Microgreens are one of the easiest crops to start growing indoors, but “easy” doesn’t mean
that every tray will succeed automatically.

The first tray usually teaches you more than any chart can: how quickly the medium dries,
how densely you should sow, how much airflow your setup needs, and when your crop is actually
ready to cut.

The good news is that the basic process is straightforward.

You need a shallow tray, a suitable growing medium, good-quality seed, water, and adequate
light. Depending on the crop and your setup, a microgreen crop can go from sowing to harvest
in roughly one to three weeks.

This guide walks through the entire process, from preparing your first tray to harvesting it
and planning the next one.

What Are Microgreens?

Microgreens are young vegetable and herb seedlings harvested while they are still small.
Depending on the crop and growing conditions, they are commonly harvested around the cotyledon
stage or as the first true leaves begin to emerge.

They are different from sprouts.

Sprouts are usually germinated under very moist conditions and are eaten as the whole young
plant, including the seed and root. Microgreens are generally grown in a growing medium or
on a suitable mat and are cut above that surface at harvest.

That distinction matters because the growing methods, harvest process, and food-safety
considerations are different.

What You Need to Grow Microgreens

You don’t need a greenhouse or a complicated hydroponic system to grow your first tray.

A basic setup consists of:

A 1020 tray is a common commercial reference size, but don’t assume that every tray has the
same growing area. Seed rates and yield figures need to be tied to the actual tray size and
growing method being used.

Choosing Your First Microgreen Crop

For a first tray, choose a crop that is relatively forgiving and has a short production cycle.

Brassica crops such as broccoli, kale, cabbage and radish are commonly used for microgreens,
while peas, sunflower and herbs are also popular.

For beginners, broccoli, radish and pea microgreens are particularly useful
crops to learn because each teaches something slightly different.

You can explore those crops in our Crops section.

One Important Rule

Don’t mix several species into one tray just because they look good together.

Different crops can have different germination speeds, seed sizes, water requirements and
harvest timing. Grow one crop first. Learn its behavior. Then experiment.

Step 1: Prepare Your Tray and Growing Medium

Start with a clean, shallow tray.

For a soil-based setup, fill the tray with a suitable growing medium to roughly
1 to 1½ inches deep.

Level the surface instead of leaving hills and holes.

Then moisten the medium evenly.

You want it damp enough to support germination, but you don’t want a tray that is saturated
with standing water.

The structure of the medium matters because roots need both moisture and air.

The Beginner Mistake

Don’t pack the medium down like you’re building a road.

A firm, level surface is useful. Excessive compression reduces the amount of pore space
available for air and water movement.

Step 2: Measure and Sow Your Seeds

This is where many first-time growers get into trouble.

“Sprinkle the seeds generously” is not a very useful instruction.

Seed size, crop, tray area and seed lot all matter, so there isn’t one universal
grams-per-tray number for every microgreen.

We recommend measuring the seed rather than guessing.

Spread it as evenly as you can across the surface.

You are aiming for a fairly complete stand without creating a thick, wet mass of seed
and seedlings.

Why Density Matters

Too little seed can leave large gaps and reduce the useful output from the tray.

Too much seed can create a dense canopy that holds moisture and restricts airflow.

The sweet spot is crop-specific.

For your first few trays, keep notes:
crop → tray size → grams of seed → harvest weight → problems.

Step 3: Water and Cover for Germination

After sowing, water gently.

The goal is to keep the seed and growing medium evenly moist without washing seeds into piles.

Bottom watering or gentle watering can help reduce disturbance and maintain even moisture.

Some growers cover the tray during germination using a humidity dome, another tray,
or another appropriate cover.

The purpose is to maintain a suitable humid environment while the seeds establish.

The important part is not to leave your crop sealed indefinitely.

As germination progresses, the tray needs appropriate air exchange and eventually light.

Step 4: Manage the Germination / Blackout Period

The early stage is about getting the seedling established.

The exact procedure varies by crop. Some crops benefit from being covered during germination,
while some larger seeds have different preparation requirements.

Don’t treat a single blackout schedule as a universal law.

