Outsidepride Heuchera Firefly Flower Seed - 5000 Seeds Heuchera Coral Bells provide lovely rosy red flowers from early spring through mid-summer. The flowers are great for cutting and add beauty to any arrangement. These perennial plants are good for Zones 3 - 8 and prefer moist soil and a partial sun exposure in the hot summer areas. Start these flower seeds with a cold treatment to help break dormancy. Use 8 to 10 seeds per plant. Firefly plants have low-mounding foliage, but the flowers will reach 12 to 16 inches tall. Heuchera sanguinea fire fly is an excellent border plant with neat, evergreen foliage and graceful nodding flowers. Our seeds are always non-GMO and packaged for the current growing season.