Description

Hardy Ginger (Hedychium) are typically grown for their late summer flowers and vertical wide-leaf foliage. The plants are large tropical and subtropical herbaceous perennials with a rhizomatous rootstock native to areas with a summer monsoon and dry winter. They can be grown as flowering summer patio plants. If growing as a potted plant and trying to overwinter, allowing the foliage to frost is ok, it will not kill the root system. However, do not allow the pot with rootball to freeze solid or go below 20 degrees for more than a few hours; move into a cold garage or basement over the winter with no watering. Cut back and allow to go dormant and place entire pot back out in April or May with a time-release fertilizer. Another more labor intensive way to overwinter cannas is to remove them from the dirt, dust with fungicide, place in box with sawdust, and keep in the refrigerator. We consider this method old-fashioned and too much work but ok if you only want to save a few pieces. If digging from the ground, just save a big chunk with the dirt intact and place into a large pot in the garage. During the growing season, fertilize, water regularly, and place in full sun. You may also plant these in the ground for an enormous tropical effect! It is possible to overwinter these in the ground in Kansas by mulching 6-12" thick over deeply planted rhizomes. New growth may be slightly delayed but probably quick to regain full height. Native habitat for most hedychiums aligns well with our dry winters and warm humid summers. In our trial gardens in Lawrence, KS (zone 6a), we will be testing several varieties in 2022-2023. Famous plantsman, Tony Avent, owner of Plant Delights Nursery in Raleigh, North Carolina, advised us that hedychiums should survive fine here in the ground when mulched like cannas. Hedychium 'Raffillii' features bright orange flowers that can reach 18 inches above the 5-6 feet canes.