Sow in pots indoors in April for planting out in May, or direct sow after danger of frost. Space or thin to 12–18 in.
Harvest for grain when seeds rub off easily in your hand, but before seedhead is crispy dry. Hang over a tarp to dry for several days, then dance, rub, or flail seeds from seedheads. Winnow to clean or place seeds in a bowl and make stirring motion with your arm; chaff rises to the top for easy removal. Isolate from other amaranths by 1/4 mile.