Growing Radish Microgreens

Radish microgreens are very popular with foodies and home microgreen growers.

There are many good reasons for the radish microgreen popularity. For foodies and chefs, radish microgreens add fresh flavor, crunchy texture, and spiciness to food. Radish microgreens are also packed with vitamins and vital nutrients.

For the home grower, radish microgreens are easy and quick to grow when you follow a few basic steps. 

This article will outline those steps as well as discuss the nutritional value of radish microgreens. 

radish microgreens showing stems

Growing Radish Microgreens

Before we get into the nutritional value of radish microgreens, let me outline the few basic steps you'll need to grow them.

If you're more interested in the nutritional information, click this link to skip down to that section.

Also, if you're looking for a radish microgreen kit or radish seed click the highlighted links to visit the Home Microgreen Store.

How to Grow Radish Microgreens

Radish microgreens are one of the easiest and quickest microgreens to grow. As such, they are an awesome variety for first time growers to sow, raise, and harvest.

The seeds are easy to handle, they germinate quickly, grow like weeds, are easy to harvest, and provide ton of flavor and crunchy texture to food. 

Within 10-days of planting the seed you can be eating radish microgreens. Beginning growers will get to see the whole process in about a week, and that keeps continued interest to grow microgreens high.

Ten Easy Steps

Below is a list of the ten steps to growing radish microgreens. For a more detailed explanation, and to see a video of each step, take a look at Growing Microgreens for the First Time.

Here are the steps to grow radish microgreens using the Home Microgreen Kit. If you don't have the kit, the photos will show you what you need in order to grow microgreens. You can click images to expand their size.

Note: Some of the images below are of the beta Home Microgreens Trays (opaque trays & red lids). The black trays and opaque lids are the new Home Microgreens Trays. Both are similar-sized, but the later use much less soil and are therefore more economical.

Step 1

Add a premium potting mix to the planting tray. A planting tray needs small holes in the bottom so water can be drawn up from below instead of top watering once the greens have germinated. The soil should be firmly compacted and level just below the top of the tray. Read this article on why I believe soil is better

how to grow radish microgreens

Step 2

Use a spray bottle to wet the soil surface with un-chlorinated water. Allow the water to soak in to the soil, then spray the surface again. If you see depressions or high spots on the soil, use your fingers to level the surface.

growing radish microgreens spraying the soil

Step 3

Add your radish seed to a shaker bottle. A shaker bottle will allow you to spread the seeds more evenly. There are between 2,500 to 2,600 radish seeds in an ounce. That's around 90 seeds per gram.

For radishes, you want about 10 seeds per square inch. So if your planting tray surface is 37.5 square-inches you'd add 4.5-grams of radish seeds to your shaker bottle.

Below is a photo of 4.5-grams radish microgreen seeds, or about 1.5 teaspoons.

Note* The amount of seed varies for the perfect seed density. Even among the same type of microgreens.

For instance, the radishes shown are Red Champion Radishes which need 4.5-grams, but Purple Rambo Radishes need over 5-grams of seed for the same seeding area.

growing radish microgreens seeds

If you're using your own planting tray with a different dimensions than the Home Microgreen Tray use the calculator in this article to figure out how much seed to use.

Step 4

Now that the soil surface is prepared and the radish seeds are in the shaker bottle it is time to sow them.

Start sprinkling seeds onto the soil working in concentric circles around the planting tray. It can be helpful to hold your spare hand around the tray so seeds don't bounce out of the tray.

Spread the seeds as evenly as possible across the surface. You may need to unscrew the top off the sprinkler bottle to get the last few seeds out of the bottle. Once all the seeds are out of the bottle use your finger to spread out clumps of seeds to areas with less seeds.

Don't worry if the seeds aren't perfectly spaced. The seeds will grow and the plants will spread out to fill the voids.

how to grow radish microgreens

Step 5

Now it's time to prepare the radish seeds to germinate. Use the spray bottle again and wet the seeds. Go easy so the seeds don't fly off the tray. The water will also help settle the seeds into the soil.

Place the planting tray inside the watering tray. A watering tray is one that doesn't have holes and will hold water. Use a similar size tray, like in the Home Microgreen Kit, or you can use a larger tray.

Place a cover on the seeds (don't seal the tray tight), if the cover is transparent or opaque, use a tea towel or cut a piece of cardboard to fit the cover to keep light off the seeds.

Most microgreens can be left on the soil surface, but they need to be covered to keep light off them while they germinate (we tested this, read why it's important to blackout and weigh down seed by clicking this link). Radish microgreen seeds are no exception.

Place a weight on top, this not only keeps the cover on but also encourages the plants to root into the soil media. Below we've used a fossil, now we use 5-pound weights! Don't worry, the growing plants are vigorous and will lift the cover as well as the weight as they grow.

home-microgreen-tray-covered

Step 6

Don't do anything for 2- to 3-days. Just let the seeds germinate and grow. The cover will retain enough moisture for the seeds to grow.

