Aug-Oct, H 18-36", W 18-48", Z 3-9-Minnesota-bred Mammoth™ is extra hardy. True perennials that come back year after year, they can survive -30°F. Requires no pinching, pruning or deadheading. By their second or third year, they can reach 4' across, making a tremendous impact in the landscape. PP
Growing Zone: 3-9
Light Requirements: Full Sun
Own Root
Height: 18-36"
