Grow Guide Conditions:
Amaranth grows well in most North American soils and climates and is heat tolerant once established. It prefers a soil pH of 6.5-7.5 for highest grain production.
Grow Guide Seed:
Direct seed shallowly, 1/8-1/2 inch deep, 8-10 seeds per foot, when soil has warmed and danger of frost has passed. Keep seedbed evenly moist during germination. Thin to 1 plant every 8-12 inches. Or start seed indoors and transplant 8-12 inches apart, in rows 18-24 inches apart. Use the closer spacing for leaf production, wider spacing for grain production.
Grow Guide Pests:
Control early weeds by tilling or cultivating prior to seeding and until plants are about a foot tall, at which point they can outcompete most weeds. Use floating row covers to exclude flea beetles which damage young leaves if you are harvesting for salads. Encourage beneficial and predatory insects to control Tarnished Plant Bug (Lygus) a sucking insect that can damage the seed heads during the critical seed-fill stage, reducing grain yields.
Grow Guide Harvest:
Harvest young leaves while still tender for salads and cooked greens; cut flowers at peak bloom for bouquets; cut seed heads for grain harvest before they become fully dry and brittle to avoid shattering. Finish drying the seed heads on tarps or in paper bags in a dry, shady location. Separate the grain (seeds) from the chaff and store in a cool, dry location out of direct sunlight as you would other grains.