Outsidepride Butterfly Bush Violet Buddleia Davidii Plant Seed - 100 Seeds Butterfly Bush Violet, also known as Summer Lilac grows as a hardy perennial in USDA Zones: 5 - 9 and thrives in full sun. Buddleia davidii is very tall, reaching 72 - 96 inches in height and has aromatic violet to purple flowers from summer through fall. This fragrant plant is drought tolerant and very attractive to butterflies, the occasional hummingbird, and is deer resistant! Sow these heirloom seeds at 3 - 4 seeds per plant in well-drained soil and keep moist until germination occurs in 14 - 21 days. Our seeds are always Non-GMO and packaged for the current year.