Spiraea douglasii Spiraea douglasii is a species of flowering plant in the rose family. Common names include hardhack, hardhack steeplebush, Douglas' spiraea, and rose spiraea. It is native to western North America from Alaska across southwestern Canada and the Pacific Northwest.
It occurs most often in riparian habitat types, such as swamps, streambanks, bogs and mudflats. It grows among sedges, horsetails, wild blueberries, and other swamp flora. The plant is a woolly shrub growing 1 to 2 meters tall from rhizomes, forming dense riverside thickets. Large clusters of small pink flowers form spires in early summer, later turning dark and persisting. The leaves are toothed toward the tips. The undersides are whitish with prominent veins.
This plant is used as an ornamental in landscaping, where it grows best in sunny, moist places.
Propagation: Fresh seed germinates easily without any pretreatment while dry seed may require one to two months of cold stratification. Seeds should be soaked for 24 hours before stratification in mesh bags in peat. Requires consistently moist soil; do not let dry out between waterings. Fast growing, to 3-6 feet tall and spreads easily, forming monocultures.
Manufacturer: N/A
SKU: SEED161