How to Grow Microgreens Indoors During Winter (Beginner’s Guide)

microgreens growing indoors on a windowsill during winter

During the cold months, when your outdoor garden rests under a blanket of snow, growing microgreens indoors is a fantastic way to stay connected with nature. These tiny, nutrient-packed plants are quick to grow, need little space, and can bring fresh greens to your kitchen all winter long.

Let’s walk through how to grow microgreens indoors step-by-step — perfect for beginners and small spaces.

Step 1: Choose the Right Microgreens

Some varieties grow faster and do better indoors during winter.

Best options:

Radish
Broccoli
Arugula
Kale
Pea shoots
Mustard greens

These germinate quickly, usually within 5–7 days, and don’t require strong sunlight.

Step 2: Prepare Your Containers and Soil

Use shallow trays or recycled food containers with drainage holes.
Fill them with a light potting mix — ideally one meant for seed starting.
You can also use coconut coir or peat moss for a cleaner, soil-free setup.

Keep the soil moist but not soggy. Before sowing, mist the surface lightly with a spray bottle.

Check out Grow Microgreens Indoors – Maryland Grows

Step 3: Sow the Seeds Evenly

Sprinkle your seeds evenly over the soil — about 1 teaspoon per tray (depending on size).
Press them gently into the surface but don’t bury them deep.
Then cover the tray with a lid or another tray to keep it dark during germination (2–3 days).

Step 4: Provide Light and Warmth

Once you see sprouts, remove the lid and move your tray to a bright windowsill.
During Canadian winters, daylight is short, so consider using LED grow lights to supplement.
Place the lights about 6–8 inches above your trays and keep them on for 12–14 hours daily.
Ideal temperature: 18–22°C (65–72°F).

Step 5: Water Carefully

Microgreens prefer moisture but can easily rot if overwatered.
Use a spray bottle to mist twice a day — morning and evening works best.
Avoid pouring water directly onto the soil, as it can displace the tiny roots.

Step 6: Harvest and Enjoy!

Most microgreens are ready to harvest in 10–14 days.
Use scissors to cut just above the soil line when they’re 2–3 inches tall.
Give them a quick rinse and enjoy in salads, sandwiches, or smoothies.
They’re not only delicious but packed with vitamins A, C, and K — a fresh boost in winter!

See Also: Start a Small Herb Garden at Home

Extra Tips:

Rotate trays every few days so all sides get equal light.

Avoid overcrowding seeds — it helps prevent mold.

Try different seed mixes to keep your harvests interesting.