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Celosia is grown from seeds. These seeds are fine and require warm soil to germinate. Start them 4-6 weeks before the last frost in your area.Seeds can also be sown directly into the garden. Sow seeds when the ground is a bit warm and suitable for sowing.Sow seeds early in the season and cover lightly with 1/8" of fine soil.Space small varieties about 18" apart and larger varieties around 18"-24" apart.Smaller varieties will grow 10"-12" whereas larger types will grow up to 30".