Follow the crop-specific seed instructions when available.

Once the seedlings have germinated and are ready for light, move them into the growing phase.

A common mistake is keeping the crop covered because the seedlings appear to be growing well
underneath the cover.

That can become a problem if humidity and temperature rise too far.

Step 5: Move the Tray Into Light

Once the seedlings are established, they need adequate light.

Microgreens can be grown indoors under grow lights or using suitable natural light.

You are looking for short, sturdy, healthy growth, not long pale stems
reaching desperately toward a window.

Poor light can contribute to stretched, weak growth.

Natural Light or Grow Light?

For a hobby tray, a bright suitable location may work.

For repeatable production, controlled supplemental lighting is generally easier to manage
because the light conditions become less dependent on the season and location.

Step 6: Manage Water, Airflow, and Temperature

This is where growing microgreens becomes less about “watering plants” and more about
managing a small production environment.

Keep the growing medium evenly moist.

Don’t let it repeatedly dry out.

But also don’t keep the tray excessively wet.

Dense crops, saturated growing media and poor air circulation can increase disease problems.

Temperature matters too.

A generally favorable ambient range for many microgreens is around
65–75°F (18–24°C), although requirements vary by variety and setup.

Watch the Tray, Not Just the Thermometer

If the crop looks wet for too long, smells unusual, develops fuzzy growth, or collapses at
the base, don’t simply add more water because “microgreens need moisture.”

Check:

watering → airflow → density → temperature → cleanliness

Those variables interact.

Step 7: Know When Your Microgreens Are Ready

There isn’t one universal harvest day.

Many microgreens are harvested within roughly 7–21 days, although
crop and variety differences can extend that window.

Instead of relying only on the calendar, look at the plant.

Depending on the crop and your preferred product, you’re generally looking for developed
cotyledons and/or the emergence of the first true leaves.

Don’t chase maximum size blindly.

A larger tray isn’t automatically a better tray.

The longer a crop remains in production, the more its quality, texture, appearance and
market suitability may change.

Your best harvest point depends partly on what you’re selling and how the crop
is being used.

Step 8: Harvest

When the crop reaches your chosen harvest stage, use a clean, sharp pair of scissors or knife.

Cut the stems just above the growing medium.

Don’t pull the plants out by their roots if your finished product is meant to be clean-cut
microgreens.

Record the Harvest

This is one habit I’d strongly recommend to anyone planning to grow more than a couple of trays.

Record:

seed weight → sowing date → harvest date → harvest weight → unsellable portion

That gives you your own production data.

Step 9: Clean, Store, and Start the Next Tray

Fresh microgreens are highly perishable.

After harvest:
handle gently → cool appropriately → package appropriately → refrigerate as needed.

Then clean the tray and prepare it for the next crop.

Keeping a consistent cleaning and preparation routine makes repeat production much easier to manage.

How Long Do Microgreens Take to Grow?

For planning purposes, think in ranges, not promises.

These are planning categories, not guaranteed harvest schedules. Species, variety and
environmental conditions can substantially change the timeline.

This is also why our crop guides use crop-specific information rather than one giant
universal “microgreens chart.”

Common Microgreen Problems and How to Fix Them

Mold or Fuzzy Growth

Start by checking:

Was the seed sown too densely?
Is the tray staying excessively wet?
Is there enough airflow?
Was clean media and water used?

Leggy, Pale Seedlings

Check the light.

Insufficient light can produce stretched growth. Move the tray to a better-lit location
or use an appropriate grow light.

Patchy Germination

Check:

seed quality → sowing uniformity → moisture → temperature → seed density

Seeds Haven’t Germinated Evenly

Don’t immediately assume the seeds are bad.

Consider whether:

• the medium dried out;
• the temperature was inappropriate for that crop;
• the seed was covered too deeply;
• the seed was distributed unevenly;
• the crop naturally has slower germination.

Beginner Mistakes That Waste Trays

1. Guessing the Seed Quantity

Measure it.

2. Using the Same Seed Rate for Every Crop

Seed size and crop characteristics differ dramatically.

