Sorbaria sorbifolia ‘Sem’ Sem Sorbaria Description Sem is everything you wanted to change about Sorbaria. Compact, dense and better- branched. The emerging foliage in spring is pinkish-red turning to chartreuse until frost. A mid summer bloomer with large white panicle flower. Sizes & Prices All Sorbaria Characteristics Hardiness Zone: 3 Light requirements: Part Shade Height: 3-4' Spread: 4-6' Native: No Sizes & Prices Size: 18'' Ht $54.98 Other Information Sorbaria sorbifolia 'Sem' Sem Sorbaria Zone: 3 Part Shade HT: 3-4'