Broccoli microgreens are one of the easiest and fastest edible crops you can grow at home. In as little as 7–10 days, you can harvest fresh, tender greens from a small tray on your kitchen bench, windowsill or indoor growing shelf.
If you’re wondering how to grow broccoli microgreens, the good news is that you do not need a garden, expensive equipment or previous growing experience. With quality broccoli microgreen seeds, a shallow tray and regular watering, you can successfully grow broccoli microgreens indoors all year round.
This beginner-friendly guide explains exactly how to grow broccoli microgreens at home, including the best tray size, how much seed to use, which growing medium works best, how long to keep the tray in blackout, when to expose your microgreens to light, common problems to avoid and how to harvest and store them for maximum freshness.
Broccoli Microgreens at a Glance
What Are Broccoli Microgreens?
Broccoli microgreens are young broccoli plants harvested shortly after germination. They are usually cut when they are around 5–10 cm tall and have developed their first seed leaves.
They have a fresh, mild, slightly peppery flavour and can be added to sandwiches, salads, wraps, eggs, soups, smoothies and grain bowls.
Why Grow Broccoli Microgreens?
Broccoli microgreens are popular because they are fast, easy and suitable for small spaces. They are a practical choice for beginners, apartment growers and anyone who wants to grow fresh greens indoors without needing a garden.
- Ready to harvest in just 7–10 days
- Easy for beginners
- Suitable for indoor growing
- Great for kitchens, apartments and small spaces
- Useful in everyday meals
- Can be grown all year round
- A simple way to grow fresh greens at home
How to Grow Broccoli Microgreens in 7 Simple Steps
- Prepare a shallow growing tray.
- Sow broccoli microgreen seeds evenly.
- Cover the tray for 2–3 days during germination.
- Expose the seedlings to bright light.
- Water gently and grow for another 4–5 days.
- Harvest when the microgreens are bright green and 5–10 cm tall.
- Store and enjoy your fresh broccoli microgreens.
Under normal indoor conditions, broccoli microgreens are usually ready to harvest within 7–10 days from sowing.
What You Need to Grow Broccoli Microgreens at Home
- Broccoli microgreen seeds
- A shallow growing tray with drainage holes
- A second tray or lid for blackout
- Growing medium such as coco coir, hemp mat, silicone mat or quality organic potting mix
- Spray bottle or gentle watering bottle
- Clean water
- A bright windowsill or grow light
- Clean scissors for harvesting
How Much Broccoli Microgreen Seed for a 10 x 10 Inch Tray?
For a standard 10 x 10 inch microgreen tray, use approximately 1 tablespoon of broccoli microgreen seeds. This is around 15 ml of seed.
This sowing rate gives good coverage without overcrowding. The seeds should sit close together across the surface of the tray, but they should not be piled heavily on top of one another.
Best Growing Medium for Broccoli Microgreens
Broccoli microgreens can be grown in several different growing mediums. The best choice depends on your setup, budget and preferred growing method.
Coco Coir
Coco coir is a popular choice for home growers. It holds moisture well, is easy to use and provides good support for the roots.
Organic Potting Mix
A fine, quality organic potting mix can also work well. Avoid heavy, chunky mixes, as they can make it harder to sow evenly and harvest cleanly.
Hemp Mats
Hemp mats are convenient and tidy. They are useful if you want a cleaner harvest with less loose growing medium.
Silicone Mats
Silicone microgreen mats are reusable and suitable for hydroponic growing. They can be a good option for growers who want to reduce waste and avoid soil-based media.
Best Temperature for Growing Broccoli Microgreens
Broccoli microgreens generally grow best in mild indoor conditions, ideally around 18–24°C. Warmer conditions can cause trays to dry out more quickly and may increase the risk of mould, especially if airflow is poor. Cooler conditions can slow germination and extend the growing time.
Step 1: Prepare Your Tray
Start with a clean shallow tray. If using coco coir or potting mix, add approximately 2–3 cm of moist growing medium to the tray.
Level the surface gently with your hand. The medium should be evenly moist, like a wrung-out sponge, but not soggy.
If using a hemp mat or silicone mat, place it flat inside the tray and moisten it thoroughly before sowing.
Step 2: Sow the Broccoli Microgreen Seeds
Sprinkle the broccoli seeds evenly over the surface of the growing medium or mat.
Try to spread the seeds in a single even layer. Dense sowing is normal for microgreens, but overcrowding can reduce airflow and increase the risk of mould.
Broccoli microgreen seeds do not need to be soaked before sowing.
After sowing, lightly mist the seeds with clean water.
Step 3: Blackout Period for Germination
Cover the tray with a second tray, lid or blackout cover. This creates a dark, humid environment that helps the seeds germinate evenly.
Keep the tray covered for approximately 2–3 days.
Check once or twice daily. If the seeds or growing medium look dry, mist lightly with water. Avoid overwatering, as too much moisture can cause mould or poor germination.
Step 4: Expose the Microgreens to Light
Once most of the seeds have germinated and the shoots are pushing upward, remove the blackout cover.
Place the tray in soft, bright light. This can be a bright windowsill, a sheltered indoor position or under LED grow lights.
The shoots may look pale yellow at first. After exposure to light, they will usually turn green within 24–48 hours.