3. Overwatering

Moist does not mean saturated.

4. Ignoring Airflow

A dense canopy needs appropriate air movement.

5. Growing Too Many Varieties Immediately

Learn one crop first.

6. Waiting for a Calendar Date

Harvest stage varies. Look at the plants.

7. Never Weighing Your Harvest

Without a harvest weight, you’re guessing about yield.

8. Ignoring Your Actual Production Cost

A beautiful tray isn’t necessarily a profitable tray.

That’s why we built the
Cost Per Tray Calculator.

How to Scale From One Tray to Regular Production

Once you can consistently produce one tray, the next question isn’t:

“How do I grow 100 trays?”

It’s:

“What does one reliable tray cycle look like?”

Start with one crop and record:

• Seed used
• Sowing date
• Harvest date
• Harvest weight
• Losses
• Production cost
• Selling price

Then repeat the same crop.

Once you understand your own numbers, scaling becomes a planning problem rather than a guessing problem.

What Does One Tray Actually Cost?

This is where growing and business begin to separate.

Your production cost isn’t necessarily just:

seed + soil

Depending on your operation, you may also have:

labor → electricity → water → packaging → equipment → cleaning → waste/losses → overhead

And if 20 trays are planted but only 18 become sellable, your economic calculation should
reflect the sellable output, not simply the number originally planted.

Use the
Cost Per Tray Calculator
to calculate your own numbers rather than copying someone else’s cost estimate.

From Growing to Production Planning

The biggest transition for a new grower is moving from:

“I can grow microgreens.”

to:

“I can produce them consistently.”

That means understanding the relationship between:

seed → trays → grow cycle → losses → harvest → capacity → selling volume

For example, if your target is 100 sellable trays, your crop takes 10 days, and you have
space for 40 trays at a time, you need to think about how many production cycles and trays
per cycle are necessary.

Our
Production Planner
can turn those assumptions into a simple production plan.

And once you know your cost and selling price, the
Profit Margin Calculator
can show how those numbers translate into margin.

A Simple First-Tray Checklist

Before Sowing

• Clean tray
• Suitable growing medium
• Suitable seed
• Measured seed quantity
• Water ready
• Light available
• Airflow considered

During Germination

• Medium remains evenly moist
• Seeds remain distributed
• Temperature is reasonable
• Cover is managed appropriately

During Growth

• Adequate light
• Appropriate watering
• Good airflow
• No obvious signs of disease
• Crop is developing evenly

At Harvest

• Correct harvest stage
• Clean cutting tool
• Cut above growing medium
• Record harvest weight
• Cool/store appropriately
• Clean tray for next cycle

Frequently Asked Questions

Can I Grow Microgreens Without a Garden?

Yes. Microgreens can be grown indoors, including in home environments, provided you have
suitable containers, growing media, moisture and adequate light.

How Long Do Microgreens Take to Grow?

Many microgreens are harvested within roughly 7–21 days, although crop and variety differences
can extend that window.

Do Microgreens Need Soil?

No. Microgreens can be produced using soil-based or soilless media, including various
hydroponic growing mats.

Do Microgreens Need a Grow Light?

Not always. Suitable natural light can work, but supplemental lighting can make indoor
production more consistent, especially when natural light is insufficient.

How Often Should I Water Microgreens?

There isn’t one watering schedule that works for every setup. The goal is to maintain
even moisture without keeping the medium excessively wet.

What Is the Best Microgreen for Beginners?

There isn’t one universal “best” crop. Broccoli and radish are useful beginner choices,
and pea microgreens are another popular option. Crop choice should consider grow time,
seed requirements, intended market and your growing conditions.

Are Microgreens the Same as Sprouts?

No. Microgreens are generally grown in a medium and harvested above it, while sprouts are
harvested much earlier as whole germinated seedlings.

A Note About Food Safety

Because microgreens are consumed as fresh produce, hygiene and handling deserve more attention
than they often receive in beginner gardening content.

For commercial growers, check the food-safety requirements that apply to your location and
sales channel rather than treating a home-growing checklist as regulatory advice.