You don’t need a spare room to grow microgreens year-round. A single wire shelving unit, a couple of LED lights and a small fan can produce several trays a week in a corner of a kitchen, a hallway or a spare closet. This guide covers where to put it, what to buy, how to wire and arrange it, and a simple weekly plan.
Choose the right spot
Look for a place that is:
- 65–75°F (18–24°C) year-round. Avoid spots next to heaters, ovens, fridges’ warm exhausts or cold exterior doors.
- Near a power outlet, ideally one you can plug a power strip and timer into.
- Easy to clean. A hard floor is better than carpet, because some water will drip.
- Out of direct afternoon sun, which can overheat trays. A grow light gives more consistent results than a window.
- Away from house plants with gnats or pests.
A kitchen corner is convenient because watering and harvesting happen near the sink.
Pick a shelf
A common setup is a wire shelving unit about 36–48 inches (90–120 cm) wide and 14–18 inches (35–45 cm) deep.
- A 48 × 18 inch shelf holds about four 10×20 trays, or two side by side with room to work.
- A 36 × 14 inch shelf holds about two 10×20 trays lengthways, or several 10×10 trays.
- Leave 12–16 inches (30–40 cm) of height between shelves for lights and plants.
Wire shelves are ideal because light chains hook straight onto them and air moves through. Put a waterproof tray or a cut piece of plastic sheet on each shelf to catch spills.
Lights
Hang one or two LED shop lights under each shelf so they shine down onto the shelf below. Use adjustable chains or ratchet hangers so you can keep the lights about 3–6 inches above the seedlings. Our grow lights guide explains distances and intensity.
Plug all lights into a single power strip with a timer, set for 16 hours on and 8 hours off.
Electrical safety: keep plugs, strips and timers above the level of any spills, use drip loops in cables, and never overload outlets. Check that lights are rated for the location.
Airflow
A small clip-on fan running on low is the best mold prevention you can buy. Position it so air moves gently across the trays — the seedlings should just barely sway. Run it during the light period at least; many growers run it around the clock.
Use the shelves for different stages
| Shelf | Use |
|---|---|
| Bottom shelf | Blackout — stacked, covered trays (no light needed) |
| Middle shelves | Growing trays under lights |
| Top shelf | Storage for trays, seed containers and sealed growing medium |
This keeps blackout trays out of the way and makes the system flow from sowing to harvest.
A simple weekly plan for one household
This plan gives a steady supply of two to three fresh trays a week using 10×10 trays.
| Day | Task |
|---|---|
| Monday | Sow 1 tray radish + 1 tray broccoli; start soaking peas in the evening |
| Tuesday | Sow 1 tray pea shoots; check blackout trays |
| Thursday | Uncover Monday’s trays; bottom water |
| Friday | Sow 1 tray of a “flavor” crop (mustard, arugula, kohlrabi) |
| Daily | Bottom water trays under light; mist blackout trays if dry; check for mold |
| Weekend | Harvest whatever is ready; compost spent trays; wash and dry trays |
Times will vary with your crops and conditions — use the days-to-harvest chart to adjust.
Shopping checklist
| Item | One shelf | Notes |
|---|---|---|
| Wire shelving unit | 1 | 36–48 in wide, 14–18 in deep |
| LED shop lights | 1–2 per growing shelf | Linkable, 4000–6500K |
| Plug-in timer | 1 | Mechanical or digital |
| Power strip | 1 | Mount above floor level |
| Small clip fan | 1 | Low speed |
| Growing trays with holes | 4–6 | Plus covers |
| Solid trays without holes | 4–6 | For bottom watering |
| Growing medium | 1 coco brick or bag of mix, sealed | See growing medium guide |
| Seeds | 3–4 crops to start | Untreated microgreen seed |
| Spray bottle, scissors, kitchen scale | 1 each | Scale for weighing seed |
Keep it clean
- Wash trays in hot, soapy water after every harvest and let them dry fully.
- Wipe shelves weekly.
- Store medium sealed to avoid fungus gnats.
- Compost spent trays promptly rather than leaving them on the shelf.
Frequently asked questions
How much space do I need to grow microgreens?
A single windowsill or one shelf is enough for a household. A 10×10 tray every few days gives a regular supply for one or two people.
Can I grow microgreens in a closet?
Yes, with lights, a fan and good ventilation. Keep an eye on humidity and temperature, which can build up in a closed space.
Do I need a heat mat?
Only if your room is below about 65°F (18°C). Use it during germination only, and remove it after blackout.
How many trays should I start with?
Start with one or two. Once you have a routine, add trays gradually and stagger sowing days. Our beginner’s guide covers the basics.
