Microgreens

How to Grow Microgreens at Home

Fresh microgreens are one of the quickest and most rewarding ways to start growing food indoors. They need very little space, can fit on a kitchen counter or shelf and may be ready to harvest in as little as one to three weeks, depending on the variety and growing conditions.

Microgreens are young plants harvested shortly after their first leaves develop. They are not the same as sprouts and they are not fully grown herbs or vegetables. Instead, they sit between the two stages: small, tender plants with delicate stems and fresh leaves.

Growing microgreens at home is simple when you give the seeds the right combination of moisture, warmth, airflow and light. This beginner-friendly guide explains how to start germination, what equipment you need and how to keep your microgreens growing until harvest.

What Are Microgreens?

Microgreens are young edible plants harvested when they are still small. Depending on the variety, you may grow pea shoots, sunflower shoots, radish, broccoli, kale, rocket, coriander or other suitable seed types.

They are usually grown densely in a shallow tray and harvested by cutting the stems above the growing medium. Because the plants are young, they can be quick to grow and are a practical choice for anyone who wants a small indoor food-growing project.

Microgreens are different from sprouts because they are generally grown in a growing medium and exposed to light after germination. Sprouts are commonly eaten at an earlier stage and are often grown in water or very moist conditions.

What You Need to Grow Microgreens

You do not need a greenhouse or a large garden. A simple indoor setup can include a shallow tray, suitable seeds, potting soil or a grow mat, water and a reliable light source.

Before You Start: Choose the Right Seeds

Select seeds that are suitable for microgreen growing and follow the supplier’s instructions. Some larger seeds, such as peas or sunflower seeds, may benefit from soaking before sowing.

Avoid using treated ornamental or garden seeds unless they are clearly labelled as suitable for edible growing. If you intend to eat the microgreens, choose a reputable seed source and keep the equipment clean.

Different varieties germinate and grow at different speeds. Radish may appear quickly, while some herbs can take longer and may need more patience. Check the expected germination and harvest timing for the variety you choose.

Step-by-Step Microgreens Germination Guide

Step 1: Soak larger seeds if needed

Some larger seeds, including pea and sunflower seeds, can benefit from pre-soaking. Place the seeds in clean water for approximately six to eight hours, or follow the specific instructions for the variety.

Soaking can help soften the seed coat and may support a more even start. Do not leave seeds submerged for longer than recommended, as stagnant water and poor airflow can increase the risk of problems.

Small seeds often do not need soaking. If you are unsure, check the seed supplier’s guidance before beginning.

Step 2: Prepare the tray and growing medium

Fill a shallow tray with a clean, suitable potting mix, or prepare a grow mat according to the manufacturer’s instructions. The growing medium should be evenly moist but not saturated.

Level the surface gently so the seeds have consistent contact with the medium. Avoid compressing the soil too firmly, as compacted material can make it harder for new roots to develop and for water to drain.

Step 3: Sow the seeds evenly

Scatter the seeds across the surface in a single, even layer. You want good coverage, but avoid creating thick piles of seeds that may restrict airflow.

Press the seeds gently into the surface so they make contact with the damp growing medium. Some varieties benefit from a very light covering, while others germinate best when left close to the surface. Follow the instructions for the seed variety you are growing.

Step 4: Mist and maintain even moisture

Use a clean spray bottle to mist the surface gently. Keep the seeds and growing medium evenly moist while germination begins, but avoid creating puddles or leaving the tray saturated.

Check the tray regularly rather than watering automatically. The growing medium may dry faster in a warm room or under a strong grow light. It may stay moist for longer in a cool, poorly ventilated space.

Bottom watering can help reduce disturbance once the seedlings are established. Add water to the outer tray and allow the growing medium to absorb it, then remove any excess water after the roots have had time to take up moisture.

Step 5: Provide warmth and cover during germination

Many microgreen seeds germinate well in a warm, stable environment. A loose cover or humidity dome can help prevent the surface from drying too quickly during the earliest stage, but it should be removed or ventilated once seedlings emerge.

Good airflow becomes increasingly important as the microgreens grow. If the tray remains covered for too long, excess moisture can encourage mould or fungal problems.

A general germination temperature around 18–22°C can work well for many varieties, but the ideal temperature varies by seed type. Use the supplier’s instructions when available.

Step 6: Turn on the grow light after germination

Once the seedlings emerge, they need light to develop strong stems and green leaves. Place the tray under an LED grow light or in a bright location with suitable natural light.

A grow light can be especially useful during darker seasons, in rooms without a sunny windowsill or when you want a consistent growing cycle. The source document recommends a light period of approximately 12–16 hours per day for microgreens; adjust according to the fixture, seed variety and plant response.

Use a timer so the light switches off automatically and the seedlings receive a regular day-and-night cycle. Keep the light at the manufacturer’s recommended distance to prevent stretching, bleaching or heat stress.