Step 5: Water and Grow for 4–5 Days
Allow the broccoli microgreens to grow in light for another 4–5 days.
Keep the growing medium evenly moist. Water gently once or twice daily depending on temperature, airflow and how quickly the tray dries out.
For best results:
- Keep the medium moist but not waterlogged
- Provide good airflow around the tray
- Rotate the tray if light is coming from one side
- Avoid harsh direct sunlight that may dry the tray too quickly
Step 6: When to Harvest Broccoli Microgreens
Broccoli microgreens are usually ready to harvest within 7–10 days after sowing. The exact timing depends on temperature, light levels and growing conditions.
For the best flavour and appearance, harvest broccoli microgreens when they are approximately 5–10 cm tall, bright green and have fully opened their seed leaves. Most growers harvest before the first true leaves begin to develop.
Step 7: How to Harvest Broccoli Microgreens
Use clean scissors to cut the microgreens just above the growing medium.
Harvest only what you need, or cut the whole tray at once. Avoid pulling the plants out by the roots, as this can bring growing medium into your harvest.
For the best flavour and texture, harvest just before eating.
How Much Can You Harvest from One Tray?
A standard 10 x 10 inch tray can usually produce a generous handful of fresh broccoli microgreens. The exact yield depends on seed density, growing medium, light, temperature and harvest timing.
For home growers, it is usually better to focus on growing clean, healthy microgreens rather than sowing too densely to maximise yield. Overcrowded trays are more likely to develop airflow and mould problems.
How to Store Broccoli Microgreens
If you have extra microgreens, store them in an airtight container in the fridge.
For best storage:
- Harvest with clean scissors
- Keep the microgreens as dry as possible before storage
- Line the container with paper towel
- Use within a few days for best freshness
How to Use Broccoli Microgreens
Broccoli microgreens are easy to add to everyday meals. Their mild, fresh flavour works well with many foods.
Try them:
- On avocado toast
- In sandwiches and wraps
- Scattered over scrambled eggs or omelettes
- Mixed through salads
- Added to smoothies
- Used as a fresh topping for soups
- Sprinkled over grain bowls or roasted vegetables
Broccoli Sprouts vs Broccoli Microgreens
Broccoli sprouts and broccoli microgreens both come from broccoli seed, but they are grown and harvested differently.
Tips for Growing Broccoli Microgreens Indoors
Broccoli microgreens are particularly well suited to indoor growing because they require very little space and grow quickly in a stable environment.
- Use a bright windowsill or LED grow light
- Maintain good airflow around the tray
- Avoid overwatering the growing medium
- Start a new tray every few days for continuous harvests
- Keep trays away from direct heating or air-conditioning vents
With a simple setup, it is possible to enjoy fresh broccoli microgreens indoors throughout the year.
Common Problems When Growing Broccoli Microgreens
Mould on Microgreens
Mould is usually caused by too much moisture, poor airflow or overcrowding. Improve airflow, reduce watering slightly and avoid sowing the seeds too thickly.
Yellow Microgreens
Yellow shoots are normal during blackout. Once exposed to light, they should turn green within a day or two.
Leggy Growth
Long, weak stems usually mean the microgreens need more light. Move the tray to a brighter position or use a grow light.
Dry or Wilting Microgreens
If the tray dries out, the seedlings may wilt quickly. Keep the growing medium evenly moist, especially in warm weather.
Frequently Asked Questions
Do broccoli microgreen seeds need to be soaked?
No. Broccoli microgreen seeds are small and generally do not need soaking before sowing.
How long do broccoli microgreens take to grow?
Broccoli microgreens usually take 7–10 days from sowing to harvest.
Can broccoli microgreens be grown indoors?
Yes. Broccoli microgreens are ideal for indoor growing and can be grown on a windowsill, kitchen bench or under grow lights.
How much seed should I use for a 10 x 10 inch tray?
Use approximately 1 tablespoon, or 15 ml, of broccoli microgreen seeds for a 10 x 10 inch tray.
Do broccoli microgreens regrow after cutting?
Broccoli microgreens are generally grown as a single-cut crop. For a continuous supply, start a new tray every few days.
Can you grow broccoli microgreens without soil?
Yes. Broccoli microgreens can be grown successfully on hemp mats, silicone mats and other hydroponic growing surfaces.
Are broccoli microgreens easy to grow?
Yes. Broccoli microgreens are considered one of the easiest microgreens for beginners because they germinate quickly and require very little equipment.
How often should I water broccoli microgreens?
Most trays need watering once or twice daily. The growing medium should remain evenly moist but never waterlogged.
Can I grow broccoli microgreens all year round?
Yes. Because they are typically grown indoors, broccoli microgreens can be grown year-round in most homes.
Are broccoli microgreens the same as broccoli sprouts?
No. Broccoli sprouts are grown in water and harvested earlier, usually within 3–5 days. Broccoli microgreens are grown in a tray, exposed to light and harvested once the young seedlings have developed their seed leaves.
Learning how to grow broccoli microgreens is simple, quick and rewarding. With one tablespoon of seed, a shallow tray and a few minutes of care each day, you can harvest fresh greens at home in little more than a week.
Once you have grown your first tray, you can start a regular routine and enjoy fresh broccoli microgreens in your meals all year round.