Heuchera Palace Purple Coral Bells Pelleted Seeds - 100 Flower Seed Heuchera is a genus of largely evergreen perennial plants in the family Saxifragaceae, all native to North America. Sprinkle seeds onto the surface of the soil, making sure not to cover the seed as they need light to germinate. You can also start seeds indoors a couple of months before you plan to transplant. Coral bells seeds take two to eight weeks to germinate. Once established, harden off the plants for 10 days, then transplant the seedlings outdoors after all danger of frost has passed. Perennial, 3-4 weeks at 20oC; sow April-July. Heuchera Palace Purple Coral Bells Pelleted Seeds - 100 Flower Seed