Microgreens Fast Harvest NFT Recipe
An ultra-fast NFT recipe for growing nutrient-dense microgreens in just 7-14 days, from seed to harvest with minimal input and maximum nutritional value.
Microgreens are the fastest crop you can grow in a hydroponic system, with most varieties ready to harvest in 7-14 days from seeding. This NFT recipe is optimized for speed, density, and nutritional content — microgreens contain 4-40 times the nutrient concentration of their mature counterparts, making them a superfood that's incredibly easy to produce. Nutrient film technique is ideal for microgreens because the shallow, wide channels provide a large growing area with minimal water and nutrient usage. Seeds are typically sown directly on thin coco mats, hemp mats, or felt pads placed in shallow NFT channels. The thin nutrient film keeps the medium moist from below while the seeds and young shoots remain above the water line, preventing damping off. The beauty of microgreens is their simplicity: most varieties need nothing more than water and light for their short growing period, as the seed itself contains all necessary nutrients for the first 7-10 days of growth. This recipe includes a light nutrient supplement for varieties grown beyond 10 days (like sunflower, pea shoots, and cilantro microgreens) to maintain deep color and maximum nutrient density.
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Do microgreens need nutrients or can they grow in plain water?
Most microgreens can grow to harvest using only water and the nutrients stored in the seed. For fast varieties (radish, mustard, broccoli) harvested at 7-10 days, plain water is sufficient. For varieties grown beyond 10 days (sunflower, pea shoots, cilantro), a very light nutrient solution (EC 0.3-0.5 mS/cm) improves color, nutrition, and stem strength. Never use full-strength hydroponic nutrients — microgreens are very sensitive.
How do I prevent mold on microgreens?
Mold is the biggest challenge with microgreens. Prevention strategies: use clean, sanitized equipment; add food-grade hydrogen peroxide (3%, 5 ml/gal) to water during germination; maintain good airflow with a gentle fan after removing the blackout cover; don't overwater — the growing mat should be moist, not waterlogged; reduce humidity to 50-60% after the blackout period; and ensure adequate spacing between trays for air circulation.
What is the best seeding density for microgreens?
Optimal seeding density depends on seed size. Small seeds (broccoli, radish, mustard, amaranth): 10-15 seeds per square inch, or about 1 oz of seed per 10x20 tray. Medium seeds (sunflower, beet): 6-8 per square inch, or 3-4 oz per tray. Large seeds (peas): 5-6 per square inch, or 8-10 oz per tray. Too sparse leads to thin, floppy stems. Too dense causes mold, poor airflow, and uneven growth.
What is the blackout period for microgreens and why is it important?
The blackout period (3-5 days of darkness after seeding) serves two purposes: it maintains high humidity for uniform germination, and it forces the stems to elongate as they search for light. This produces taller, more tender microgreens. Without blackout, microgreens tend to be short and stubby. After blackout, expose to light and the pale yellow shoots will green up within 24-48 hours.
Can I regrow microgreens after cutting?
Generally no — most microgreens are a one-cut crop. Once you cut the stem above the growing point, the plant cannot regrow. Exceptions include pea shoots, which can sometimes produce a second (smaller) harvest if cut above the lowest node. For continuous production, start a new tray every 2-3 days so you always have microgreens at different stages of growth.