I like growing radishes in containers as it is a fast-growing and easy-to-care-for root vegetable ideally suited to be grown in staggered phases for a regular harvest.
Radishes are cool-temperature vegetables and prefer a temperature around 10-18 degrees Celsius (50-65 Fahrenheit).
I start radishes in containers from February through October.
Tip: Try growing radishes and other fast growing vegetables and herbs like lettuce, spinach, dill, and arugula (rocket) to have easy access to greens for your household. Plant the seeds in rows next to slower growing vegetables like carrots and parsnips to make good use of your available growing space.
If you plan to plant several batches of radishes in the same spot, you must add compost or liquid fertilizer between batches.
- Growing radishes – a proven method
- Do I need a vegetable garden to harvest homegrown radishes?
- The importance of potting soil
- Grow radishes in containers from seeds
- How to use radishes
- Frequently asked questions
Growing radishes – a proven method
Plant 20-50 seeds every two weeks starting in February to continually harvest radishes from March through November.
My recommendation is to mix it up with other fast-growing vegetables and herbs. You could, for example, plant one row of radishes and complement them with greens like
Ideally, plant radishes during the shoulder seasons to avoid the year’s hottest months. Even when growing radishes in containers, you will find it difficult to get radishes to grow well in warmer temperatures.
Radishes grown during the hotter periods tend to use energy for foliage growth and then bolt and set flowers early. This is not ideal, as we want the plant to use its energy for root growth over green leaves and foliage.
Did you now that radishes belong to the Brassicaceae (mustard or cabbage) family and are related to kale, broccoli, horseradish  and other cole crops.
Growing radishes in hot temperatures
You can grow radishes in containers in summer, even though radishes are a cool-season crop.
One of the main benefits of container gardening radishes is that we can be more flexible.
To grow radishes during the hotter months, try shielding the plant from direct sunlight using 30% – 50% shade covers. But even with covers, the hot weather can cause the plant to mature faster and bolt.
Shade covers often use a percentage to indicate how much light the shade cover will block. We use 30% to 50% for our vegetables when environmental factors and conditions call for it.
The solution is to plan where to locate your container gardens. I plant radishes in containers during the hotter months and place the containers in a few spots in our garden where there is more shade.
Follow these simple rules, and you, too, will have an urban container garden bringing fresh vegetables to your table for every meal.
Do I need a vegetable garden to harvest homegrown radishes?
But choose your container or pot wisely. Radishes do not spread out but still need space to grow and develop strong root systems. And if you crowd root vegetables, you will have a smaller crop. Give your radishes space to grow, and you will harvest plump and nice-looking radish roots.
Be patient. Radishes can take time to form roots large enough to harvest. The expected harvest time on the seed packet is just an estimate. I have on more than one occasion had to wait 1-2 weeks longer to harvest my radishes.
Also, if you use garden soil bags to grow radishes, make sure you choose a small root crop variety. Avoid the longer and cylinder-type varieties like the daikon or winter radishes.
But generally speaking, space is not a problem. There are plenty of other different radish varieties to choose from. You will surely find a radish variety giving you the color, shape, taste, and form you want.
The importance of potting soil
It is always essential to use quality potting soil when growing herbs and vegetables.
You can buy a good quality potting mix soil or mix your own potting soil.
Radishes grow well in compost-rich, sandy, fertile potting soil that drains well. You also want soil free from stones and other hard, large objects that may interfere with root growth.
Well-draining soil is essential as radishes will suffer root rot if grown in constantly wet soil.
Check your seed packet, but most varieties of radishes prefer a slightly acidic to neutral potting soil (6,5-7,0 pH).
Grow radishes in containers from seeds
The radish plant grows from a tiny seed. Start your radish seeds directly in the pot or container where they will grow. Starting or planting radishes in starter pots indoors has no advantage or benefit.
Radishes prefer half shade but tolerate full sun if the soil is moist and you can control the temperature. Radishes are prone to bolt in hot weather.
Make sure you use well-draining, fertile, compost-rich, and sandy soil. The soil needs to be kept moist, and using mulch, like grass clippings, can be helpful.
1. Planting radish seeds (5 steps)
1. Draw a 1 cm (⅓ inch) deep line in the soil using a stick, dibble, or finger.
2. Water thoroughly.
3. Place radish seeds in the soil, leaving about 3 centimeters (1 inch) between the seeds. If planting several rows of radishes, allow for 15 centimeters (6 inches) of space between the rows.
