically found in thickets or ravines, sunny slopes, and along roadsides.

Insects, Diseases, and other Plant Problems:

Susceptible to many of the diseases and insects that attack other members of the rose family, including leaf spots, fireblight, powdery mildew, rots, aphids, leaf roller and scale.