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How To Grow Broccoli Microgreens


Brassica oleracea var. italica


Broccoli (Brassica oleracea var. italica) microgreens are a delightful addition to any dish, with fresh, tender, and vibrant green leaves that boast a subtle yet distinct broccoli flavor. Their tender texture adds a crisp crunch to any salad or sandwich, while their bright green color makes them an attractive garnish. With their versatile flavor and texture, broccoli microgreens are a must-try for any food lover.

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Quick Facts:

  •  Common Name: Broccoli

  •  Scientific Name: Brassica oleracea var. italica

  •  Other Names: Calabrese, Sprouting Broccoli

  •  Family Name: Brassicaceae

  •  Flavor: Mild broccoli, Tart, Cabbage flavor

  •  Seed Rate: 20g-25g per 10″ x 20″ tray

  •  Seeds Per in2: 0.1g-0.125g

  •  Avg. Yeild/1020 Tray: 180-300g

  •  Pre-Soak: No

  •  Weight Duration: 2-3 Days

  •  Germination Time: 1-2 Days

  •  Blackout Time: 1-2 Days

  •  Harvest Time: 8-12 Days

  •  Growing Difficulty: Easy

Did You Know


pile of harvested mature broccoli

The United States ranks 3rd in the world for production of broccoli. India ranks 2nd and China is ranked 1st as the largest broccoli producer!

Plant Details &

Grow Guide

How To Grow Broccoli Microgreens

Want to add a touch of elegance and a burst of mild tart-cabbage flavor? Look no further than Broccoli microgreens! These tiny greens not only add flavor to your meals, but also provide a nutritional boost. In just 8-12 days, you can grow a lush garden of zesty greens that are both a treat for the eyes and a health-boosting delight.

Imagine enriching your dishes with these green beauties. They’re not only visually appealing but also packed with tons of health benefits. Are you ready to start cultivating your broccoli microgreens? Let’s go and get our hands dirty!

Step 1 Preparing Your Broccoli Seeds

First, you need to measure your seeds using a scale. The best seeding rate for a 10″ × 20″ tray is 20-25 grams. If you plan to grow them in a 10″ × 10″ tray then simply divide the total amount by two, in this case, 10-12.5 grams.

If you’re a rebel like me you can just eyeball it without weighing, just make sure that your seeds are approx ⅛-¼” (3-6mm) apart.

After measuring out your broccoli seeds, avoid washing and pre-soaking them. Wet seeds are difficult to spread evenly on your growing medium due to their small size.

Step 2 Sowing Your Seeds

To get started, prepare your growing tray by filling it with your preferred medium such as soil, potting mix, coco coir, or any other medium you prefer. But make sure to leave 1-2cm of empty space between the tray edge and the soil level.

This will help you during the harvesting process by minimizing the chances of accidentally digging into the medium with a knife.

After filling the tray, use your hands to level the medium so that it’s not clumpy. This is important because if the medium is uneven, the seeds may group together when you sow them, which can hinder their growth.

Start by lightly spraying your growing medium with a spray bottle until it becomes slightly damp, but not overly saturated.

Next, carefully distribute the seeds evenly across the surface of the medium. Take your time to ensure that they are spread out in a uniform manner. Finally, give the seeds a gentle misting with water so that they are all covered with a fine layer of moisture.

Step 3 Germination & Weight Period

Take an empty tray without any holes and put it on top of the seeds you have planted. I usually use a 15lb (6.80kg) paving block for trays that are 10″ x 20″ or a 7lb (3.17 kg) brick for trays that are 10″ x 10″.

This assists the seed’s radicle in penetrating the soil when it starts to grow. Without any weight, the radicles find it more challenging to dig into the growing medium and establish firm roots.

Keep in mind that the seeds will germinate while they’re covered and weighed down. A lot of people confuse the germination and weight period to be independent of one another and that you add them together, this is incorrect.

The germination time is there to give you an idea by what time the seeds will germinate, but you don’t add the germination time and blackout period together.

While your seeds are germinating and are weighed down you will need to keep your medium moist. You can do this by lightly misting your seeds every 12 hours, once in the morning and once at night.

Step 4 Blackout Time

After weighing down the seeds for about 2 to 3 days, they should have sprouted and now you can carefully lift the weighted tray. It’s time to remove the weight and begin the blackout phase.

Take your empty tray and flip it over to create a dome that blocks out light. Place it back over your seeds.

By keeping them in darkness for another 1 to 2 days, the newly sprouted seedlings will naturally stretch and reach out for light, helping them grow taller.

Now you can start watering your broccoli microgreens from the bottom. Simply add water to the drainage tray underneath. Personally, I recommend adding 1 cup of water twice a day. Once in the morning and once in the evening (every 12 hours).

