How to Grow Amaranth: Complete Grain, Greens & Ornamental Guide

How to Grow Amaranth: Complete Grain, Greens & Ornamental Guide

Amaranth is the ultimate triple-threat garden plant. From a single seed, you get: protein-packed grain seeds (a pseudo-cereal cousin of quinoa), nutritious edible leaves (a spinach substitute that thrives in heat), and stunning ornamental flower plumes in vivid reds, purples, oranges, and golds. No other crop gives you this much versatility from this little effort.

Amaranth has been cultivated for over 8,000 years — it was a sacred grain of the Aztecs, a staple green across Africa and Asia, and is now one of the hottest "ancient grains" in health food circles. Like its cousin quinoa, amaranth is a complete protein containing all nine essential amino acids. But unlike quinoa, amaranth is also a spectacular ornamental that makes your garden look incredible while feeding you.

Quick Facts

Three Types of Amaranth

1. Grain Amaranth (Seeds)

Grown primarily for tiny, protein-rich seeds. Tall plants (5-8 feet) with large, dense seed heads.

Best varieties:

• Burgundy — Deep red leaves + seed heads. Dual-purpose (greens + grain). 6-7 feet. 110 days.
• Golden Giant — Bright golden seed heads, high yield. 6-8 feet. 120 days.
• Plainsman — Bred for grain production. Tan seeds, high yield. 5-6 feet. 100 days. Best for short seasons.

2. Leaf Amaranth (Greens)

Grown for nutritious edible leaves — a heat-loving spinach substitute. Shorter, bushier plants.

Best varieties:

• Red Leaf (Red Stripe) — Vivid red and green bicolor leaves. Beautiful and delicious. 2-3 feet.
• Calaloo — Caribbean staple. Tender green leaves. The classic cooking amaranth. 3-4 feet.
• Merah — Southeast Asian variety. Deep red leaves. Mild, sweet flavor. 2-3 feet.

3. Ornamental Amaranth (Flowers)

Grown for spectacular drooping flower plumes. Edible but grown mainly for beauty.

Best varieties:

• Love Lies Bleeding — Dramatic cascading red tassels up to 2 feet long. Show-stopping. 3-5 feet.
• Hot Biscuits — Upright bronze-orange plumes. Excellent cut flower. 4 feet.
• Hopi Red Dye — Traditional Hopi variety. Deep crimson. Used for natural dye + grain. 5-6 feet.

Dual-Purpose Recommendation

Burgundy amaranth — gives you edible greens (harvest leaves young), grain (harvest seeds at maturity), AND ornamental beauty (deep red foliage + seed heads). One variety, three uses.

Step-by-Step Growing Guide

1. When to Plant

Amaranth is a warm-season crop — do NOT plant until after last frost:

• Direct sow 1-2 weeks after last frost when soil is at least 65°F
• Amaranth loves heat — it grows fastest at 75-95°F (unlike its cousin quinoa, which prefers cool weather)
• Zones 3-6: Plant late May to June
• Zones 7-10: Plant April to May
• Succession sow leaf amaranth every 3-4 weeks for continuous greens

2. Planting

1. Direct sow — amaranth transplants OK but direct sowing is easiest
2. Depth: Surface sow or barely cover (1/8 inch). Seeds need light to germinate.
3. Spacing: Sow thickly, thin to 12-18 inches for grain types, 6-8 inches for leaf types
4. Row spacing: 18-24 inches
5. Germination: 4-10 days in warm soil (70°F+)
6. Tip: Mix tiny seeds with sand for even distribution

3. Growing Conditions

Sun: Full sun, 6-8 hours. Amaranth thrives in the hottest, sunniest spot in your garden — it loves conditions that make lettuce bolt.

Water: Remarkably drought-tolerant once established. Water during extended dry spells only. Amaranth's deep taproot finds moisture that shallow-rooted crops cannot. Over-watering causes leggy growth and reduces seed production.

Soil: Incredibly adaptable. Amaranth grows in poor, sandy, rocky soil where many crops fail. Rich soil produces taller plants but is not required. pH 6.0-7.5. Does NOT need fertilizer in average garden soil.

Fertilizer: Usually unnecessary. Too much nitrogen produces massive leaves but delayed seeding. A light compost top-dressing at planting is plenty. For leaf amaranth production, moderate nitrogen is OK (you want leaves, not seeds).

Weeding: Important in the first 3-4 weeks while seedlings are small. Young amaranth looks similar to pigweed (Amaranthus retroflexus), a close relative and common weed. Once established, amaranth shades out weeds aggressively.

Harvesting Greens

Leaf amaranth is one of the fastest, most heat-tolerant greens you can grow:

• Baby leaves: Harvest at 30-40 days, 4-6 inches tall. Use raw in salads.
• Mature leaves: Harvest outer leaves continuously. Cook like spinach — sauteed, in soups, curries, stir-fries.
• Cut-and-come-again: Cut plants to 4 inches above soil — they regrow 2-3 times.
• Heat advantage: Amaranth greens thrive in summer heat when lettuce, spinach, and kale bolt. Fill the "summer greens gap."
• Nutrition: Amaranth leaves contain more calcium, iron, and vitamin C than spinach.

Harvesting Grain

When to Harvest Grain

• Seed heads fully mature — seeds release when rubbed between your hands
• Plants beginning to brown — leaves dropping, stems drying
• Seeds resist denting with a fingernail (hard, not soft)
• Usually 100-120 days from planting, typically September-October
• Harvest before heavy rain or hard frost — wet mature seeds sprout on the plant

How to Harvest Grain

1. Cut seed heads with pruners into a bucket or onto a tarp
2. Dry further if needed — spread on tarps in dry, ventilated area for 1-2 weeks
3. Thresh: Rub seed heads between your hands over a bucket. Seeds are tiny (smaller than quinoa).
4. Winnow: Pour seeds between containers in front of a fan. Chaff blows away, tiny seeds fall.
5. Screen: Use a fine mesh screen to separate remaining debris

Yield: One grain amaranth plant produces about 1-3 ounces of seed. A 10x10 foot plot yields 3-5 pounds.

