Did you know you can grow radishes in spring or fall?
I used to think that radishes were the perfect early spring vegetable. Then I learned that you can also grow them in fall and have been growing them for several months a year ever since. Because they’re so fast growing (seedlings typically emerge 3 to 7 days after you plant), they’re great candidates for succession planting, and you can get several harvests in a single growing season. Plant them between other crops, in containers, or anywhere you can find an empty space. Radishes are typically grown for their spicy and peppery taproot.
There’s so much variety: Radishes come in all kinds of shapes, from the traditional globes to medium oblong shapes and longer daikon types. And you can find every color in the rainbow but blue, even black and white. Little-known fact: The entire radish plant is edible!
- Radish seedlings, or microgreens, add a kick to salads and sandwiches.
- The mature foliage can be used in sauces, soups, salads or served on its own.
- And even the seed pods can be eaten straight off of the plant, tossed in salads or pickled!
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Fall and spring radish varieties
Although you can plant the same seeds you traditionally grow in spring for a quick fall crop, there is also an entire group considered “fall radishes.” Because temperatures get too warm before they mature, they aren’t good candidates for spring sowing, but they are very cold tolerant, and you can harvest these little nuggets until the ground freezes every year. Scroll down to learn about the key differences between the two types and meet some varieties I think you should try in the gallery at the bottom of the article. Read on to learn how to grow them in both spring and fall!
Where to buy radish seeds
- Renee's Garden Seeds
- Burpee, 800-888-1447
- Jung Seed 800-297-3123
- Pinetree Garden Seeds 207-926-3400
How to grow the best radishes
Radishes will germinate in temperatures as low as 40 degrees F. For a fall crop of radishes, sow seeds 4 to 6 weeks before your average first fall frost. For a spring crop, sow them 4 to 6 weeks before the average last frost date. Check here to find your average frost dates.
How to plant radishes
The planting method is the same for all radish types:
- Direct sow seeds outdoors about ½ inch deep, spacing them 1 inch apart in rows 12 inches apart and cover loosely with soil.
- Soak the soil when you plant, then make sure seedlings and growing plants get about 1 inch of water per week after that.
- Sow seeds every 10 days or so for a continuous harvest. Read the seed packet and stop when your plants won’t have enough time to mature.
Don't forget to mulch!
All radishes are tolerant of frost. In fact, fall varieties can survive temps as low as 20 degrees F. However, to keep the soil from freezing (so you can continue to harvest), throw down a 4-inch layer of straw for mulch as soon as you’re expecting temperatures below 28 degrees F.
Straw mulch is also a good idea in spring. It’ll help keep the soil between 60 and 70 degrees F to prevent bolting, or early flowering, which negatively impacts radish shape and flavor.
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Thinning radish seedlings
“Thinning” is undoubtedly the most important step of growing radishes. Once the seedlings are 2 inches tall or about a week old, thin them to about 3 inches apart. To thin, snip the greens at the soil line. The photos above show how sparse your thinned row may look at first, but you need to do it to give those roots a chance to fill out. Don’t waste those tops, though: Wash the microgreens up and put them in a salad!
It can be tricky to tell if your radishes are ready to harvest: If pulled to early, they could be too small for eating; and if left too long, they become woody and tough.
I use two methods when deciding if my radishes are ready to harvest. First, I scrape away the soil from the top of the root using my fingers or a small trowel. Roots of mature radishes are roughly 1 inch in length, depending on the variety (again, refer to seed packet). If the roots are still too small, I recover them with soil and let them continue to grow.
But sometimes I just use the “go for it” method: I pull a couple out and spot check. If the root is large enough to eat and still firm to the touch, it is time to harvest. Spring radishes mature quickly, so I check mine every few days. You won’t need to do this as often for fall types since they store well in the ground past maturity, but you should pull them before the ground freezes.
What's wrong with my radishes?
Unfortunately, not every radish comes out of the ground as perfect as these. Here are a few problems you might encounter and what causes them.
- Super spicy roots= high soil temperature, left in the ground too long
- Woody and pithy roots= high soil temperature, inconsistent watering
- Cracked roots= left in the ground for too long, inconsistent watering
- All greens and no root= high air temperatures, crowded planting, not enough sun
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Once the radishes leave the ground, cut off the greens, wash the roots and store them in the refrigerator. Storage time depends on the variety of radish you decided to grow. When you cut the tops from your radishes, don’t toss them. Instead, add them to salads, soups, sauces or sautés. They’ll store well for a few days in the refrigerator: Just wash, pat them dry and place them in a resealable plastic bag.
Radish seed pods
Radish seed pods are not only edible, but you might be surprised at how delicious they are! You’ll need to let the plant bolt, or flower, for seed pods to form. They are slightly spicy but milder than the root. Harvest radish seed pods when they are young and bright green, or they turn bitter and woody. Just rinse and pat them dry before storing for up to a week in the refrigerator. Eat them raw, in salads or sauteed in a stir fry. I personally love to pickle them!
Fall vs. Spring radishes
There are a few differences between spring and fall radishes, we've compared the two below:
- Mature in 35 days or less
- Become bitter when overripe, left in ground for too long or temperatures rise
- Store well for only a week or so
- Greens are soft and small, have a mild bite and slightly fuzzy texture
- Start to bolt when temperatures are consistently above 70 degrees F
- Can take 30 to 80 days to mature
- Consistent fresh, crisp taste, whether harvested early or late
- Store well for months
- Abundant greens are tender and mild and can be picked before the root matures without affecting growth
- Start to die off when temperatures consistently stay below 20 degrees F
Radish Seeds We Recommend:
'Watermelon' radish seeds
Garden Party Radish seed mix
Crimson Crunch radish
Radish varieties to grow
There are a wide range of radishes you can grow in spring and fall. Check out the gallery below that includes both spring and fall radishes, each type is noted for when it is best grown.