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Gather the seeds and plant in late fall by spreading the seeds along the field. Amaranthus seeds can be directly seeded into your flower garden, or started indoors for transplanting later.Space seeds or seedlings 10-12" apart. They will tolerate a little crowding, and look good in clumps or groups.Amaranth is a warm season crop that requires full sun. Best germination occurs when soil temperatures are warm and grows well by planting in the same spot as leaf lettuce or radishes.