3. Cover radish seeds with soil when planted.
4. Water the planted radish seeds gently using a watering can with a rose (like a shower head). If you water too hard, you may remove the soil and expose the seeds.
5. Cover the area with a protective mesh or shade cover to repel harmful insects, pests, and bugs.
2. Waiting for radish seeds to germinate and sprout
Now we wait. Radish seeds germinate in 1-2 weeks. But often, seeds will germinate in as little as 4-5 days, and you can soon see the first leaves sprout.
Most of the varieties of radish seeds you buy for your garden will produce mature plants in 20-30 days.
Some varieties may take as long as 70 days to mature and be ready for harvest. Read the seed packet before you buy seeds.
3. Caring for your radish plants
You sow seeds and wait for the first leaves to sprout. Then, all of a sudden, you realize that you have too many young seedlings. Do not worry. This is a happy problem.
Radish greens are a delicacy – especially the young and green leaves.
Use sharp garden scissors to thin out the weaker plants, and wash the radish leaves before adding them to your next table salad.
Radish plants do not like to dry out and need plenty of water to develop that fresh, peppery flavor and crispy texture we all look for.
We look for half shade when we grow radishes in containers. Growing radishes in full sun and hot temperatures calls for automatic drip irrigation to stay on top of watering .
It is essential to keep the soil moist when you grow radishes in containers. Mulching the container soil with, for example, grass clippings, straw, or hay is a great way to protect the plants from soil-borne pathogens while helping to keep the soil moist for longer.
After about two weeks, you can add more organic materials like compost or aged manure, but be careful not to add too much nitrogen by mistake. Nitrogen promotes leafy growth, and you have to remember that you want the growth to happen below the ground.
Before adding any vegetable fertilizer, you need to look at what is already given to the plants. Everything from grass clippings to slow-release fertilizers adds up, and you do not want to overfertilize your seedlings and plants.
4. Radish pests and diseases
Growing radishes in containers, you are not immune to pests and diseases. Some common pests and diseases include flea beetles , aphids, downy mildew, cutworms, Alternaria blight, and white rust .
Early detection is always crucial with any pest and disease. We use a Neem oil and water spray mixture to treat affected plants.
You should also try to keep a regular watering schedule and avoid dryouts resulting in plant stress. Good airflow between plants and avoiding getting leaves wet are other measures that will help protect your plants.
You also have the option to choose disease-resistant radish varieties. Check with your local garden center, but there are varieties that, for example, are resistant to downy mildew and black rot .
5. Harvesting radishes
Most varieties of radishes are ready to be harvested when the base of the root is approximately 2-3 centimeters (about 1 inch) wide.
At this stage, you will be able to see the base of the radish root above the surface of the soil.
Always harvest one or two radishes first and taste. The taste will be fresh with a hint of pepper, and the texture should be crisp when your radishes are ready for harvest.
Do not leave your radishes in the ground for too long. The texture will turn wooden, losing much of the flavor.
I prefer harvesting radishes early to ensure crisp taste and texture.
How to use radishes
Radishes can, of course, be used any way you choose. I have three favorite ways to use radishes.
1. Eaten fresh just as they are
- Harvest your radishes and put them in ice-cold water for a couple of hours.
- Next, wash them and cut off the green leaves.
- Mix a fresh dip using Sour Cream/Creme Fraiche, salt, and pepper.
- Add lemon juice or another citrus fruit to add a tangy freshness to taste.
And there you have it—a perfect way to enjoy fresh, crisp radishes.
I find that spring varieties are best to eat fresh, whereas winter radishes sometimes need some help.
2. Use radishes in salads
Slice radishes and add them to your salads for an instant flavor kick. And why not mix red, yellow, and white radishes for beautiful color contrasts?
Or why not create a creamy salad using Sour Cream/Creme Fraiche, salt and pepper, mayonnaise, and thinly sliced och cubed radishes?
Wonderful to smear on fresh or lightly toasted bread.
3. Add radishes to your raw vegetable salads
Use a mandolin slicer (carefully) to add thinly cut radish slices to your raw vegetable salad. Use tall, slim, oval, as well as round radishes if possible.
Finally, add cilantro leaves for that fresh zing.
An instant favorite to enjoy with fresh bread or as a wrap.
Frequently asked questions