Coral bells (Heuchera sanguinea) thrive in USDA hardiness zones 3 through 8 where they produce 18-inch-tall mounds covered in pink, red or white blossoms during the summer. Although you can often buy coral bell plants in a nursery for transplanting, direct sowing into your flower bed is often cheaper and easier. Provide the coral bell seeds with the basic soil requirements they need to germinate and grow into lush mature plants.
Select a planting site. Coral bells thrive best in light shade, though they can tolerate direct sun, according to the University of Illinois.
Amend the garden site. The University of Illinois recommends providing the plant with well-drained soil rich in organic content. Loosen the soil to a depth of 8 to 12 inches with a spade, then mix in 2 inches of compost or aged manure. Follow with a general fertilizer; Purdue University suggests spreading 1 lb. of 5-10-5 fertilizer for every 50 square feet of flower bed.
Plant the coral bell seeds. Scatter the seeds across the flower bed surface, spacing each seed apart by 1/2 inch, according to McKenzie Seeds. Rake the flower bed gently to lightly cover the seeds with 1/4 inch of dirt.
Water the planting site daily in the morning and evening to keep the top couple inches of soil moist. The coral bells will typically sprout within 10 to 14 days. After germination, reduce your watering sessions to once a day with enough water to moisten the dirt to a depth of 6 inches.