Specially bred to withstand severe cold, these mums are exceptional. They form into even mounds without pinching and pruning. When other summer blooms begin to fade, these will fill to bursting with colorful blooms in vibrant hues. Planted in spring (instead of traditionally fall-planted varieties), these will have longer in the garden to establish roots. That gives your mums more energy to grow and bloom, and the strength to become truly perennial.