Step 7: Harvest your microgreens

Microgreens may be ready to harvest when they reach approximately 3–7 centimetres tall and have developed their first true leaves, depending on the variety and your preferred texture.

Use clean scissors to snip the stems just above the growing medium. Rinse the harvested microgreens gently if needed and pat them dry before eating or storing them.

Harvest only what you plan to use when possible, as freshly cut microgreens are often best enjoyed soon after cutting. Some varieties may regrow slightly, while others are usually treated as a single-harvest crop.

Why Germination Conditions Matter

Germination is the stage when a seed absorbs water, begins to swell and sends out its first root. At this point, seeds are sensitive to extremes. They need enough moisture to begin the process, but overly wet conditions can reduce airflow and encourage rot.

Temperature also affects the speed of germination. A stable, moderate environment can help create more even growth, while cold conditions may slow the process. Once the seedlings emerge, light becomes essential for strong, green development.

The best approach is to create consistent conditions rather than repeatedly changing the tray. Check the moisture, temperature and airflow once or twice a day, then make small adjustments when needed.

Common Microgreens Germination Problems

Seeds are not germinating

Seeds may fail to germinate because they are old, too dry, too wet, buried too deeply or being grown in unsuitable temperatures. Check the seed instructions, review the moisture level and make sure the tray is not exposed to extreme cold or heat.

Seedlings are tall and pale

Tall, pale or leaning seedlings are often searching for more light. Move them closer to a suitable grow light while following the recommended distance, or place them in a brighter location.

The growing medium is too wet

If water is pooling in the tray or the surface remains saturated, reduce watering and improve drainage. Remove standing water and increase gentle airflow. Constantly wet conditions can encourage mould and root problems.

The surface is drying too quickly

A warm room, strong light or low humidity can dry the growing medium faster than expected. Mist gently or water carefully as needed, and check that the grow light is not too close or generating excessive heat.

Microgreens are developing mould

Mould can be associated with excess moisture, dense sowing, poor airflow or contaminated equipment. Remove affected material, clean the tray thoroughly and review the moisture and ventilation conditions before starting again.

Do not eat microgreens that appear mouldy, have an unpleasant smell or look unsafe. When in doubt, discard the crop and clean the equipment.

Soil or Grow Mat: Which Should You Use?

Potting soil and grow mats can both work for microgreens, but they provide different experiences.

Soil is familiar, widely available and can support a range of varieties. It may be easier to manage for larger seeds and can be composted after use when free from disease and suitable for your local composting system.

Grow mats provide a clean, even surface and can be convenient for indoor setups. They may be made from different materials, so check the manufacturer’s disposal or reuse guidance rather than assuming every mat can be composted.

Choose the option that fits your space, your seeds and your preferred cleanup routine.

How to Keep Growing Microgreens Throughout the Year

Once you have harvested your first tray, start another one before the previous crop is finished. Sowing trays at different times can create a regular supply of fresh microgreens.

Label each tray with the seed variety and sowing date so you can compare germination times and harvest results. Keep notes about the light cycle, watering and room temperature, then adjust your next tray based on what you learn.

A small LED grow light can help maintain a consistent routine when natural light changes throughout the year. Use a timer, keep the fixture clean and adjust its distance if seedlings stretch or show signs of stress.

Frequently Asked Questions About Microgreens and Germination

How long does microgreen germination take?

Germination time varies by seed type and growing conditions. Some microgreen seeds may sprout within a few days, while others take longer. Warmth, moisture, seed age and the growing medium all influence the result.

Do microgreens need a grow light?

They need suitable light after germination. Natural light may work if it is bright and consistent, but an LED grow light can provide more reliable support indoors, especially in darker rooms or during winter.

How often should I water microgreens?

Check the growing medium regularly and keep it evenly moist while seeds germinate and seedlings establish. Avoid watering on a rigid schedule or allowing the tray to sit in standing water.

Can I grow microgreens without soil?

Yes. Some microgreens can be grown on suitable grow mats or other growing media. Follow the instructions for the specific medium and keep the root area moist without making it waterlogged.

When should I harvest microgreens?

Many microgreens can be harvested when they are around 3–7 centimetres tall and have developed healthy leaves. The best timing depends on the variety and the texture you prefer.

Grow Fresh Microgreens in a Small Space

Microgreens are an easy first step into indoor growing. With a shallow tray, suitable seeds, a clean growing medium, careful moisture control and enough light, you can produce fresh greens in a surprisingly small space.

The key to successful germination is consistency. Soak larger seeds when appropriate, sow them evenly, keep the surface moist, provide airflow and introduce light as soon as the seedlings emerge.

Once you harvest your first crop, you may find yourself looking for more trays, more varieties and a permanent place for a grow light in your kitchen.

Start small, keep the conditions steady and enjoy watching your microgreens grow from seed to harvest.