How to Grow Radish Indoors
are one of the quickest and easiest veggies to grow indoors. In the garden, they also help keep the loose. In this blog, we’ll be talking about everything related to growing indoors, from basic facts, supplies, setup, and steps to grow, care for and harvest it.
Radish sprouts in 1-2 weeks. They can be harvested from Month 1-2 on.
need an equivalent of 6+ hours of direct sun [DLI of 18+ mol/m²/day].
Growing indoors is considered intermediate. You’ll sprout, thin, prune, and pollinate.
TABLE OF CONTENTS
Growing Indoors Using vs Hydroponics vs Microgreens
Radish plants do well in moist conditions. If the dries out completely the roots will die back and it will be tough for the plant to recover. On the other hand, if the roots are exposed to standing water for too long, they can rot.
Equipment Needed for Growing Indoors Using Soil
In growing indoors, we prefer using a Ceramic Self Watering Planter filled with a standard potting mix that self-regulates to keep the at consistent moisture for your plant to thrive (and no watering guesswork for you).
To set one up:
- Fill up the planter with dry from the bag, gently tamping down the top.
- Dump the into a large mixing bowl and add water until the is moist, but not sopping wet (about ½ Cup)
- Mix in 1 tablespoon of the Herb Blend Plant Food.
If you are using a regular pot instead, it should be a little bit bigger (at least 12"" / 5 gal and will need drainage holes to prevent it from being overwatered. Let the top of the dry out between watering.
Growing Indoors as Microgreens
can definitely be grown as microgreens, as a matter of fact, they are included in our own Growing Kit. Not only are they fast-growing with a satisfying crunch but they also have anti-inflammatory benefits, that can help detoxify and cleanse the body.
Click here to learn more about the different types of (such as with a spicy flavor), or grab a copy of our to learn more about all the different ways you can grow (and more!) at home.
Care and Maintenance of Indoors
Lighting for Growing Indoors
While you should take advantage of the sun (it’s free and perfect for plants) there are limited circumstances where indoor natural light is enough for plants to grow well. A very bright window can cut your grow light needs in half, but if you want to grow lots of Radish, you’ll still need one.
For an introduction to grow lights, head over to our post on grow lights for indoor gardeners. We’ve also got a buying guide for screw in types, but to keep things simple in this guide, we’ll just provide directions for the 24W Screw in Bulb by Sansi, which we think is a good middle-of-the-road option.
How bright should your grow light be?
Radish plants need the equivalent of 6+ hours of direct sunlight [DLI of 18+ mol/m²/day] to grow their best. In order to provide an equivalent amount with a grow light, it needs to be pretty bright! The 24W Sansi bulb should be placed 6 inches away from the top of the plant. This will give your PPFD (the standard measure of brightness) of 500 μmol/m²/s.
How many hours per day do your plants need under a grow light?
Radish plants are known as “long-day”. When they sense over 12 hours of light per day, they’ll start the end of their lifecycle and work on making seeds. We want to keep them in an earlier stage so we can keep harvesting the leaves, so we recommend setting up a timer to leave it on for only 10 hours per day.
Temperature Needed by Your Indoor Radish
Like it Cool
are known as “cool weather” vegetables, and will start to slow down (or totally stop) once temperatures rise over 70f they survive the hot weather period then they’ll start producing again once temperatures cool down.
Water and Humidity for Your Indoor Radish
thrive on consistent moisture but can suffer if they’re waterlogged, so make sure to water them regularly especially if you’re using soil. To avoid your being waterlogged, make sure to use a pot with drainage, or just use self-watering pots, as mentioned above.
Nutrients and Fertilizers
Radish like a rich and moist root zone - so you are best off with a standard potting mix - we like this Organic Mix by Espoma.
Best Nutrients for Radish: Herb Blend
Herb Blend. This should be high in nitrogen (with NPK numbers like 10-5-5). For Herb Blend, we recommend: Joyful Dirt All Purpose
Moving Your Plant Outdoors
Radish is a super fast-growing crop so in general, it is best to direct sow. If you are going to transplant, you will need to get the entire (long) taproot and try to disturb it as little as possible.
Timeline and Steps on How to
Best Setup forPlants
Below is the best setup (and a very easy one!) for growing your plants indoors. You’ll need:
Ceramic Self Watering Planter (preferred) or pot that is at least 12″ / 5 gal.
Standard Potting Mix
Herb Blend. This should be high in nitrogen (with NPK numbers like 10-5-5).
A strong grow light that can give the equivalent of 6+ hours of direct sun [DLI of 18+ mol/m²/day].
Starting your Radish: Seed vs Propagate
Radish plants are best to start from seed in the area they will grow to their full size (known as “direct sowing”). They’re not practical to propagate from cuttings & they don’t handle transplanting well. Fortunately starting from seed is simple and they sprout quickly!
How to Plant seeds
quickly from the seed. Plant 6 sites in a 12" / 5 gal container. In larger containers, space sites 2" apart. For each site press 1 seed into the surface. Keep the warm ( 55-85°F, ideally 70°F). Sprouts typically appear in 4 days but can be as quick as 4 days or as long as 10 days depending on your conditions.
Week 1-2: Check for Sprouts
You could see seedlings in as little as 4 days (though 4 days is more typical). If it’s been 10 days and you still don’t have any sprouts, it’s likely that your setup is too cold.
Week 2: Thin Your Seedlings
Thin your planter to only have 1 seedling per site - leaving the largest plant. If you are using the recommended planter (at least 12" / 5 gals) this will mean you’ve got 6 plants after thinning. By getting rid of the smaller seedlings, you’re allowing the biggest and strongest one to flourish by reducing its competition for water, food, and space.
If your seedlings are under 1 inch, stretching out, or folding over, it’s likely that they don't have quite enough light.
Month 1-2: How to Harvest Radish
are best to pick before they mature as they get taught and really spicy as they age. The right time to harvest them is when there's a widened dome on the top of the root (but no cracking).
How to Use Your Freshly-harvested in Cooking
Radish is a very delicious and healthy vegetable that can be often eaten/served as:
- Raw and sprinkled with salt/your favorite spices
- Toppings on quality bread
- Salads with your favorite dressing
How to Preserve Radish
There are several ways to preserve or keep your vegetables fresh, and here are just some of the easiest and the ones we recommend the most:
Month 3: End of Life
are meant to be eaten early - and once you pick them there's nothing left to grow, so you're best to start over.
If you’d like to learn about the dozens of other herbs, fruits, and vegetables that you can grow indoors then grab a copy of our free below.
Best Varieties to Grow Indoors
have a big range of spiciness and size. In general, the bigger ones (like daikon and horseradish) are slower growing and less of a natural fit for indoor gardening. We favor small and fast ones - with maturity times 35 days or less. Below are four of our favorite varieties to grow inside.
Early French breakfast
Toss in salads or add to tacos, omelets, or tea sandwiches. They can be used whole and roasted, braised, or pickled.Amazon
May be eaten raw in salads or sautéed in butter with salt, pepper, and herbs as a side dish. They may also be cooked like turnips, used in stir fry, or pickled.Amazon
Can be steamed or braised and served with hot sauce or vinegar, or can be included in soups and stews.Amazon
Can be made into salads, soups, stews, and stir-fries. Can also be blended raw or cooked with other vegetables Can also make an attractive addition to vegetable trays; serve with dressing or dip.Amazon
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