Kohlrabi, the quirky German turnip (or cabbage-turnip, if you prefer), is a fascinating veggie. Its alien-like appearance and subtly sweet, crunchy taste make it a garden favorite for many. But even the most enthusiastic kohlrabi cultivators need a little help. And that's where companion planting comes in. Think of it as inviting the right friends to your kohlrabi's garden party, ensuring everyone has a good time (especially you, with a bountiful harvest!). This isn't just about putting plants next to each other; it's about leveraging the natural synergies between them to create a thriving, pest-resistant, and productive ecosystem.
Before we dive into the rockstars of kohlrabi companion planting, let's quickly touch on why it works. Companion planting is based on several principles:
With that in mind, let's get to the main event.
Selecting the right companions for your kohlrabi is crucial for a successful garden. Here are some top-performing plants that will help your kohlrabi thrive:
1. Dill: Dill is a superstar in the companion planting world. It attracts beneficial insects like ladybugs and hoverflies, which prey on aphids, cabbage worms, and other pests that love to munch on kohlrabi. Plus, dill's feathery foliage adds a lovely aesthetic touch to your garden. Planting dill around your kohlrabi is like hiring a bodyguard for your crop - a fragrant, effective bodyguard. Consider succession planting dill as the season progresses to ensure a continuous supply of pest-fighting allies.
2. Chamomile: Chamomile is known for its calming properties - and it extends those benefits to your garden. It attracts beneficial insects and can improve the overall health of your kohlrabi. It also has antifungal properties, helping to prevent diseases that might affect your kohlrabi. Chamomile's gentle presence encourages a harmonious environment, allowing kohlrabi to grow strong and healthy. Regular harvesting of chamomile flowers provides the gardener with a wonderful tea, linking both edible and aesthetic value to a single plant.
3. Mint: Mint is a powerhouse when it comes to repelling pests. While some gardeners are wary of its aggressive spreading, containing it in pots or raised beds makes it an invaluable companion. Mint deters many insects, including the cabbage white butterfly, which lays eggs on brassicas like kohlrabi, leading to voracious caterpillars. Just be mindful of its invasive nature - keep mint in check, and you'll have a pest-free kohlrabi patch. It's a classic case of "good fences make good neighbors," even in the garden.
4. Rosemary: Rosemary is a culinary and garden champion. Its strong scent deters cabbage moths and other pests that plague kohlrabi and its brassica brethren. Rosemary also has the added benefit of attracting pollinators and can be a beautiful, fragrant addition to your garden. Like mint, rosemary can become quite large, so make sure you have the room. Additionally, it can be harvested and dried for cooking, enhancing the benefits of your garden setup.
5. Nasturtiums: Nasturtiums are known as trap crops, meaning they attract pests away from your kohlrabi. Aphids and other pests are drawn to nasturtiums, giving your kohlrabi a break. Moreover, nasturtiums are edible, and their vibrant flowers add beauty to your garden. Planting these is a win-win. They act as a sacrificial lamb, protecting your main crop while providing a colourful and edible garnish.
6. Marigolds: Marigolds are the guardians of the garden. Their strong scent repels nematodes and other soil pests, which can damage the roots of your kohlrabi. They also attract beneficial insects. Marigolds are also easy to grow and provide a bright splash of color. Using marigolds is like having security guards, adding both protection and beauty to the vegetable patch. Consider different varieties for added visual interest and pest control effectiveness.
Just as some plants are kohlrabi's best friends, others are not so compatible. Avoiding these plants can prevent competition and ensure optimal growth for your kohlrabi. Knowing these not-so-friendly pairings is just as important as choosing the right companions.
1. Beans: While beans are excellent companions for many crops, they may not be the best choice for kohlrabi. They can compete for nutrients and space, potentially hindering the growth of your kohlrabi. The nitrogen-fixing properties of beans don't particularly benefit kohlrabi, as it doesn't have a high nitrogen requirement. If you're growing beans, keep them at a distance from your kohlrabi beds.
2. Strawberries: Strawberries can sometimes harbor pests that might attack kohlrabi. Plus, they can compete for resources, and their spreading nature may not be ideal in the same space as kohlrabi. Strawberries are also heavy feeders. As such, they compete for nutrients, water, and sunlight with your kohlrabi. This can lead to smaller kohlrabi bulbs and a reduced yield. Consider separating these two in the garden to avoid any negative impact.
3. Fennel: Fennel is infamous in companion planting. It is known to inhibit the growth of many plants, including kohlrabi. The volatile oils released by fennel can disrupt the growth of neighboring plants. The presence of fennel nearby is almost guaranteed to slow the development and success of your kohlrabi plants. Avoid growing fennel anywhere near your kohlrabi, or you might find your harvest disappointing.
Beyond companion planting, several other strategies can help you get the most out of your kohlrabi crop. Follow these tips for a bountiful harvest:
1. Soil Preparation: Kohlrabi thrives in well-drained, fertile soil rich in organic matter. Amend your soil with compost or well-rotted manure before planting. A soil pH of 6.0 to 7.5 is ideal for optimal nutrient absorption. Conduct a soil test to determine any deficiencies, as this helps in planning and improves growth.
2. Watering: Kohlrabi needs consistent moisture. Water regularly, especially during dry spells, to prevent the bulbs from becoming woody or splitting. Aim to water deeply but infrequently, rather than shallowly and often. Mulching around your kohlrabi plants helps retain moisture and suppress weeds, contributing to consistent moisture.
3. Sunlight: Kohlrabi needs at least six hours of sunlight per day. Choose a planting location that receives ample sunlight. In hotter climates, partial shade during the hottest part of the day can prevent bolting. Correct sun exposure is vital for the proper development of your kohlrabi bulbs.
4. Pest Control: While companion planting will help deter pests, it's always a good idea to monitor your plants regularly. Handpick any pests you find, and use organic pest control methods if necessary. Regular inspection allows you to catch potential problems early and take preventive measures. Consider row covers for extra protection early in the season.
5. Harvesting: Harvest kohlrabi when the bulbs are about 2-3 inches in diameter. They become woody and less palatable as they mature. Harvest regularly to encourage new growth. Gently pull the bulb from the soil, or use a trowel to loosen the soil. The fresh, tender bulbs are the real reward of the season!
Here are some frequently asked questions about kohlrabi companion planting:
Dill, chamomile, rosemary, nasturtiums, and marigolds are excellent choices for companion planting with kohlrabi. They attract beneficial insects, deter pests, and improve soil health.
Avoid planting kohlrabi near beans, strawberries, and fennel. These plants can compete for resources or negatively affect kohlrabi's growth.
Companion plants can deter pests, attract beneficial insects, improve soil health, and suppress weeds, creating a healthier and more productive environment for kohlrabi.