Once the blackout period of 1 to 2 days is over, you can remove the top tray or blackout dome and expose your microgreens to light. I’ve found that providing them with 17 hours of light followed by a 7 hour break works well for me.

Continue growing your broccoli microgreens for additional 5 to 9 days, remembering to water them daily with approximately 2 cups of water per day. Once every 12 hours.

Step 5 Harvest

Harvesting your broccoli microgreens is straightforward that only requires a sharp tool. Personally, I absolutely love using the Green Mercer Produce Knife—I highly recommend it! But if you prefer scissors, there’s also a fantastic option available; these sturdy and dependable heavy duty scissors.

Now, here’s an important tip to keep your harvest pristine; make sure to keep your chosen tool (whether it’s a knife or scissors) away from the soil! It’s imperative in avoiding any accidental contact between the blade and the soil, you don’t want any unwanted dirt from sneaking into your microgreen harvest and contaminating it.

It is crucial to follow this advice if you want to guarantee that your harvested microgreens are of the highest quality and purity.

Plant Details & Taxonomy

Adding nutritional richness to your diet is easy and quick with broccoli (Brassica oleracea var. italica) microgreens. They have a mild cabbage flavor that adds a gourmet touch to salads, sandwiches, and other dishes.

In addition to their delicious flavor, they also enhance the visual appeal of your meals with their beautiful creamy white stems and green leaves, making the overall dining experience more enjoyable.

Growing them is a straightforward process, which makes it a great activity for both seasoned gardeners and beginners looking to add freshness and nutritional value to their meals.

SOURCE: The botanical data and taxonomic details were acquired from the USDA Plants Database

Rank Scientific Name
Kingdom Plantae – Plants
Subkingdom Tracheobionta – Vascular plants
Superdivision Spermatophyta – Seed plants
Division Magnoliophyta – Flowering plants
Class Magnoliopsida – Dicotyledons
Subclass Dilleniidae
Order Capparales
Family Brassicaceae – Mustard family
Genus Brassica L. – mustard
Species Brassica oleracea L. – cabbage
Subspecies Brassica oleracea L. var. italica Plencksprouting broccoli
Common Names Broccoli, Calabrese, Sprouting Broccoli

Microgreen Pests & Diseases

The following are the most common pests and diseases that can affect your microgreens.


White Mold – Sclerotinia sclerotiorum

Sclerotinia sclerotiorum is a necrotrophic fungal disease that causes what’s known as white mold, it can infect over 400 plant species worldwide. It’s also called cottony soft rot, stem rot, watery soft rot, crown rot, and seedling blight.

S. sclerotiorum key properties are its ability to create sclerotia which are its black resting structures, and mycelium which are the white fuzzy spiderweb-like growths you see on stems and growing medium.

microgreens suffering from damping off disease

Damping Off

Damping-off is an umbrella term that covers fungi and fungi-like organisms in several genera including Rhizoctonia, Botrytis, Phytophthora, and Fusarium, with the soil fungus Pythium being the often culprit.

Damping-off is a soil-borne fungal disease that affects seeds and seedlings typically by rotting of the stems and roots at and below the soil surface.

When a seed germinates the seedling will emerge fine but within 24 hours to a few days will become mushy and water-soaked, collapse at the base of the stem and die.

Aphids crawling on a plant stem

Aphids – Aphidoidea

Aphids suck! Quite literally. They’re soft-bodied insects that use their piercing-sucking mouths to feed on plants and there are over 4,000 aphid species in the world.

Other common names are greenflies, blackflies, and plant lice. They come in varying colors such as light green, black, white, brown, gray, or yellow.

When aphids feed on plants they secrete a sticky fluid which is called honeydew (no, don’t eat it). This goo they leave behind drips onto plants and can attract other pests such as ants. If the honeydew is left on leaves it can promote black sooty mold.

Broccoli Nutrition Facts

Broccoli microgreens are a highly nutritious vegetable that can greatly benefit your overall health and wellbeing. Despite its unassuming appearance, it provides a rich source of essential nutrients that can contribute to a balanced lifestyle. At only 141 calories per serving, broccoli is a low-calorie option that offers a range of benefits.

Broccoli is a great source of carbohydrates, with 6.64g per serving. It also contains 2.82g of protein, which is important for various bodily functions. With only 0.37g of total fat and no cholesterol, broccoli is a heart-healthy addition to your diet.

In terms of vitamins, broccoli is an excellent choice. One serving provides 99% of your recommended daily allowance (RDA) of Vitamin C, with 89.2mg. It also contains significant amounts of Vitamin A (41% RDA) and Vitamin K (85% RDA). Broccoli is also a good source of folate, with 63mcg per serving. Additionally, it contains a mix of B-vitamins, including Thiamin, Riboflavin, Niacin, and Pyridoxin, which are important for energy metabolism.

