About This Plant
Maca is a low rosette-forming Brassicaceae crop from the high central Andes, grown for a swollen hypocotyl fused with the upper taproot. Commercial root production begins with tiny botanical seed and normally takes about 210-250 days in the documented Peruvian highland system. A separate second phase replants selected hypocotyls to produce flowers and botanical seed. Loose organic-rich soil, careful stand establishment, drainage, and timing with seasonal rain are central to production. Outdoor high-Andean fields and semi-controlled greenhouses are verified, and controlled-environment growth chambers have grown maca through early hypocotyl thickening; hydroponic solution recipes remain unverified.
How to Grow Maca
Learn how to grow Maca from seed to harvest in 240 days. Intermediate difficulty. Complete nutrient guide, pH/EC requirements, and growing conditions for soil & container.
Sources cited: 16.
Nutrient Requirements by Growth Stage
No verified paper or extension guide supports stage-specific maca nutrient-solution ppm, fertigation injection rates, or reservoir EC and pH. Both NPK lanes returned null for all four schema stages, so the 15% averaging rule had no numeric inputs and the existing ppm profile remains unverified…
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Growing Environments
Outdoor high-Andean soil production and semi-controlled greenhouse production are both directly verified. The field system is commonly rainfed, with supplemental irrigation used according to soil and crop need…
Temperature
Maca is adapted to cold high-Andean production, but successful growth is not confined below 12 C. It germinated and established as seedlings under 18-28 C greenhouse conditions and then grew and thickened hypocotyls in growth chambers held at 20/18 C. INIA describes representative field conditions around a 7 C mean, with -5 C minima and 15 C maxima, and a productive semi-controlled greenhouse averaged 22.5 C by day and 7.92 C by night, with its authors describing about 15-25 C as suitable guidance. These are production and chamber contexts rather than a controlled species response curve, and together they refute the previous 1.5-12 C universal band and any refrigerated hydroponic protocol. Germination is temperature-dependent: about 5-7 days at 25 C under moist conditions, but half-emergence took 11-26 days in colder alternating regimes.
Humidity
No eligible source tested a crop-wide relative-humidity optimum, and maca grew well below the previous 50-80% floor. One controlled study developed hypocotyls at about 25% chamber humidity, and a productive semi-controlled greenhouse averaged about 49% RH at 08:00, 30% at noon, and 35% at 15:00, with monthly…
Light
Provide bright, evenly distributed light while preventing severe self-shading. Maca developed hypocotyls under 350 micromol PAR/m2/s of overhead HPS in a controlled trial, where 16-hour days promoted early yellow maca shoot, root, and hypocotyl growth relative to 8-hour days through day 88; the authors called for…
Airflow
Use controllable ventilation in protected maca production. The verified greenhouse used ridge openings and adjustable insect-mesh and plastic side curtains; operators opened the curtains during midday heat and used four-metre windbreaks to protect the structure and crop from strong puna winds…
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Hydroponic System Compatibility
The best verified protected system is a horizontal soil bed supplied by drip irrigation. Drip is therefore suitable when the root zone is soil or organically amended soil…
Growing Media
Use a solid, loose, organic-rich root zone. For full-cycle hypocotyl production, use finely worked, organic-rich loam (soil); fine tilth matters because maca seed is very small, while adequate root-zone volume and uniform moisture matter later as the hypocotyl expands…
Container Specs
No retained complete source establishes a mature maca container's minimum width, depth, volume, drainage specification, or material. The only mature production comparison used 2.6 L soil-filled vertical pots, and those pots performed worse than horizontal beds because of restricted roots, lower water retention, uneven…
Training & Support
The verified cultivation sources prescribe uniform broadcast sowing, thinning, hand weeding, selected-hypocotyl handling, and reproductive-phase spacing, but they do not explicitly prescribe or reject stakes, trellises, cages, string, netting, pruning, or topping. Absence of a support recommendation is not evidence…
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Propagation
Commercial hypocotyl production starts from botanical seed. Broadcast the tiny seed into a finely worked, moist seedbed as the first rains begin, mixing it with soil or sand for even distribution; INIA gives 1.5-2.0 kg/ha of pure seed and the IPGRI chapter reports resulting stands of roughly 400,000-700,000 plants/ha…
Harvesting
Harvest the hypocotyl crop in dry weather about 210-250 days after sowing in the documented high-altitude Peruvian system; 240 days is a supported representative scalar rather than a fixed deadline. Sample the crop before lifting: only about 5-10% of foliage should remain green, and mature hypocotyls should resist…
Planting Calendar
The structured month arrays represent the central-Andean Southern Hemisphere system and must be shifted to local rainfall and temperature elsewhere. Prepare a fine seedbed before seasonal rain and direct-sow the root crop from September through November…
Common Issues
Verified field concerns include hypocotyl-boring insects, weevils associated with potato rotations, Copitarsia feeding, aphids, Oidium and downy mildew reports, Urocystis smut, Fusarium-like collar disease, and waterlogging-associated root rot. The 2000 guides use historical names, so identify the organism locally…
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