Growing Microgreens for Market on a Small Farm

Your beds are cleared, the garlic is in, and the farmers market keeps running through winter while you have nothing green to put on the table. Growing microgreens for market fills that gap with a crop that turns over in 8 to 14 days, fits on a few wire shelves in a spare room, and sells for more per square foot than anything you grew in the field this summer.

It is also easy to lose money on. I have watched growers buy a pallet of trays and fancy lights, then quit by February because the numbers never worked. Here is how I set it up so the crop pays from the first month.

What growing microgreens for market actually takes

A starter setup for one market stall and a couple of restaurant accounts looks like this:

One 48 by 18 inch wire shelf unit with 4 to 5 shelves, about $90.
Two LED shop lights per shelf, 4 foot, around 40 watts each, about $20 apiece.
Thirty 10 by 20 inch trays: half with drainage holes for growing, half solid for bottom watering. Buy the heavy 1020 trays at about $3 each; the thin ones crack in a month.
A peat or coir based seed starting mix, roughly one 2.2 cubic foot bale per 25 trays.
Seed bought by the pound, not the packet.
A small fan and a timer.

That comes to around $450 including the first seed order. The space needed is a corner of a basement or mudroom that stays between 60 and 75 F. If you already start transplants indoors, you have most of this; our guide to starting seeds indoors without a greenhouse covers the same shelf and light setup.

Pick four crops and stop there

New growers try twelve varieties. Restaurants and market shoppers mostly buy four. Start with these:

Crop	Seed per 1020 tray	Days to harvest	Typical yield
Sunflower (black oil)	7 to 8 oz, soaked	9 to 12	16 to 20 oz
Pea shoots	9 to 10 oz, soaked	10 to 14	14 to 18 oz
Radish	1 to 1.5 oz	7 to 10	8 to 12 oz
Broccoli	0.75 to 1 oz	9 to 12	7 to 9 oz

Sunflower and pea are your volume and your margin. Radish is fast and colorful. Broccoli is the one health minded shoppers ask for by name. Once these four sell out every week, add a mix or something like basil, which is slow and fussy and should wait.

A weekly growing schedule that hits market day

Work backward from harvest. If you sell on Saturday and want to cut Friday afternoon, here is the rhythm for sunflower and pea:

Sunday evening: Soak sunflower and pea seed in cool water for 8 to 12 hours.
Monday morning: Drain, then spread the seed evenly over 1 to 1.5 inches of moist mix in a tray with holes. Mist the top.
Monday to Wednesday: Stack the trays three high with a fourth tray on top weighted with 10 to 15 pounds. This blackout and weight phase makes the roots grab and the stems lift evenly.
Wednesday or Thursday: Unstack when shoots push up the tray above them. Put them under lights, 14 to 16 hours a day, 4 to 6 inches from the tubes.
Daily from here: Bottom water only. Set the growing tray into a solid tray with half an inch of water for 10 minutes, then lift it out.
Friday: Harvest.

Radish and broccoli skip the soak and go in on Tuesday, since they finish faster. Write the schedule on a whiteboard by the shelves. Like succession planting without a spreadsheet, the system only works if you can see it from where you work.

Harvest, wash and pack so they last

Cut with a sharp serrated knife or electric kitchen shears about a half inch above the soil. Stop watering 12 hours before harvest; dry greens store far better than wet ones.

Do not wash microgreens you sell by the clamshell unless your local rules require it. If you grow clean, on fresh mix, with bottom watering, the leaves are already clean and washing shortens shelf life from 7 to 10 days down to 3 or 4. If a tray picked up soil splash, rinse it, spin it in a salad spinner and lay it on towels for an hour before packing.

Pack into vented clamshells, about 2 oz for market and 8 oz to 1 pound bags for restaurants, and refrigerate at 34 to 38 F straight away. Check your state's cottage food or produce rules; in most states raw microgreens sold as produce do not need a commercial kitchen, but some counties want a farm registration number on the label.

Where the common advice gets it wrong

Most microgreens guides say to grow on hemp or coconut mats because they are clean and simple. For market growers I think that is the wrong call. Mats cost 60 cents to $1.20 per tray each time, and sunflower and pea grown on mats yield noticeably less and wilt faster after cutting. A tray of seed starting mix costs about 35 cents, and the spent mat of roots and soil goes straight to your compost pile, which then goes back on your beds.

The other advice I skip is buying a dedicated grow light. Full spectrum horticulture panels at $150 each are built for plants you carry to fruit. Microgreens are harvested at the cotyledon or first true leaf stage. Cheap 5000K LED shop lights at close range give the same color and weight in my trials, at a seventh of the cost.

Pricing and the real numbers

In most regional markets, 2 oz clamshells sell for $4 to $6, and restaurants pay $25 to $40 a pound for sunflower and pea. One 1020 tray of sunflower yielding 18 oz becomes nine 2 oz clamshells, or about $45 at retail.

Per tray costs, roughly:

Seed: $1.50 to $3 for sunflower and pea, $2 to $4 for broccoli.
Mix: $0.35.
Clamshells and labels: $0.25 each, so about $2.25 per tray.
Electricity: well under $0.50 per tray per week.

Even at $6 in total costs per tray, that leaves solid margin. The true limit is your time, at about 20 to 30 minutes per tray from soak to sale. Ten trays a week is a realistic winter side income for one person, and it is a hedge that pairs well with the logic of growing more than one crop.

Frequently asked questions

Are microgreens profitable for a small farm?

They can be, mostly because inputs are cheap and the crop turns over every one to two weeks. Profit depends on steady buyers, so line up a market stall or one or two restaurants before scaling past ten trays. Without buyers, the crop spoils in about a week.

Why are my microgreens moldy or falling over?

White fuzz on the roots is often just root hairs, which vanish when misted. Grey, smelly mold and collapsed stems usually come from overwatering, overseeding or no airflow. Bottom water, cut your seed rate by 10 percent and run a small fan on the shelves.

Do microgreens need sunlight to grow?

No. A sunny window gives uneven, leggy growth in winter. Inexpensive LED shop lights 4 to 6 inches above the trays on a 14 to 16 hour timer give more even color and straighter stems than most windowsills.