Sow amaranth seeds directly outdoors after fear of frost (anytime 5/20 - 7/20). Seed planting depth: scatter on top of soil and pat seeds (seeds need light to germinate). Keep seeds constantly moist until germination. Days to germination: 10 - 21. For baby greens, sow seeds 1” apart. For full size plants, sow groups of 4 seeds together – space groups 20” apart. Thin to strongest 1 plant. Magenta seedlings are easy to identify.
Microgreens – cut entire plant when 1” tall. Baby greens – cut entire plant with scissors when 2 - 4” tall. For cooking, harvest entire plant up to 8” tall. Harvest individual leaves anytime.
Start seeds May/early June for seed that will be ready in September. Amaranth is wind pollinated but Amaranthus cruentus is uncommon, so crossing is unlikely. Minimum population size: 5 - 25. Shake ripe seeds from plants or clip plants and dry them in paper or cloth bags. Seeds will fall to the bottom of the bags. Winnow if desired.