Step 7

On day 2 you can look at the seeds, but it's better to wait until day 3 to remove the cover. You'll see that germination has taken place and the radish seedlings are growing!

At this point you have a decision to make. If the germination rate looks good and the seedlings are similar to the ones in the image below you can remove the lid and allow the young plants to receive light.

If they're smaller, or there isn't a lot of germination, check the soil surface to see if it is dry. If so, use the spray bottle and wet the surface again and place the cover back over the tray. Let the seeds germinate for another day or two before checking on them again.

growing radish microgreens on day 2

Step 8

Now that the radish microgreens have germinated and started to root and grow it's time to get them in some light. There's a lot of discussion about what light is best for microgreens. I think it's best to give them as much light as possible.

After all, light is where the plants get their energy to grow. Whether it be sunlight, cheap LED lighting, or a special grow light, give them as much as you can. Don't fret over it, just do the best you can with what you have.

If the plants look white or yellowish, don't worry, once they receive light they will turn dark green. If the soil surface looks dry, use the spray bottle to wet the surface. But this will be the last time you use the spray bottle.

Step 9

Let the radish microgreens grow and give them water from the bottom. Here's where the watering tray comes into play. Memorize how the weight of the dry tray feels. Judging the weight this way is how you'll know when to water again.

Add water to the watering tray, a quarter of an inch works at first. Set the planting tray in the water and allow it to absorb the water from below.

Watering from the bottom keeps the leaves and stems dry, eliminating the possibility of damping-off disease and stopping soil from splashing up on the plants.

The first time you water you may have to add more water because the majority of the soil in the tray is dry. Afterward, you won't need to add as much water.

Every other day check the weight of the tray to see if it needs water. The need will depend on the humidity and amount of air moving across the tray.

growing radish microgreens watering

Step 10

Time to harvest! After 8- to 10 days the radish microgreens will be ready to harvest. Once they are 2 1/2- to 3-inches tall you can harvest them.

Harvest radishes during the cotyledon stage, before the first true leaves form.

To harvest, tip the tray about 45-degrees over a cutting board or a large plate and using stainless steel scissors, or a very sharp knife, cut the radish microgreens just above the soil surface.

Try not to disturb the soil. If some soil does spill, it's okay, use your hands to fluff the cut microgreens the soil particles will fall to the board or plate where you can wipe it off.

It's always recommended to wash microgreens before you use them (I don't if they are dry and clean) to be sure no bacteria is on the microgreens. 

Cut only what you're going to use that day. Replace the growing tray under the light and let them grow so more.

If you can't use all of your radish microgreens before they grow too tall and leggy, cut them and place them in a zip-lock bag with several small slits cut in the bag. Don't wash the microgreens at this point.

You want them dry, as they will stay fresher longer. Squeeze the air out of the bag and store the microgreens in the refrigerator crisper.

growing radish microgreens ready to harvest

Simple Right?

That's all there is to growing radish microgreens. If you have any questions feel free to use the comment section below the article to ask. I'll get right back to you.

Radish Microgreen Products

Radish microgreens

Champion Red Radish

Most common radish microgreen grown.

  • Grows Quick - Harvest in 7-days 
  • Mild earthy taste 
  • Green leaves with pink stems
radish microgreens

Purple Rambo Radish

Adds beautiful color to your salads or garnishes.

  • Grows Quick - Harvest in 7-days 
  • Beautiful purple leaves with a few green ones 
  • Spicy flavor compared to Champion Red
Radish microgreen kit

Champion Radish Kit

All you need to start growing microgreens

  • Professional soil mix - shaker bottle - spray bottle 
  • Perfect amount of seeds for the trays 
  • A planting and watering tray work great together

Radish Microgreen Nutrition & Flavor

Radish microgreens have high levels of Vitamin B3 (Niacin), Vitamin B6, Vitamin C, Folate, and the mineral Manganese.

They also contain Vitamin A, E, and K as well as potassium, iron, phosphorus, pantothenic acid, calcium, magnesium, zinc, and beta carotenes.

You can download a chart presenting the vitamins and minerals for the most commonly grown microgreens by clicking the button below.

For more in-depth nutritional information about radish microgreen and sprouts you can see a chart published by Heal with Food.

Radish Microgreen Flavor and How to Use Them

Radish microgreens add a fresh, crunchy, and spicy flavor to your foods.

They have a pleasant peppery flavor similar to that of root radishes, but not as quite strong. To me, they have an earthy flavor. 

Radish microgreens are great in salads and cold soups. Put radish microgreens on a burger and enjoy a more flavorful, crunchy, topping than regular lettuce.

Their small size also makes them a great raw garnish to dishes that can benefit from a peppery element.

Interested in Growing Radish Microgreens?

If you'd like to try growing your own radish microgreens at home use the buttons below to take a look at a radish microgreen kit or if you have the supplies radish microgreen seeds.

Have a Question?

If you have any questions about the information in this post or microgreens in general please leave a comment below or reach out to me using the Ask a Question page

Leaving a comment or using the Ask a Question page does not add your email to any mailing or marketing list. 

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