perennial bachelor button, mountain bluet Centaurea montana Type:perennials that last Notable Traits:attracts butterflies/pollinators, low-maintenance, resistant: deer, resistant: disease, resistant: rabbit, tolerates clay soil, tolerates harsh roadside conditions Hardiness:Zone 3 – 8 Mature Height:12-18in Light:sun (8+ hrs) Water:drought tolerant Bloom Color:blue Bloom Time:fall, summer Foliage:green Description Large, glowing blue, spidery blooms all summer and into fall on 18-24″ plants. Can self-seed and surprise you from year to year.