whorled milkweed Asclepias verticillata Type:Monarch larval hosts, native perennials, perennials that last Notable Traits:attracts butterflies/pollinators, butterfly caterpillar food, midwest native, ornamental fruit & seed, resistant: deer, resistant: disease, resistant: rabbit, tolerates clay soil, tolerates harsh roadside conditions, wildlife food source Hardiness:Zone 3 – 9 Mature Height:18-24in Light:sun (8+ hrs) Water:drought tolerant Bloom Color:white Bloom Shape:cluster Bloom Time:summer Foliage:green Description Whorled milkweed blooms later than other milkweeds with white flowers July thru September. The caterpillars in the greenhouse preferred this species to all others!