Buy Flowers › Thalictrum delavayi - 4" Pot Thalictrum delavayi - 4" Pot $8.50 Meadow Rue, zone 4-7, dense purple rose flower clusters on tall stems in summer, 3-5' tall, sun/pt shade, medium water requirements Add To Cart Added! Meadow Rue, zone 4-7, dense purple rose flower clusters on tall stems in summer, 3-5' tall, sun/pt shade, medium water requirements