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Basement Crops and Indoor Microgreens for Small Spaces
Microgreens are the fastest return in indoor growing: seed to harvest in 10–21 days, no garden required.
Direct answer: Microgreens grow from seed to harvest in 10–21 days in shallow trays under a bright light, using about 1–2 inches of growing medium. A basement works if it stays between 60°F and 75°F and you manage humidity. Start with peas, radish, sunflower, and broccoli.
Microgreens basics
- Trays: 10x20 inch shallow trays with drainage, one for growing and one as a bottom tray.
- Medium: 1–2 inches of potting mix, or a hemp mat for soil-free growing.
- Seed density: 1–2 oz per tray for peas and sunflower, 1/2 oz for radish and broccoli.
- Light: 12–16 hours a day from a full-spectrum LED bar, 4–6 inches above the canopy.
- Water: bottom-water to keep leaves dry and reduce mould.
Cycle: sow, cover with a blackout dome for 3–4 days until germination, then light until harvest. Cut above the soil line with clean scissors.
Basement microclimate
Basements are cool, humid, and dark — good for germination, bad for mould. Run a small fan for air movement, keep trays off the floor, and use a dehumidifier if humidity stays above 65%. Temperature below 60°F slows germination; a heat mat fixes that for the first few days.
Other small-space crops
| Crop | Days to harvest | Light need | Notes |
|---|---|---|---|
| Microgreens | 10–21 | Medium | Fastest, highest value per square foot |
| Lettuce (cut-and-come) | 30–45 | Medium | Loose-leaf varieties, 6 in pots |
| Herbs (basil, parsley) | 40–60 | High | Pinch to keep bushy |
| Cherry tomatoes (dwarf) | 70–90 | Very high | Needs a strong light and a large pot |
| Mushrooms (oyster) | 14–21 | Low | Humidity-critical, not a plant |
Frequently asked questions
Do I need a grow tent?
Not for microgreens. A shelf with reflective walls and a fan is enough. A tent helps with humidity control and light efficiency.
Why did my microgreens mould?
Poor airflow, too much water, or seeds sown too densely. Bottom-water, run a fan, and sow at the recommended rate.
How much does a tray yield?
Roughly 8–12 oz of greens per 10x20 tray for peas and sunflower, less for radish and broccoli.
For outdoor space planning, see the quarter-acre plan; for storage, food preservation without power.
Frequently asked questions
Do I need a grow tent?
Not for microgreens. A shelf with reflective walls and a fan is enough; a tent helps with humidity and light efficiency.
Why did my microgreens mould?
Poor airflow, too much water, or seeds sown too densely. Bottom-water, run a fan, and sow at the recommended rate.
How much does a tray yield?
Roughly 8–12 oz of greens per 10x20 tray for peas and sunflower, less for radish and broccoli.