perennial bachelor button, mountain bluet Centaurea montana Type:Perennials Notable Traits:attracts butterflies/pollinatorslow-maintenanceresistant: deerresistant: diseaseresistant: rabbittolerates clay soiltolerates harsh roadside conditions Hardiness:Zone 3 – 8 Mature Height:12-18in Light:sun (8+ hrs) Water:drought tolerant Bloom Color:blue Bloom Time:fallsummer 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.