A small population was established from this seedlot and plants offered were propagated via softwood cuttings from that population. Probable hardiness USDA Zone 4. If you still have the S. fritschiana accession offered in 1976, PI 317286, compare it to PI 603126. Spiraea trilobata L. Threelobe Spirea. This is a relatively small shrub of up to 4 to 5 feet tall with a dense compact habit and slender spreading branches.
Older branches are gray and one-year stems light brown to amber.
May. Native to northern China to Siberia and Turkestan, this spirea is one of the parents of the Vanhoutte Spirea. It is reported to withstand considerable shade and still flower well. Ames 22275 is a seedling population from a seedlot collected from wild material from Yong Xiu Gou, Wuling Shan Preserve, Miyun County, Beijing Municipality province, China. Plants were growing in rocks near the stream in association with Weigela florida, Spiraea sp., Juglans mandshurica, Allium sp., Rhamnus sp., and Vitex negundo var. Probable hardiness USDA Zone 5.