Using Amaranth Grain

Unlike quinoa, amaranth does NOT have a bitter saponin coating — no rinsing needed.

• Pop it: Heat a dry skillet, add a tablespoon of amaranth. Seeds pop like tiny popcorn in 10-15 seconds. Nutty, crunchy.
• Cook as porridge: 1 cup amaranth to 3 cups water. Simmer 25-30 minutes. Creamy, porridge-like texture (unlike quinoa's fluffy texture).
• Add to baking: Mix into bread, muffins, pancakes for protein boost.
• Grind into flour: Gluten-free amaranth flour for flatbreads, tortillas, thickening.

Amaranth vs Quinoa: Growing Comparison

Amaranth and quinoa are pseudo-cereal cousins in the same family, but they have different growing preferences:

Grow both! Plant quinoa in early spring for cool-weather growth, then plant amaranth in late spring for hot-weather growth. Harvest quinoa in early fall, amaranth in late fall. Year-round pseudo-cereal production from the same bed.

Common Problems and Solutions

Lodging (Tall Plants Falling Over)

Grain amaranth can reach 6-8 feet and fall in wind or rain.

Fix: Space plants 12-18 inches apart for mutual support. Avoid high-nitrogen soil. Hill soil around bases at 12 inches tall. Grow shorter varieties (Plainsman, 5-6 feet) in windy areas.

Flea Beetles

Tiny jumping beetles that make small holes in leaves. Most common on young plants.

Fix: Row covers on seedlings until plants are 6+ inches tall. Flea beetles rarely damage established amaranth. Heavy infestations: spray with kaolin clay or neem.

Amaranth vs Pigweed Confusion

Young amaranth looks identical to pigweed (Amaranthus retroflexus), a common garden weed.

Fix: Mark your planted rows clearly. Garden amaranth seedlings are typically more uniform in size and spacing than random weed volunteers. At 6-8 inches tall, ornamental varieties show distinctive leaf coloring (red, purple) that pigweed lacks.

Poor Germination

Amaranth seeds are tiny and need specific conditions.

Fix: Do NOT bury seeds deeply — surface sow or barely cover (1/8 inch). Seeds need light. Soil must be warm (65°F+). Keep surface moist until germination. Mix seeds with sand for even, thin distribution.

Frequently Asked Questions

Is amaranth the same as quinoa?

No, but they are close relatives. Both are pseudo-cereals in the Amaranthaceae family (not true grains like wheat or rice). Both contain complete protein with all 9 essential amino acids. The key differences: amaranth loves heat while quinoa prefers cool weather; amaranth seeds are tiny and cook into a creamy porridge, while quinoa seeds are larger and cook fluffy; amaranth has no bitter saponin coating (no rinsing needed); and amaranth leaves are a major edible crop. They make excellent companion crops — plant quinoa early in spring, amaranth after last frost.

Can I eat amaranth leaves?

Yes — amaranth leaves are one of the most nutritious greens you can grow. They contain more calcium, iron, and vitamin C than spinach, and they thrive in summer heat when most greens bolt. Harvest young leaves (4-6 inches) raw for salads, or cook mature leaves like spinach — sauteed, in soups, curries, and stir-fries. Amaranth greens are a staple food across Africa, the Caribbean (calaloo), India, and Southeast Asia. All amaranth species have edible leaves, including ornamental varieties.

How do I pop amaranth like popcorn?

Heat a dry skillet over high heat (no oil). When very hot, add just 1 tablespoon of amaranth seeds (do NOT add more — they burn if crowded). The seeds pop into tiny white puffs within 10-15 seconds. Immediately pour out into a bowl — they go from popped to burned in seconds. Popped amaranth has a nutty, toasty flavor. Use as cereal topping, in granola bars, trail mix, or eat as a snack. The popping is more subtle than corn — the seeds puff to about 3x their size, not as dramatically as popcorn.

How much amaranth can I grow in a small garden?

A 10x10 foot plot yields 3-5 pounds of amaranth grain — enough for 30-50 servings. For leaf amaranth, even a 4x4 foot patch provides abundant greens all summer. Each grain plant produces 1-3 ounces of seed. For a meaningful grain harvest, grow at least 20-30 plants. For greens only, 10-15 plants provide weekly harvests. Amaranth also grows well in large containers (5+ gallon) — one ornamental variety per pot makes a stunning patio plant.

Is ornamental amaranth edible?

Yes — all amaranth species are edible. Love Lies Bleeding, Hot Biscuits, and other ornamental varieties produce edible leaves and seeds, just like grain and leaf varieties. The ornamental types are bred for spectacular flowers rather than seed yield or leaf tenderness, so they may be slightly less productive for food. But they are completely safe to eat. Many gardeners grow Love Lies Bleeding specifically as a dual-purpose ornamental + grain crop.

When should I plant amaranth vs quinoa?

Quinoa: Plant 2-4 weeks BEFORE last frost in cool soil (45-60°F). It needs cool nights during flowering. Harvest in early-mid fall. Amaranth: Plant 1-2 weeks AFTER last frost in warm soil (65°F+). It thrives in the hottest summer weather. Harvest in late fall. Together, they provide year-round pseudo-cereal production from the same garden bed. Plant quinoa in March-April, amaranth in May-June. Harvest quinoa in August-September, amaranth in September-October.