Growing microgreens indoors can be simple: choose seeds sold for sprouting or microgreen production, sow them densely in a shallow tray, keep the medium evenly moist, and move the seedlings into good light after germination. The right setup depends on how many trays you want to grow and how much natural light your space gets. This guide walks through the equipment, timing, light, watering, and harvest decisions that make the process easier to repeat.

Explore indoor growing setups

What equipment do you need to grow microgreens indoors?

A first tray does not require a complex hydroponic system. The core setup is a shallow growing tray, a suitable growing medium or mat, seed intended for microgreens, clean water, and a bright place to grow. A second tray without holes can serve as a catch tray or help with bottom watering. A small spray bottle is useful during germination, while a clean pair of scissors makes harvest easier.

• Growing tray: Use a clean, shallow container that can hold the medium and drain excess water. If you use a tray with drainage holes, set it inside a watertight tray.
• Growing medium: Use a seed-starting medium or a purpose-made growing mat. The medium should hold moisture while allowing excess water to drain.
• Seeds: Select a variety identified for microgreens or sprouting. Start with one crop so you can learn its germination and harvest cues.
• Water: Use potable water and a clean watering can, spray bottle, or other gentle way to moisten the surface.
• Light: A bright window may work for a small batch; an appropriate grow light can make light exposure more consistent in a dim room.
• Harvest tool: Clean scissors or a sharp knife help cut shoots without pulling up the medium.

Match the container to your available shelf or counter space, and make sure you can reach it to water and inspect the seedlings. For people planning several trays, an indoor grow tent can provide an enclosed area, but it is not a requirement for a small home batch. A large flood tray such as this low-rise tray is a different scale from a typical small microgreen tray; check its dimensions and intended use before deciding whether it fits your setup.

How should you choose seeds, trays, and growing medium?

Choose a seed variety you actually want to eat and check the packet for sowing and harvest guidance. Common beginner choices include radish, broccoli, peas, and sunflower, but crops differ in seed size, germination behavior, flavor, and time to harvest. Some seeds have hulls or benefit from soaking, while others should be sown dry. Follow the seed supplier's directions rather than applying one method to every crop.

Use seed sold for edible sprouts or microgreens, and follow package handling directions. Do not use treated garden seed unless its label specifically says it is suitable for edible use. Begin with one variety, then add another in a separate tray after you understand the first crop's needs. Different seeds may germinate and mature at different rates, which makes a mixed tray harder to manage consistently.

For a small tray, a fine, even layer of growing medium gives roots room to anchor. Pre-moisten it before sowing so it is damp throughout but not waterlogged. A compressed coco growing medium is one possible material; prepare and use any medium according to its product directions. Do not assume every medium needs the same preparation or nutrient treatment.

Many home growers use a reusable plastic tray. Whichever container you select, wash it between crops and make sure surplus water can drain or be removed. Avoid containers that have held chemicals or other materials unsuitable for food growing. If using trays with holes, a watertight tray underneath helps catch runoff and makes bottom watering possible.

What is the basic process from sowing to harvest?

1. Clean the work area and equipment. Wash hands, trays, and tools before starting. Use clean containers and fresh medium for each batch.
2. Prepare the medium. Add it to the tray and moisten it evenly. It should feel damp, not saturated, and water should not pool on the surface.
3. Sow the seeds. Spread seeds in an even layer, following the packet's guidance for that variety and tray size. Aim for coverage without large clumps. Crowding can limit airflow, while sparse sowing leaves unused space.
4. Set up germination. Some varieties are covered or kept in darkness briefly; others have different needs. Use the seed directions. If you cover a tray, check it regularly and remove the cover when the shoots begin to emerge as directed.
5. Move emerging shoots into light. Once the seeds have germinated, give seedlings suitable light and airflow. Rotate the tray if one side consistently receives more light.
6. Check moisture each day. Water gently when the medium begins to dry. If the tray has drainage holes, add water to the catch tray and let the medium draw it up, then pour away excess. Do not leave the roots sitting in standing water.
7. Harvest when the crop is ready. Follow the variety's guidance and inspect the shoots. Use clean scissors to cut above the medium, then rinse or store the harvest as appropriate for your food-safety routine.

University of Maryland Extension describes the basic microgreen setup as seeds, reusable food-grade containers or trays, growing media, and water. Its overview is a useful starting point when assembling a small indoor batch: Growing Microgreens and Baby Greens Indoors.

How much light do indoor microgreens need?

Light affects how compact and sturdy shoots grow. A bright window can be enough for some small batches, but daylight changes with the season, window direction, and nearby obstructions. If seedlings lean strongly toward a window or grow pale and stretched, improve their light exposure. Rotate the tray or use an indoor grow light suited to the crop and growing area.

University of Illinois Extension says microgreens need about six to eight hours of light per day for optimal growth and notes that a south-facing window or LED lighting can be an option. Treat this as a useful general reference, not a fixed rule for every setup: light intensity and distance matter as well as the time the light is on. See its guidance on growing microgreens indoors.

With a grow light, follow its manufacturer instructions for distance, coverage, and operating schedule. Keep the fixture secure and cords away from water. Check seedlings after changing the height or schedule: excessive heat or drying can stress a tray, while weak or uneven light can lead to leggy growth. A hanging hook system is relevant only if your fixture and location are designed for a suspended installation. Do not assume a particular hook or fixture is compatible without checking the product details.

How do you water without making the tray too wet?

