Perennials

Double flowering Yarrow  Heights 24 inches Spread 30 inches Bloom time June to September Plant in full to partial sun 

Iris siberica paprikash  Height 20 in  Bloom time June July Full sun part shade  USDA zone 3

Giant double Japanese Iris  Height 40 in  Bloom June July  Full sun to part shade  USDA zone 4

Height 32 inchesSpread 24 to 30 inches Bloom time July Part shade to full shade Hardy in zone three

Height 30 inchesSpread 18 inches Bloom time July to October Heart shade to full shade Hardy in zone three

Height 18 inchesSpread 18 inches Bloom time June to July Part shade to full Shade Hardy in zone three

Height 24 inchesSpread 18 inches Bloom time August to September Park shade to full shade Hardy in zone three

Height 36 inchesSpread 30 inches Bloom time July Part shade, full shadehardy in zone three

Height 28 inchesSpread 24 to 30 inches Bloom time July Part shade to full shadeHardy in zone three