MICROGREEN BUSINESS GUIDE · PORTLAND, ME

Start a microgreen business in Portland, ME.

Most Portland residents do not realize that one of the most chef-driven, nationally covered restaurant cities per capita in the country still imports most of its restaurant microgreens. The Old Port and East End chef-driven concentration, the destination dining traffic, and the demographic that expects local sourcing all create premium demand. The Portland grower who fixes that closes the loop chefs already want closed.

Quick Answer

You can start a microgreen business in Portland with under $400 in initial equipment and grow it into a $2,500 to $6,500 per month side income within 90 days. Here is the local demand picture, the unit economics at Maine wholesale prices, and the operating system used by working microgreen farms.

Walk into five chef-driven restaurants in the Old Port and along Congress Street on a Tuesday and ask where the microgreens come from. How often is the answer a southern Maine grower instead of a Boston distributor?

What Portland buys today

Portland has built one of the most nationally covered restaurant economies per capita in the country. The Old Port, East End, and West End chef-driven concentration sets plating standards on par with anywhere on the East Coast, and the destination dining traffic from Boston and beyond means accounts pay premium for ingredients that arrive fresh.

The Wednesday and Saturday Portland Farmers Market is a long-running community institution and pulls a willing-to-pay direct-to-consumer crowd. Brewery food programs, wellness cafes, and the catering tied to wedding and event venues along the waterfront round out the customer base.

For indoor growing in Portland, the climate consideration is the New England winter. A spare bedroom or basement with basic climate control holds 65 to 75 degrees through cold winters and temperate summers cleanly.

Every season another Old Port restaurant signs into a year of distributor product trucked up from Boston. What is the cost when the chefs you wanted to pitch are already on someone else's invoice?

The math, in Portland prices

Portland restaurant wholesale prices for microgreens run above the Maine average, with chef-driven Old Port and East End accounts paying premium for genuinely local cut-to-order product. Here is what the unit economics look like at conservative Portland numbers in the mid market $2,500 to $6,500 per month tier.

Startup cost

$400

Trays, soil, seed, lights. Used gear cuts this in half.

Per-tray net

$20-$30

After seed, soil, packaging, delivery.

Trays per week

100

Target for $3K-$5K/mo at Portland pricing.

Break-even week

Week 4

First positive cash week. Most growers hit it.

What that looks like in Portland square footage

A 10 by 10 foot room with two vertical shelving units holds 60 to 80 active trays. That is enough to produce $3,000 to $5,000 per month in Portland at standard wholesale prices. A two-car garage doubles it. A basement triples it.

Imagine the week where Sunday is the planting day, Tuesday is restaurant delivery across the Old Port and East End, Saturday is the market, and the app tells you exactly which trays to cut. What changes about your week when the business runs on a system?

Three things every working microgreen farm in Portland runs on

  1. A seed density and watering plan you trust. The number one cause of failed trays for new growers is over- or under-seeding. The cheat sheet inside Grown Like A Pro gives you grams per 10x20, soak hours, blackout days, harvest day, and watering for sixty-one varieties.
  2. A rotation tracker. Once you are running thirty-plus trays per week, you cannot remember what is in blackout, what is in light growth, what harvests Tuesday. A spreadsheet works for the first month. After that you need a system that pings you the day before each harvest and reorders seed before you run out.
  3. A customer + invoice layer. Restaurants in Portland want predictable weekly invoices and net-15 terms. Farmers market customers want clamshell tracking. Both want consistency. The app handles both.

The IKEA test

If you can follow an IKEA instruction sheet without screaming at the family, you can grow microgreens at a commercial level in Portland. The steps are about that difficulty: open the box, lay out the parts, follow the picture, repeat. Trays are the bookcase. Seed is the dowels.

If you ever did struggle with the IKEA bookshelf, that is exactly why Glappy lives inside the app. Glappy is the in-app coach that breaks every step down barney style, in your own language, from "how do I plant my first tray" to "why is this tray going leggy at day five and what do I do about it tonight." Type the question, get a step-by-step answer. There is no question too basic. The whole point is that a Portland grower starting today is not on their own.

What you are not buying

You are not buying a course. You are not buying a hype product. You are not buying seed from us, and you are not buying trays from us. We do not sell either. Grown Like A Pro is the operating system you run your Portland farm on. The growing happens in your basement.

Try Grown Like A Pro free for 30 days →

Portland microgreen FAQ

How much can I make growing microgreens in Portland?
A working microgreen farm in Portland produces $3,000 to $8,000 per month within 90 days of starting. The math: 100 trays per week, $20 to $30 net revenue per tray, harvested in a basement, garage, or spare room. The ceiling is set by how many restaurants and farmers market customers you can serve, not by the growing setup.
Is it legal to sell microgreens in ME?
Yes. In most of Maine, microgreens fall under the state's cottage food law for direct-to-consumer retail at farmers markets and to private customers. Restaurant wholesale typically requires a basic food handler permit. Verify with the Maine Department of Agriculture before you sign a wholesale contract.
What microgreens sell best in Portland?
Sunflower, pea shoots, and radish are the three highest-volume sellers in nearly every U.S. city, including Portland. Broccoli is the highest-margin variety because of its sulforaphane reputation with health-focused buyers. Specialty varieties like amaranth and shiso command premium pricing from chef-driven restaurants.
How much space do I need to grow microgreens in Portland?
A 10 by 10 foot room with two shelving units holds 60 to 80 active trays, which is enough to produce $3,000 to $5,000 per month. A basement, garage corner, spare bedroom, or sunroom all work in Portland's climate. Vertical shelving is the fastest path to higher revenue per square foot.
What is the best app for tracking microgreen production in Portland?
Grown Like A Pro is the operating system used by working microgreen farms in Portland. It handles seed density math, watering schedules, harvest timing, inventory, customer orders, and the financial side. Free 30-day trial with no credit card.
How long does it take to learn to grow microgreens commercially?
Most growers in Portland are selling their first trays within 30 days of starting. Commercial proficiency, meaning you can run 50-plus trays per week without losing crops to mold or under-seeding, takes 60 to 90 days. The seed density and watering math is the single biggest predictor of how fast you get there.
Do I need a license to sell microgreens in Portland?
For farmers market and direct-to-consumer sales in Portland, most growers operate under Maine's cottage food law with no special license. For wholesale to restaurants and grocery stores, you typically need a basic food handler permit, a sales tax permit, and depending on volume, an inspection from your county health department.
How do I price microgreens to restaurants in Portland?
Restaurant wholesale in Portland runs $1.50 to $2.50 per ounce for standard varieties, $3 to $5 per ounce for specialty varieties like shiso, micro basil, or amaranth. Sell by the pound for repeat accounts. Local fresh commands a premium over the shipped-in product that most Portland restaurants currently buy.

Related guides

Once you have the Portland math in your head, the next read is the density chart that drives every tray you plant.

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