Sasha CampbellKnowing which companion plants to pair with radishes can help you grow a healthy, successful crop.
The key is to pick plants that won’t harbor pests or compete for nutrients, water, and light. Otherwise, your radish may struggle.
Plan your garden layout carefully and pay attention to where each crop is planted. However, companion planting is not an exact science, and results may vary depending on your climate, soil, and local pest problems.
Good Companion Plants for Radish
Radishes are known for their vibrant color, robust flavor, and easy-to-grow nature. But they don’t have to grow alone.
Many great companion plants can do wonders for your radish crop. To maximize their production, consider pairing your radishes with these plants:
- Peppers
- Chervil
- Cucumbers
- Broccoli
- Spinach
- Onions
- Kale
- Leaf lettuce
- Parsnip
- Marigold
- Pole beans
- Shallots
- Tomatoes
- Squash
- Peas
- Oregano
- Leeks
- Borage
- Nasturtiums
- Dill
- Petunias
- Beets
- Eggplant
- Carrots
- Garlic
- Cauliflower
We’ve included some brassicas on the good list because many gardeners successfully grow them alongside radishes. However, since brassicas can attract similar pests such as flea beetles, some gardeners prefer to keep them separate.
So, if you have a problem with these beetles, keep brassicas away when growing radishes.
What NOT to Plant with Radish
As highlighted, not every plant does well with radishes.
Before you decide which plants to grow alongside your radishes, below is a list of those you may want to avoid.
Some gardeners have had great success planting some of these together with radishes. However, others prefer to avoid pairing them with radishes due to possible competition or pest issues.
- Hyssop
- Corn
- Fennel
- Pumpkins
- Sunflowers
- Kohlrabi
- Turnips
- Mint
- Rosemary
- Potatoes
- Melons
Additionally, these plants may be a problem when planted too close together. Large spreading plants such as pumpkins and melons may crowd radishes and compete for sunlight and nutrients.
So, give your radishes some distance from the plants mentioned above. Doing so will help your radishes reach harvestable size.
How to Grow Radishes
Radishes can be sown in the spring or fall. However, they prefer cool weather and may bolt or become pithy when temperatures consistently rise above 70°F.
Plant radishes in early spring once the soil can be worked, or in late summer for a fall crop.
Radishes also mature quickly. Many varieties mature in about a month. Therefore, you can sow them in any empty area or between rows of compatible vegetables, as listed above.
Select a spot with at least 6 hours of sunlight per day. Radishes grown in the shade will use all their energy to produce larger leaves.
Plant them in any well-drained soil that is slightly acidic or neutral, with a pH of 6 to 7.
Thin seedlings to about 2 inches apart once they are a few inches tall. But space larger varieties, like daikons, four to six inches apart.
Fertilizer Requirements
Generally, you do not need to fertilize this crop if the soil is already fertile.
However, if your soil is poor, the best fertilizers for radishes have more potassium and phosphorus. Potassium and phosphorus support healthy root development and overall plant growth.
Garden Pests
Aphids can damage radish plants by sucking out the plant’s sap [1]. Cabbage loopers also love to eat young greens.
Cutworms are another common garden pest that may feed on young radishes as they grow. Other garden pests that may cause damage include cabbage maggots, slugs, snails, and flea beetles.
Please take the necessary steps to identify and eliminate them from your garden.
Plant Diseases
Knowing which diseases affect radishes is also important for keeping your crop healthy.
Some common plant diseases affecting radishes include black root rot, Fusarium wilt, downy mildew, and white rust [2].
However, following a few best practices can help prevent these diseases.
First, plants should be planted in well-drained soil with plenty of air circulation around each plant. Second, become familiar with and practice crop rotation. Finally, choose good companion plants for your crops.
If your crops are affected by plant diseases, you can try natural methods to control them.
How to Harvest
You can harvest your garden radishes three to five weeks after planting. Harvest when the roots are about 1 inch across, depending on the variety.
You should also feel or see the radish’s “shoulder” or top portion pressing against the topsoil.
Storing
If you’ve got a lot of radishes and need to store some, that’s doable. But there are a few things to keep in mind when you’re storing radishes.
First, ensure they are completely dry before storage. Next, store them in a plastic bag in the refrigerator’s crisper drawer.
If your radishes have any radish greens, you can store those separately in the fridge. However, use them within 2 days.
Where to Buy Seeds
You can buy quality seeds online or at your local nursery, but if you are growing an organic garden, choose organic seeds.
Takeaway
To sum up, when it comes to companion planting with radishes, it is essential to choose wisely. Some plants pair well with them, while others can cause problems for your crop.
Researching and experimenting with different plants in your garden is good practice. Doing so will help you determine which plants work best with your radishes.
With some trial and error, you can create a thriving garden oasis that allows all your plants to reach their full potential.
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