How to Grow Microgreens Indoors: A Complete Guide for Beginners

Knowing how to grow microgreens lets you enjoy fresh greens every week. You just need a shallow tray, seeds, soil or a growing mat, and light. The process only takes about 7 to 14 days, making it fast and rewarding.

Soak seeds for 2 to 3 hours first. Then spread them evenly over moist soil or growing medium.

Keep the seeds covered and dark for a day or two to help sprouting. Once the seeds sprout, expose them to light to encourage healthy growth.

Watch your microgreens closely as they grow. Keep the soil moist but not soggy.

Harvest when they reach 2 to 3 inches tall and show their first true leaves. Cutting them with scissors just above the soil keeps the roots intact for a fresh taste.

What Are Microgreens and How Do They Differ from Sprouts?

Microgreens are small, edible young plants harvested shortly after germination. They usually measure 1 to 3 inches tall and show their first true leaves.

You cut them with scissors less than a month after sprouting. Usually, this is 7 to 14 days depending on the type.

They differ from sprouts, which are harvested much earlier, typically within 48 hours. Sprouts don’t grow true leaves. They usually grow without soil.

Water or damp conditions are used instead. Microgreens grow in soil or a soilless mix. They need more light and good air flow.

Microgreens are more than just baby plants; they’re young seedlings with early leaf growth. Baby greens are picked at 20 to 24 days with mature leaves.

Microgreens are harvested earlier when they’re more tender. This early harvest gives microgreens a mix of fresh flavor and concentrated nutrients.

You find microgreens used in salads, sandwiches, garnishes, and smoothies. Their vibrant colors and stronger taste add more bite than sprouts or mature greens. They grow fast indoors.

You can get fresh greens year-round on your counter. You only need a small tray and seeds.

Microgreens need enough space and light. LED grow lights usually hang 4 to 6 inches above them. After seeds sprout, keep them in darkness for 1 to 2 days to stretch stems.

Then, give 16 to 17 hours of light daily for leaf growth. The process takes about 7 to 14 days until you can harvest with scissors.

Microgreens include many types like cabbage and collard greens. They bring unique flavors and bright colors.

Using a small tray and mineral-enriched water instead of soil is common for hydroponic growing. This method fits perfectly on a kitchen counter without needing outdoor space.

Essential Materials Needed to Grow Microgreens at Home

Start with shallow seed trays designed for microgreens. These trays are usually 10×20 inches and 1 to 2 inches deep. They allow good drainage and are simple to stack for multi-tier growing.

You can use indoor potting soil, coconut coir, or hemp mats as a growing medium. Soil holds nutrients well, while coco coir stays clean and drains quickly. Hydroponic mats work for soilless setups, but many beginners find soil more forgiving.

Natural light from a bright window often suffices. But a proper grow light helps if light is weak or inconsistent.

LED grow lights with a 6500K color temperature mimic daylight and encourage steady growth. Position the light 12 to 18 inches above your trays, running 12 to 16 hours daily.

• Multi-tier trays or 10×20 seed trays with drainage holes
• Potting soil, coco coir, or hydroponic mats as growing medium
• Quality microgreen seeds, like kale, radish, or sunflower
• LED grow light (12-16 hours daily) if natural light is limited
• A spray bottle for gentle watering of seeds
• Small fan to improve air flow and reduce mold risk
• Humidity dome or plastic cover for seed germination (optional)

Choose seeds suited for beginners, such as radish or sunflower. Some harder seeds, like beet, benefit from a light cover of coco coir to assist germination. Watering gently with a spray bottle avoids disturbing delicate seedlings.

Keep your microgreen trays airy with a small fan to avoid mold and encourage strong stems.

Repurposed containers like pie tins or takeout trays can substitute for commercial seed trays. Just make sure they provide drainage unless growing hydroponically.

The tray choice affects drainage and ease of cleaning. So pick one that fits your space and routine.

A multi-tier setup saves space for your indoor garden. It helps you grow many plant varieties during the whole year. This keeps your garden neat and organized.

These usually come with built-in LED lights and cost around $50 to $150. That upfront cost can be worth it if natural window light isn’t enough.

Step-by-Step Process to Plant and Grow Microgreens

Growing microgreens starts with preparing the seeds properly. Plant them on the right growing medium. Cover the seeds to help them sprout, then give them enough light and water.

Seeds usually sprout in 2 to 3 days. After that, you keep the seedlings under lights and water as needed until harvest.

Preparing and Soaking Seeds

Start by choosing quality seeds for quick, even germination. Most microgreen seeds don’t need soaking. But larger ones like sunflower and pea do well with it.

Soak these bigger seeds in water for 8 to 12 hours. This boosts their chances of sprouting and speeds up germination. Smaller seeds usually skip this step and go directly to planting.

Planting and Covering Seeds

Fill your tray with 1 to 1.5 inches of loose, well-draining growing medium. Coco coir and commercial potting mixes are good choices for healthy growth.

Scatter seeds evenly but do not bury them. Most microgreens like broccoli or radish only need to touch the surface, no covering needed. For best results, avoid pushing seeds into the soil.

Cover the tray with a humidity dome or another tray to create darkness and trap moisture. Keep the seeds covered until they sprout, usually 2 or 3 days.

Lighting and Watering Schedule

After seeds sprout, take off the cover. Move them to a grow light or a bright window.

This helps the plants grow strong and healthy. About 12 to 16 hours of indirect light daily helps microgreens grow strong and develop color.

Water lightly to keep the soil moist but never soggy. Bottom watering works well, add water to a tray underneath, letting the medium soak it up. This prevents mold and keeps roots healthy.

Check moisture daily. Dry soil slows growth, but too much water invites problems like damping off disease.

Germination and Early Growth Care

Keep the temperature steady between 75 and 85°F for the best germination. Humidity should stay around 50% or lower to prevent mold.

After seeds sprout and the first leaves appear, keep lights on steadily and water as needed. Avoid overwatering by feeling the soil with your fingers daily.

Spots or slimy patches mean you need less water. Also, increase the airflow around your microgreens.

Healthy microgreens grow 1 to 3 inches tall in 7 to 21 days. At this stage, you don’t need extra fertilizer.

1. Soak larger seeds (sunflower, pea) for 8 to 12 hours before planting.
2. Fill a tray with 1 to 1.5 inches of loose growing medium like coco coir.
3. Scatter seeds evenly on top; don’t bury them.
4. Cover the tray with a dome or lid to keep seeds moist and dark.
5. Keep covered for 2 to 3 days until seeds sprout.
6. Remove the cover once sprouts appear and provide 12 to 16 hours of light daily.
7. Water from the bottom to keep soil moist but not soggy.
8. Maintain 75 to 85°F and moderate humidity; watch for mold or drying soil.

Choosing the Best Microgreens to Grow for Flavor and Speed

Broccoli and radish microgreens tend to be the easiest and fastest for beginners. They grow well indoors and have a mild to peppery flavor. Broccoli offers a tender texture, while radish adds spiciness and crunch.

Microgreens generally take between 7 and 14 days to reach harvest size. Your greens should be 2 to 4 inches tall with their first true leaves before clipping. Fast-growing types like arugula and pea shoots add spicy or sweet flavors quickly to any dish.

Pea shoots are affordable and very easy for beginners if you’ll soak the seeds six hours. They have a crunchy texture and sweet flavor that works well in salads. Kale microgreens are mild and packed with nutrients but take slightly longer to harvest.

Basil and cilantro microgreens take the longest to grow but add bold flavors. Basil costs more and needs more light and warmth before it’s ready. Cilantro grows slowly and sometimes needs extra care to prevent leggy stems.

How to Harvest, Store, and Preserve Your Microgreens

Microgreens are usually ready to harvest after 7 to 10 days. This is when their first true leaves appear. Some varieties, like radish, may be ready as soon as 5 days.

Sunflower or pea shoots require about 10 to 14 days. Cut them just above the soil line with sharp scissors to avoid damaging the stems below.

To harvest, hold a small bunch of microgreens steady with one hand. Use clean, sharp scissors in the other hand to snip the greens above the soil.

Avoid pulling or tearing to keep roots and soil intact for cleaner harvesting and easier cleanup. Microgreens won’t regrow well after cutting, so plan your harvest accordingly.

Wash microgreens gently in cool water right before use to avoid wilting or decay. Place them in a colander and rinse softly, then spin or pat dry using paper towels.

Excess moisture can speed up spoilage, so drying well is key. Store microgreens in a sealed container lined with a dry paper towel to absorb moisture.

Keep your harvested microgreens in the refrigerator at about 34 to 40°F for best freshness. Do not wash them before storing, as moisture promotes molding. Use an airtight container with a paper towel inside.

This helps keep microgreens crisp for up to a week. Check them daily and remove any wilted leaves promptly.

Freezing microgreens is generally not ideal since they lose texture and flavor once thawed. To freeze microgreens, blanch them first by dipping in boiling water for 10 seconds. Then cool quickly in ice water.

Drain and dry well before freezing in a sealed bag. Frozen microgreens are best used in cooked dishes rather than fresh salads.

Always use sharp scissors to harvest microgreens. Blunt tools crush stems and reduce shelf life.

Common Problems and How to Fix Them When Growing Microgreens

Mold is one of the biggest problems in microgreen trays. It happens mostly when you overwater or when airflow is poor. To stop mold, water from the bottom using a shallow container.

Place your tray in the water for 10 minutes. Let the tray absorb water through its base.

This keeps the soil moist without soaking the seeds. Also, mist seeds with a 3% hydrogen peroxide solution before watering to kill mold spores.

Leggy, tall microgreens often mean they’re reaching for light. This stretching happens with uneven natural light, like from a single window. Put a small fan nearby to strengthen stems and keep air moving.

Use a grow light or rotate the tray to prevent leaning. Keep microgreens between 1 and 2 inches tall before harvesting for best taste and texture.

Uneven or slow germination can come from sticky, mucilaginous seeds clumping in wet soil. Scatter seeds evenly, and use a growing mat to help spread moisture without clumping. Test your seeds by spreading 10 to 20 on a wet paper towel.

Keep the towel moist for 2 to 4 days. Watch how many seeds sprout in that time.

Switch to fresh seeds if only a few start to sprout. New seeds usually give better growth results.

• Clean trays and tools before planting to prevent disease.
• Avoid soaking soil by watering only when the top feels dry.
• Use well-draining soil or mats to stop sogginess.
• Give microgreens 12-16 hours of light to avoid legginess.
• Keep temperatures between 60°F and 75°F for steady growth.
• Fix yellowing by checking watering habits and adding a mild nutrient spray.
• Use fans to improve airflow and reduce mold risk.

Yellow leaves or stunted growth usually point to nutrient issues or overwatering. Microgreens generally get enough nutrients from seeds. But poor soil or waterlogged roots can cause yellowing.

Feed your plants with diluted liquid fertilizer if they look weak. Start this after the first week of growth.

Use a gentle mix so you don’t harm them. Also, watch your watering, too much water suffocates roots and invites mold.

Soil vs. Soilless Growing: Which Medium Is Best for You?

Soil and soilless media each offer good options for growing microgreens indoors. Soil adds nutrients and structure.

Soilless choices like coco coir and hydroponic mats simplify watering and cleanup. Your space, budget, and preference for yield or ease will guide your choice.

Traditional Soil Growing

Using potting soil or garden soil mixes works well for microgreens. Soil holds water and nutrients naturally, so you don’t need extra feeding. It also tends to add a fresher, earthier flavor to your greens.

Watering soil requires attention to avoid overwatering, which can cause mold. Soil is compostable after harvest but not reusable unless sterilized. It’s a good choice if you want a natural, low-tech approach.

Coco Coir and Peat Alternatives

Coconut coir is a popular soilless growing medium made from coconut husks. It holds moisture evenly and drains better than soil, reducing the risk of soggy roots. Peat alternatives work similarly but can be less sustainable.

Coir is lightweight and reusable with rinsing between grows. It’s often less messy and easier to compost than soil. You may need to add nutrients, as coir alone has low nutrient content.

Hydroponic Mats and Soilless Options

Hydroponic mats made from hemp or fiber are another option. These mats come infused with nutrients and provide a clean surface that roots can latch onto. Mesh trays help roots grab hold and make harvesting easier.

They require less watering than soil because the mats wick moisture up evenly. These mats are reusable, especially silicone grow mats rated for 20 to 30+ cycles. Hydroponic setups produce consistent yields quickly but may lack the soil taste many enjoy.

Choosing the Right Medium for Your Space

Space and setup matter when choosing a medium. Soil takes more room since it can be heavier and messier. Hydroponic mats fit tight spaces and stack easily.

For beginners, hydroponic mats or coco coir simplify the watering routine. If you want to compost or reuse your medium, coir and mats offer easier cleanup. Soil suits gardeners who prefer natural methods and are okay with more maintenance.

Here’s a quick comparison to help decide:

Matching your schedule with watering needs works best. Soil demands more hands-on care due to mold risks from excess moisture. Hydroponic mats need less water but might cost more upfront.

Think about what tastes you want too. Soil offers earthy flavors, while hydroponic and coir give a cleaner, sometimes milder taste. For frequent growers, reusable mats save money and waste over time.

Light, Temperature, and Water Needs for Healthy Microgreens Indoors

Microgreens need 12 to 18 hours of light every day. Keep the temperature around 70°F. Water carefully to keep the soil moist, not wet.

Managing humidity around 40% to 60% helps avoid mold. Using quality grow lights and watering twice daily usually gives strong, healthy growth indoors.

Recommended Daily Light Hours

Microgreens need between 12 and 18 hours of light a day for fast, sturdy growth. Less than 4 hours boosts weak, leggy stems. Keep your grow lights on for 18 hours a day.

Turn them off for 6 hours. This mimics a natural day and night cycle.

You can adjust light hours slightly depending on your microgreens type. For example, mustard microgreens thrive closer to 14 hours, while sunflower might want more. Try a consistent lighting schedule to avoid stressing your plants.

Best Types of Indoor Grow Lights

Full-spectrum LED grow lights work best indoors to provide the right color and intensity for microgreens. They don’t heat much, so they keep your setup cooler. The Vego Garden 4-Tier Indoor Gardening Grow Light is good for home use.

It has adjustable shelves. You can also change the brightness.

Place lights about 12 inches above your trays for even coverage. Rotating trays daily helps microgreens grow straight toward the light.

Natural sunny windows work but often don’t provide enough hours or uniform light. So artificial lights are usually better.

Ideal Temperature and Humidity Levels

Temperatures between 65°F and 75°F support the fastest growth without stressing microgreens. Temperatures above 80°F risk drying them out too fast.

Below 60°F slows growth sharply. Adjust your room heat or use a small heater if needed.

Keep humidity near 50 percent to prevent mold but avoid overly damp conditions. Use a blackout humidity dome to keep moisture early on. Take it off once seedlings show up.

This helps them grow well. Good airflow around trays also reduces mold risk.

Watering Techniques and Timing

Water microgreens twice each day with a fine mist. You can also water from the bottom. Keep the soil moist without soaking it.

Use seedling trays with drainage holes and a shallow water tray underneath to avoid soggy soil. Soil that stays wet or flooded invites mold and falling stems.

Check moisture by touching the soil surface; it should feel damp, not dripping. Misting once a day can help increase humidity without soaking soil. If you see mold, try watering less.

You can also use a weak hydrogen peroxide mix. Use 2 tablespoons of 3% food-grade peroxide per 1 liter of water.

Keep soil moist daily, but avoid flooding your trays. Soggy soil causes mold and weak stems.

Step-by-Step Action Plan to Start Growing Microgreens Today

Follow this simple plan to get your first batch of microgreens growing fast. Each step shows what to do and how to tell if it worked.

1. Day 1: Choose seeds like radish or sunflower for quick growth. Seeds should look healthy and full.
2. Day 1: Prepare your growing medium, soil or a soilless mat. It should feel moist but not soggy.
3. Day 2: Spread seeds evenly in a shallow tray. Cover them lightly with soil or a thin layer.
4. Day 3-4: Place the tray in a warm spot with indirect sunlight. Watch for seeds to sprout.
5. Day 5-7: Begin watering gently once daily to keep soil moist. Avoid overwatering; no standing water.
6. Day 7-14: Move trays into direct light or under a grow light for 12-16 hours daily. Watch for healthy green leaves.
7. Day 10-14: Harvest when leaves look full and sturdy. Use scissors to cut just above the soil line.
8. After Harvest: Store microgreens in a sealed container in the fridge. They should look fresh and stay crisp for days.

Frequently Asked Questions

Can You Reuse Soil to Grow Microgreens Again?

You can reuse soil once if it’s healthy with no mold. Let it dry completely between uses to avoid root rot or disease. Fresh soil is best for strong growth and fewer problems.

Do Microgreens Need Fertilizer or Extra Nutrients?

Microgreens usually don’t need added fertilizer if grown in quality soil. Hydroponic setups require mineral-enriched water. Too much fertilizer can burn tiny roots or change taste.

How Do You Prevent Mold on Microgreens While Growing?

Good air circulation helps prevent mold on microgreens indoors. Avoid overwatering and keep the soil just moist, not wet. Using a fan nearby can reduce humidity and spores.

Are Microgreens Safe to Eat Raw, or Do They Need Cooking?

Microgreens are safe to eat raw, which keeps their nutrients. Wash gently before eating to remove dust or seed coats. Cooking usually isn’t necessary and can reduce flavors.

How Long Do Microgreens Keep Fresh After Harvesting?

Microgreens stay fresh for about 5 to 7 days when refrigerated. Store them in a breathable container or paper towel-lined bag. Avoid moisture buildup, which speeds up spoilage.

Can You Grow Microgreens Outdoors, or Are They Best Inside?

You can grow microgreens outdoors, but indoor growing gives more control. Outdoors, pests and weather can cause issues. Indoors, you control light, temperature, and moisture easily.

Wrapping Up

Growing microgreens indoors is simple with the right steps and care. Start today by picking your favorite seeds and setting up a small tray. You’ll enjoy fresh, tasty greens in just two weeks.