Microgreen roots need moisture, but a saturated tray can create poor growing conditions. Check the medium rather than watering by the clock. If the surface is drying, apply a gentle mist or add a small amount of water through the tray below. If water remains pooled, remove it. Frequent heavy spraying can displace seeds, while letting the medium dry completely can interrupt growth.

A small hand sprayer can help moisten the surface gently; for example, compare the capacity and spray pattern of a hand sprayer with the size of your tray. It is not necessary to use a large sprayer for a small crop. Keep watering tools clean and use them only for their intended purpose.

Bottom watering can reduce disturbance after roots have formed. Add water to the watertight tray, wait for the medium to draw up some moisture, and pour away any remainder. The time needed varies with the tray, medium, and crop, so inspect the medium instead of relying on a universal number of minutes. Make moisture checks part of a quick daily routine. Look at the tray edges as well as the center, since exposed edges can dry sooner. Lift one corner of the growing tray to check whether water remains in the catch tray, and empty it if it is still pooled after the medium has absorbed what it needs. Note whether you misted or bottom-watered and how the shoots responded. A few simple observations can help you adjust the next watering rather than adding water automatically. Use a clean water container; a covered water-storage bucket lid is one option for keeping a reservoir covered, though a small batch may need only a clean household vessel.

How long do microgreens take, and when are they ready?

There is no single harvest date for every variety. Seed type, room conditions, light, and the growing method all affect development. Purdue Extension notes that microgreens are often harvested within roughly 7 to 21 days; use that range as orientation, not a promise for a specific seed lot. Penn State Extension's step-by-step guide to growing microgreens at home offers another useful reference. Check the packet, then judge the plants by their development.

Harvest when the shoots have developed enough for the intended use and are easy to cut cleanly. Many crops are cut after their first leaves have opened, but timing and appearance vary by variety. If the tray looks uneven, some shoots may be ready before others. Cut a small sample to assess flavor and texture, then harvest the rest when it suits your preference. For a steady supply, sow a new tray after you have learned the first crop's timing rather than starting several varieties at once. Mark each tray with its variety and sowing date, and keep it separate from trays at another stage. This makes it easier to keep watering and harvest decisions matched to each crop. If you are growing just for one meal, harvest only what you plan to use and handle the remaining crop with clean tools.

Use clean scissors and avoid cutting into the medium. Remove any seed hulls or damaged material you notice. Handle the harvest as food: rinse if appropriate for your routine, dry it well, and refrigerate promptly in a clean container. Discard any crop with signs of spoilage, and clean the tray before starting again.

Which growing option fits your space?

Choose a setup based on batch size, light, and how much maintenance you want. A simple tray is usually the easiest way to learn. More equipment can help with repeatability, but it also adds setup and cleaning.

For growers considering a larger enclosed space, reflective lining such as reflective fabric may be relevant to a broader indoor setup, but it is not needed to start microgreens. Evaluate the measurements and intended use before buying. The simplest useful setup is the one that gives you access to the tray, appropriate light, and a way to manage runoff.

What common problems should you watch for?

• Seeds are slow to emerge: Check the variety's germination instructions, sowing depth, and moisture. Avoid repeatedly soaking the tray to hurry it along.
• Shoots are long and leaning: Improve or even out light exposure. Rotate the tray if light comes from one direction, and check that the light is positioned according to its instructions.
• Seeds or shoots look crowded: Adjust the sowing density on the next tray. Use the packet's recommendations and spread seed as evenly as possible.
• Medium stays soggy: Improve drainage, remove standing water, and water less heavily. Check that the catch tray is not holding runoff against the roots.
• Surface looks dry soon after watering: Check the medium below the surface and adjust the way you water. Small, frequent surface misting is not always enough to moisten the root zone evenly.
• Growth differs within one tray: Uneven seed distribution, light, or moisture may be responsible. Use a level surface and inspect the whole tray, not just its center.

Keep the grow area clean and allow trays to drain. If you see an unusual odor, slimy growth, or other signs of spoilage, do not eat the affected crop. Empty and clean the tray, then review the seed handling, airflow, watering, and sanitation steps before restarting.

Browse indoor growing equipment

Frequently Asked Questions

Can you grow microgreens without soil?

Yes. Some growers use a suitable growing mat instead of a soil-based medium. Follow the mat and seed instructions, and make sure the tray drains or that you can remove excess water. The choice is a matter of setup and handling, not a requirement to use a particular material.

Do microgreens need nutrients?

For a short home crop, start with the seed supplier's instructions and the directions for your chosen medium. Do not add nutrients automatically or assume all crops and growing media use the same recipe. If the product instructions call for an input, follow its label and use it only as directed.

Can a sunny window provide enough light?

It can work for a small batch when the window provides bright, consistent light. If shoots stretch or lean, or growth is noticeably weak, adjust the tray's position or consider a suitable grow light. Conditions vary with the season and the window.

Can you reuse a tray?

Reusable trays can be used again if they are food-safe, intact, and cleaned between batches. Remove plant debris, wash the tray, and let it dry before filling it again. Replace containers that are cracked or difficult to clean.

What is the simplest way to begin?

Start with one variety, one clean shallow tray, and a small amount of suitable medium. Follow the seed directions, give seedlings adequate light after germination, and check moisture daily. Record the sowing date and what you observe so the next batch can be adjusted.

Microgreens are easiest to manage when you keep the first setup small and make one change at a time. With clean trays, suitable seed, balanced moisture, and enough light, you can learn what works in your space and decide whether you want to add more trays.