Broccoli is also a rich source of minerals, including calcium (47mg), iron (0.73mg), magnesium (21mg), and potassium (316mg), which are all important for overall health. It also contains a variety of phytonutrients, such as β-Carotene, α-Carotene, and Lutein + Zeaxanthin, which add to its nutritional benefits.

Incorporating broccoli microgreens into your diet can add flavor to your meals while providing a substantial nutrient boost. It’s an excellent choice for those seeking a nutrition-conscious lifestyle.

Nutrition value per 100 g. (Source: USDA National Nutrient Database). Recommended Dietary Allowance (RDA) calculation based on data from NIH Nutrient Recommendations and Database.

Disclaimer: Percent Daily Values are calculated based on a 2,000 calorie diet. Your daily values may be higher or lower depending on your calorie needs. The information provided here is for informational purposes only. I am not a medical professional. Always consult with a qualified healthcare provider regarding any health-related questions or concerns.

Principle Nutrient Value Unit RDA
Energy 141 Kcal 7%
Carbohydrates 6.64 g 5%
Protein 2.82 g 5%
Total Fat 0.37 g 1%
Cholesterol 0 mg 0%
Dietary Fiber 2.6 g 7%
Choline 18.7 mg 3%
Folate 63 mcg 16%
Selenium, Se 2.5 mcg 5%
Vitamin A 31 mcg 41%
Vitamin B1 (Thiamin) 0.071 mg 6%
Vitamin B2 (Riboflavin) 0.117 mg 9%
Vitamin B3 (Niacin) 0.639 mg 4%
Vitamin B-6 (Pyridoxin) 0.175 mg 13%
Vitamin C 89.2 mg 99%
Vitamin E 0.78 mg 5%
Vitamin K 102 mcg 85%
Sodium, Na 33 mg 2.20%
Potassium, K 316 mg 6.72%
Calcium, Ca 47 mg 4.70%
Copper, Cu 0.049 mg 5.44%
Iron, Fe 0.73 mg 9.13%
Magnesium, Mg 21 mg 5.12%
Manganese, Mn 0.21 mg 9.13%
Phosphorus, P 66 mg 9.43%
Potassium, K 316 mg 6.72%
Zinc, Zn 0.41 mg 3.73%
β-Carotene, beta 361 mcg 9.03%
α-Carotene, alpha 25 mcg 4.17%
Lutein + zeaxanthin 1400 mcg 23.33%

Recommended Seed Providers

I highly recommend True Leaf Market and SeedsNow for all your seed needs. Their wide selection of high-quality seeds and exceptional customer service make them the go-to choice for both novice and experienced gardeners alike.

True Leaf Market

For over 45 years True Leaf Market has been a provider of high-quality seeds both GMO and NON-GMO organic seeds. They also provide phytosanitary certificates if you need to import seeds to a country outside of the US.


SeedsNow is a family-run company, with the aim of assisting individuals, families, and communities in preparing for the future through the promotion of an organic and self-sustainable lifestyle. All their seeds are completely free from any genetic modifications, making them heirlooms, open-pollinated (OP), raw, natural, and untreated. Additionally, they do provide a selection of hybrid varieties on their website which will be clearly labeled as such in the product listings.

Marco photo of Broccoli Waltham seeds

Buy Broccoli Microgreen Seeds

Broccoli (Brassica oleracea var. italica) has tender, fresh, vibrant green leaves that boast a subtle yet distinct broccoli flavor. Perfect as a garnish or for adding texture to any salad or sandwich. Add a touch of freshness and a pop of color to your dishes by ordering Broccoli microgreen seeds today.

Recommended Products

Explore our top curated picks for products and places to buy from to grow microgreens. Rest assured that all the featured items and products have been meticulously put to the test by our team, or have received glowing recommendations from our esteemed readers.

Green Microgreens Growing Trays

Microgreen Grow Trays

For my personal home use, these microgreen trays are my go to. Measuring around 12.2 x 9.06 x 1.77 inches (31 x 23 x 4.5 cm), these trays are perfectly suited for cultivating microgreens in a home microgreen grow room. What’s more, they’re durable, and cleaning them is a walk in the park, making them an all-around convenient choice.

1020 Microgreen Trays - Shallow Extra Strength Colors

1020 Microgreen Trays – Shallow Extra Strength Colors

Industry leading BootStrap Farmers 1020 microgreen trays! Designed with long lasting durability in mind, these colorful trays are built to withstand years of use and abuse. With a height of 1¼ inches (3.2 cm), these shallow trays make harvests easy, saving you time and increasing your yield. The trays come equipped with 36 drainage holes that effectively remove excess water, promoting a healthy growing environment and preventing mold growth. If you’re serious about growing microgreens and want the best trays available on the market, these trays are it!

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These Other Microgreens

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