About This Plant
Amaranth microgreens are fast, colorful Amaranthus seedlings grown for tender red-purple shoots at the cotyledon to first-true-leaf stage. They perform best as a protected indoor or greenhouse crop in shallow trays with even seeding, bottom watering, moderate light, low-strength nutrition, and strong sanitation because dense wet canopies are prone to damping-off.
How to Grow Amaranth Microgreens
Learn how to grow Amaranth Microgreens from seed to harvest in 15 days. Beginner difficulty. Complete nutrient guide, pH/EC requirements, and growing conditions for hydroponics, soil & greenhouse.
Sources cited: 9.
Nutrient Requirements by Growth Stage
Use conservative nutrition. The strongest direct amaranth microgreen EC trial found half-strength nutrient solution at EC 1.0 dS/m sufficient and recommended it over water alone or stronger solution…
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Growing Environments
Indoor racks and greenhouses are the best-verified environments because they allow control over light, humidity, irrigation, and sanitation. Containers or trays are mandatory for practical production; direct outdoor beds are not appropriate for clean microgreen harvest…
Temperature
Keep amaranth microgreens warm but not hot. General microgreen guidance supports 18-24C production, while amaranth trials used 20C for covered germination and about 25C daytime greenhouse or chamber conditions without heat stress. Use 18-24C as the practical target, with brief 25C days acceptable when airflow, shelf spacing, and moisture are controlled.
Humidity
Use high humidity only during covered germination, then dry the canopy environment down. A floating-tray amaranth study used 75% RH during a 48-hour dark germination period, while extension guidance recommends 40-60% RH for production to reduce damping-off and humidity-related losses…
Light
Amaranth microgreens need more than token light once uncovered. A Frontiers growth-chamber study used 300 umol/m2/s with a 12-hour photoperiod, and extension guidance places many microgreens below but near 15-20 mol/m2/day DLI…
Airflow
Gentle continuous air movement is a crop-health requirement, not a cosmetic detail. Dense trays trap boundary-layer humidity around stems, and extension guidance links air mixing and air exchange with uniform temperature, uniform humidity, and lower disease pressure…
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Hydroponic System Compatibility
Bottom-watered trays, ebb-and-flow benches, and floating trays have the strongest fit. The 2025 amaranth EC trial used capillary irrigation with nutrient solution applied at intervals, while another amaranth trial used floating trays over a monitored nutrient solution…
Growing Media
Choose the medium by irrigation system. Coconut fiber was the best substrate in a capillary tray trial at EC 1.0 dS/m, while perlite improved emergence, yield, and Ca/Mg accumulation in a floating-tray hydroponic study…
Container Specs
Use shallow trays with drainage and a matching bottom tray or flood bench. Research systems included small perforated trays with about 1 cm substrate and larger floating polystyrene cell trays, showing that depth is less important than even moisture, drainage, and root-zone oxygen…
Training & Support
Do not train or support amaranth microgreens. The crop is harvested as a dense seedling canopy before branching, flowering, or structural growth begins…
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Propagation
Propagate only from seed. Broadcast tiny amaranth seed evenly onto pre-wetted media at about 60-80 g/m2, then cover or blackout until emergence is uniform…
Harvesting
Harvest at the cotyledon to first-true-leaf stage, usually 10-18 days from sowing for amaranth depending on temperature, light, and cultivar. Cut just above the media with sanitized scissors or a sharp knife, keeping shoots away from substrate particles…
Planting Calendar
Treat amaranth microgreens as a protected, year-round, repeated-cycle crop. Indoors or in a greenhouse, sow and harvest every month as long as temperature, light, sanitation, and airflow are controlled…
Common Issues
Damping-off is the primary production risk because warm, humid, dense trays favor Pythium, Rhizoctonia, Fusarium, and related seedling pathogens. Symptoms include failure to emerge, pinched stems, collapse, and patchy tray loss…
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