Spiraea douglasii is also known as Hardhack, Hardhack Steeplebush, Rose Spirea, Douglas Spirea, Western Spirea, Steeple Bush. It is a woolly, clump-forming, suckering shrub, native to North America.
Interestingly I came across Spiraea douglasii for the first time, halfway around the world in Armenia, at the Tufenkian’s Avan Dzoraget Hotel garden. By the way, this is a wonderful resort hotel located on the river about 160km north of Yerevan, the capital. It was built in 2004 in the style of medieval Armenian castles. Its architecture uses basalt stone which is a nice contrast to its landscape. An isolated, secluded, and very relaxing resort.
Spiraea douglasii is part of the Rosaceae family of plants. It is an easy-to-grow plant. It grows to about 2m or 7ft from rhizomes. It produces a large cluster plume of pink flowers in spring and early summer about 8″ or 20cm long at the tip of branches. Spiraea douglasii flowers are fragrant. The leaves are dark green, oblong, toothed, whitish, and veiny underside. Spiraea douglasii foliage turns yellow in autumn. It is native to more of riparian landscapes or bogs. In Europe, it is considered invasive. Native Americans used Spiraea douglasii as brooms and for hanging seafood to cook.
Plant Spiraea douglasii in the sun or partial shade, in average soil that is on the moist or wet side, keep it moist when it is well-drained as it does not like drying out. It attracts flowers and deer-resistant. Spiraea douglasii is generally pest-free and disease-free. Propagate by softwood cuttings in summer or division early in spring. If you need to prune Spiraea douglasii then do it after flowering.