What To Grow In New York Greenhouses For Continuous Microgreens

Growing microgreens in New York greenhouses is an efficient way to supply restaurants, farmers markets, CSA boxes, and direct-to-consumer sales year-round. With the right crop choices, greenhouse environment, and scheduling, you can build a predictable, continuous system that minimizes downtime and maximizes fresh yield. This guide explains which microgreens perform best in New York greenhouse conditions, how to plan continuous production, and concrete management practices for consistent quality and yield.

Why choose microgreens in New York greenhouses

Microgreens are compact, high-value crops ideally suited to greenhouse production for several reasons: they require little space, can be stacked on tiered racks with LED lighting, have short crop cycles, and command strong wholesale and retail prices. In New York, outside weather swings widely across seasons; a greenhouse provides a controlled environment that smooths temperature and light extremes, allowing production through cold winters and hot summers.
Greenhouses allow you to:

• Grow year-round by supplementing heat and light.
• Optimize microclimates for different species on separate benches or tiers.
• Reduce pest pressure compared with field production, though greenhouse-specific pests still require management.

Best microgreens for New York greenhouse production

Choose varieties that have reliable germination, short crop cycles, good shelf life, and strong flavor or appearance that buyers value. Below are robust, commonly grown microgreens with practical notes for greenhouse cultivation.

Brassicas (broccoli, kale, mustard, radish – brassica family)

Brassicas are top sellers: broccoli and kale are mild and nutritious; mustard and radish provide spicy, colorful options.

• Typical harvest window: 7-12 days depending on light and temperature.
• Seeding method: surface sow, press lightly, maintain moist cover for 2-3 days to encourage uniform germination.
• Growing notes: prefer cooler temps (18-22degC) and moderate light; avoid excessive heat which accelerates bolting or leggy growth.
• Yield: expect roughly 150-350 g per 10×20″ tray of fresh microgreens depending on density and species.

Radish (Raphanus spp.)

Radish microgreens are fast, bold, and popular. They germinate quickly and can be used for very short rotations.

• Harvest window: 5-8 days for many varieties; some daikon types take a little longer.
• Special notes: very tolerant of slightly cooler conditions and can be harvested a little earlier for higher turnover.

Pea shoots and snap pea microgreens

Pea shoots provide sweet, crunchy stems and are excellent for chefs and consumers.

• Harvest window: 9-14 days to reach a full shoot with tendrils.
• Seeding method: heavier seeding and a single-layer soak/stratification can speed germination.
• Growing notes: require slightly deeper rooting medium and more vertical space; do well on longer photoperiods and slightly warmer temperatures (20-24degC).

Sunflower

Sunflower microgreens are hearty, visually appealing, and high-yielding in weight.

• Harvest window: 8-12 days for premium texture.
• Special notes: need good drainage and a thicker soil layer to support heavy stems; often grown on single-layer trays to prevent matting.

Beets, chard, and amaranth

Colorful leaf microgreens like beet and amaranth are slower to mature but add striking color.

• Harvest window: 10-18 days.
• Growing notes: these are leafier and sometimes more sensitive to humidity — keep air flow steady to reduce fungal risk.

Herbs (basil, cilantro, dill — as baby leaves rather than classic microgreens)

Many herbs do better as baby leaf than as true cotyledon-stage microgreens, but they remain high-value items.

• Harvest window: 14-25 days depending on species.
• Growing notes: basil likes warm, bright conditions; cilantro is trickier due to slow germination and should be sown thicker and kept warm at first.

Environmental control: greenhouse setups for year-round production

Success in New York hinges on managing light, temperature, humidity, and air movement.

• Light: In winter, supplement with LED fixtures providing 120-200 umol/m2/s for 12-16 hours daily. In summer, use shade cloth when midday sun is intense; microgreens prefer consistent diffuse light rather than direct scorching sun.
• Temperature: Aim for 18-24degC (65-75degF) for most species. Brassicas prefer the cooler end; peas and basil like the warmer end.
• Humidity: Maintain relative humidity around 40-60%. High humidity promotes damping-off and fungal growth; use fans and vents to increase exchange and keep leaves dry.
• Air movement: Continuous gentle airflow across benches reduces disease. Oscillating fans combined with exhaust ventilation are effective.
• Heating: Insulate greenhouses and use targeted heating during deep winter. Microgreens have a small canopy and can be efficiently grown in heated rooms or insulated houses with zoned thermostats.

Growing media, seeding rates, and sanitation

Choice of medium and cleanliness are critical to reduce crop failure.

