Igloo Hardy Mums
Perennial Igloo Series mums (Dendranthema) look like other garden mums, and are easy to grow, but they’re reliably hardy to -20ºF (Zone 5). Available in five colors: white, yellow, raspberry, coral red and orange bronze. They produce nearly spherical plants from a single cutting, with no pinching, and grow 18 to 24 inches tall and 30 inches wide. From Blooms of Bressingham®, available from Green Leaf Plants.