Growing amaranth from seed: warm-soil sowing, steady care, and smart harvest

Amaranth is a heat-loving annual that gives you two payoffs: tender greens early and striking seed heads later. It doesn't ask for pampering, just warm soil, a fine seedbed, and early weed control. Our Red Amaranth Seeds and Green Amaranth Seeds are both excellent choices for warm-season gardens.

Context & common pitfalls

Heat matters. Amaranth germinates and grows best in warm soils; rushing the sowing is the most common failure.

Tiny seeds, shallow planting. The seed is extremely small, so depth and seed-to-soil contact are critical. Over-burying leads to poor emergence.

"Planting should be done when the soil temperature is at least 65 °F… Seeds should be planted no more than 1/2 inch deep… seedlings are fragile, so it is important to have a fine, firm seedbed." — University of Minnesota Extension

Useful stats: Vegetable amaranth seed germinates best near 70–75 °F soil temperature. A pound of amaranth seed contains about 600,000 seeds, which is why uniform shallow coverage matters.

Growing framework: seed to harvest

1) Prepare the seedbed

• Choose a full-sun spot with well-drained soil.
• Work the top 2–3 inches to a fine, firm texture. Remove clods and debris.
• Wait until soil temperature is reliably above 65 °F before sowing.

2) Sow shallowly

• Scatter or drill seeds at about 1/4 inch depth or barely covered.
• Firm the soil gently after sowing for good seed-to-soil contact.
• Water gently to avoid washing seeds away.

3) Thin and weed early

• Thin seedlings to about 6–12 inches apart once they have 2–3 true leaves.
• Eat the thinnings as microgreens or baby greens.
• Keep the bed weed-free in the first 3–4 weeks.

4) Water and feed

• Keep soil evenly moist until plants are established; reduce frequency as plants mature.
• Modest nitrogen supports leaf growth; avoid excess if growing for grain.

5) Harvest

• Greens: harvest outer leaves or cut plants at 6–8 inches tall. Our Red Amaranth (Rau Den) is especially popular for tender leaf harvests.
• Grain: let seed heads mature fully, then cut and dry before threshing.

Tips & common mistakes

• Sowing too deep. Barely cover seeds — 1/4 inch max.
• Cold soil. Wait for consistent warmth; cold soil causes poor germination.
• Skipping thinning. Crowded plants produce fewer leaves and smaller seed heads.

FAQ

Can I grow amaranth in containers?

Yes, in large, deep containers with good drainage. Use our Green Amaranth Seeds for compact leafy varieties well-suited to containers.

Is amaranth the same as rau den?

Yes — "rau den" is the Vietnamese name for vegetable amaranth. Our Round Red Amaranth Rau Den Seeds are specifically selected for leaf harvest.

Sources

• University of Minnesota Extension – grain amaranth guide
• UF/IFAS EDIS – vegetable amaranth production