Crisp, juicy, and bursting with a fresh, peppery taste, radishes (Raphanus sativus) are cool season vegetables that are fast and easy to grow.
And thanks to their compact size and easy care habits, these root crops are a breeze to grow in pots, planters, and even window boxes – no garden beds needed!
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Ready to harvest in just four to eight weeks after sowing, radishes are one of the earliest crops to reap and can be sown in late summer for an autumn harvest – the perfect plant to start and wrap up the growing season.
So are you ready for a few pots of these fiery (or mild) root veggies? Then let’s dig into the easy steps of how to grow radishes in containers.
Here’s a look at what’s ahead:
What You’ll Learn
Radishes, Raphanus sativus, are grown for their round, tapered, or cylindrical taproots in pretty shades of gold, mauve, pink, purple, red, and white with white flesh.
Cool season annuals, they do best in spring and fall temperatures.
Fast growing, the roots are typically harvested when they’re an inch or two in diameter, or about 30 days from planting, although some are ready in as little as 22 days.
All parts of the plant are edible, including the flavorful, mild-to-spicy greens, flowers, and seedpods!
And growing them in containers is just as rewarding as in garden plots – so let’s dig into the details now.
Choosing a Container
Any pot or planter can be used as long as it’s at least six inches deep for globe varieties and 10 inches deep for oblong ones.
And they must have drainage holes – radishes love lightly moist soil but wet conditions can cause root rot.
If desired, you can line the bottom with a layer of drainage material such as broken pottery or pebbles to keep the soil draining freely.
Large planters can be used as well.
Because these tasty orbs finish early in the growing season, planters can be easily repurposed for hot season crops like cucumbers, tomatoes, and peppers, or annuals, herbs, and so on.
Radishes need cool, loose, water-retentive, and well-draining soil that’s rich in organic matter and with a slightly acidic to neutral pH of 6.0 to 7.0.
You can purchase a commercial potting mix or make your own.
Here’s a recipe that I use for almost all my container-grown crops:
- One part garden or potting soil for tilth and texture.
- One part water-retentive materials such as coir, peat moss, or vermiculite.
- Two parts of compost, well-rotted manure, or worm castings for nutrients and a loose, porous texture.
Before sowing, remove any debris such as sticks and pebbles to prevent deformed roots.
Cultivars to Select
There are numerous delicious and colorful radish cultivars to select. Here are a few of my favorites for growing in pots:
Cherry Belle
‘Cherry Belle’ is an heirloom that produces bright red, rounded globes of about an inch in diameter, perfect for cultivating in containers.
They are ready to harvest just 22 days from sowing.
You can find ‘Cherry Belle’ seeds available at Burpee.
Crimson Giant
Perfect for larger pots and planters, ‘Crimson Giant’ produces two-inch flattened pink globes.
Expect to harvest in 28 to 30 days from sowing.
Pick up seeds in a variety of packet sizes from Eden Brothers.
Early Scarlet Globe
Crispy and mild-flavored, ‘Early Scarlet Globe’ is round and bright red.
Ready to harvest in 20 to 28 days, this is the perfect radish to grow in a pot.
Find seeds in packets of 300 available at Burpee.
To whet your appetite, have a look at our guide to 25 of the best radish varieties to grow for several worthy spring and winter types!
How to Sow
Spring and winter varieties are best started from seed. You can purchase transplants from your local nursery, but they are so quick to grow from seed it is hardly necessary!
Here’s how to start from seed:
- After preparing the soil, mix in one or two tablespoons of bone meal and a balanced fertilizer such as 4-4-4 (NPK).
- Sow seeds or set pre-measured seed tape into the soil, planting them half an inch deep and one inch apart.
- Sow in short drills or spirals for circular pots, about six inches apart, or scatter seed lightly over the surface and cover with half an inch of soil.
- Firm the soil lightly with your fingertips.
- Water gently and keep the soil lightly moist until seeds germinate, in approximately three to 10 days.
After germination, wait until the seedlings have true leaves, then thin to two or more inches apart, depending on the expected mature size of the bulbs.
Container Care
All types of radishes do well in containers, if you’re growing winter types you’ll need a large pot deep enough to accommodate the hefty taproots.
Seeds for spring varieties are sown from late winter to mid-spring.
To extend the harvest, make successive sowings every seven to 10 days over three or four weeks.
For fall harvests, plant successively throughout September for harvesting in October and early November, if your first-frost dates permit. Plant daikon or winter varieties at this time as well.
For the best quality bulbs and fast growth, R. sativus requires a cool climate and moist environment.
Set pots in a full sun or light shade location. Full sun is best but if the afternoon sun becomes too hot, they’ll struggle and may bolt.
Move potted plants to a spot with afternoon shade or provide relief with small hoops and floating row cover fabric.
For the fastest growth and crisp, juicy roots, the Goldilocks temperature range are overnight temps of 40 to 50°F with a daytime range of 50 to 65°F.
Radishes need consistently moist soil for the best quality bulbs. In the absence of rain, water when the top half inch of soil dries out.
If you applied fertilizer at planting time, there’s no need to feed again but you can add a balanced, liquid plant food halfway through the growing season if you wish.
Pests and Disease
Disease is rarely a problem with these crops as their growing season is so short.
However, pests such as root maggots and flea beetles can cause issues with container-grown plants.
You can read up about how to deal with problem pests in our guide to growing radishes.
An Early Season Favorite
Bright and colorful with fantastic crunch and flavor, these root crops are fun and easy to grow in containers and planters.
Sow into fertile soil while the weather’s cool and ensure the soil stays lightly moist for a fast growing crop that’s among the earliest to harvest.
And remember to succession-sow for a steady supply of peppery roots before the weather warms up!
Are you growing radishes in containers? Let us know in the comments section below!
And for more information about growing radishes, have a read of these guides next:
