Perennials You Can Still Plant in May for blooms that return every year! Best for: US Zones 39 UK sow or transplant once frost ends Australia cooltemperate plant now for spring blooms Garden Phlox full sun, butterflies love it False Indigo drought-tolerant, hardy & bold Yarrow resilient pollinator magnet Shasta Daisy classic white blooms all summer Coneflower Echinacea tough, loved by bees Bee Balm attracts hummingbirds & bees Black-eyed Susan thrives in heat and poor soil Poppy easy to scatter, beautiful in masses Allium striking globe flowers that bees adore