• Media: Use a sterile, well-draining, lightweight mix designed for microgreens or a coconut coir/peat blend. Depth of 1-2 cm is sufficient for most microgreens; peas and sunflowers may need 2-4 cm.
• Seeding rates (approximate for a 10×20″ tray; adjust by seed size and desired density):
• Broccoli/kale/mustard: 4-8 g per tray.
• Radish: 8-12 g per tray.
• Pea shoots: 60-90 g per tray (peas are large; density measured by weight).
• Sunflower (dehulled): 80-150 g per tray.
• Beet/amaranth: 6-12 g per tray.
• Herbs: 6-15 g per tray depending on seed size and species.
• Sanitation: Start with clean, food-grade trays and sanitize bench tops between crops. Avoid reusing media without sterilization. Use fresh seed from reputable suppliers and rotate seed lots to reduce disease risk.

Watering and irrigation

Consistent moisture without waterlogging is the goal.

• Methods: Bottom watering (placing trays in shallow water) and overhead misting both work; bottom watering reduces damp foliage and lowers fungal risk.
• Frequency: Keep media evenly moist. Young seeds need a consistently moist surface for germination; once established, water lightly to prevent soggy conditions.
• pH: Aim for substrate pH near neutral (5.5-6.5) for optimal nutrient uptake.

Pest and disease management

Even in greenhouses you will encounter issues like fungus gnats, damping-off, gray mold, and aphids. Preventive measures are most effective.

• Sanitation: Clean trays, sterilize tools, and remove plant debris promptly.
• Cultural controls: Avoid overwatering, maintain airflow, and stagger plantings to reduce large contiguous patches that encourage disease spread.
• Biological controls: Use predatory mites or beneficial nematodes to control fungus gnats; Bacillus-based soil treatments can reduce damping-off incidence.
• Monitoring: Inspect trays daily, especially during the first week when damping-off can be most severe.

Scheduling for continuous harvest

A continuous system relies on staggered sowings and a mix of crop lengths. The typical approach is to sow a few trays every day or every other day, depending on demand.

• Rule of thumb: For daily harvests, plan for a rolling inventory of trays at different stages. If your average harvest time is 10 days and you want 10 trays harvested per day, maintain 100 trays in rotation.
• Mixed rotation: Sow fast crops (radish, mustard) on short intervals and mix in slower crops (peas, basil) so that every day yields a variety of textures and flavors.
• Sample weekly sowing plan for diversity (example for a small operation with one bench of 30 trays):
• Monday: 5 trays broccoli, 1 tray peas.
• Tuesday: 5 trays radish, 1 tray sunflower.
• Wednesday: 5 trays kale, 1 tray beet.
• Thursday: 5 trays mustard/mizuna, 1 tray basil (longer).
• Friday: 5 trays broccoli, 1 tray peas.
• Saturday: 2 trays for bespoke orders or testing new varieties.
• Sunday: clean and sanitize a portion of benches; rest day for smaller operations.

This type of staggered plan creates continuous pick points while allowing sanitation windows and testing.

Harvest, postharvest handling, and yields

Timely harvest and proper handling determine shelf life and customer satisfaction.

• Harvest stage: Cut microgreens above the substrate at the hypocotyl base when the first true leaves appear for many species, earlier for radish if a sharper bite is desired.
• Postharvest: Rinse lightly if required, drain thoroughly, and cool quickly to 1-4degC to extend shelf life.
• Packaging: Use breathable clamshells or perforated containers to limit condensation. Pack to minimize handling and bruising.
• Expected yields: Fresh weight per 10×20″ tray ranges roughly from 150 g (leafier, lighter crops) up to 400 g (sunflower, heavy-stemmed shoots). Plan production economics using your average observed yields after several cycles.

Practical takeaways for New York producers

• Start with a core set of reliable crops: broccoli, kale, radish, pea, sunflower, and mustard. They balance speed, flavor, and market demand.
• Invest in LED lights and insulation to reduce energy costs in winter. Tiered racks multiply floor space and keep greenhouse footprint small.
• Standardize tray size (10×20″) and media to simplify seeding rates, irrigation, and labor.
• Stagger sowings and maintain a rotation buffer equal to the longest crop cycle to ensure continuity during delays.
• Emphasize sanitation and airflow to prevent the most common greenhouse microgreen failures.
• Track seed lot performance, germination rates, and yields so you can refine seeding rates and scheduling for local conditions.

Growing microgreens in New York greenhouses is highly scalable and resilient when built on repeatable practices: choose the right crops, control the environment, and schedule strategically. With those components in place you can supply a steady stream of fresh, flavorful microgreens year-round.