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Companion Planting with Fennel: A Guide to Growing Your Garden

companion planting with fennel

The Benefits of Companion Planting with Fennel

Companion planting is the practice of growing different plants together that have a symbiotic relationship. When it comes to fennel, there are several benefits to companion planting:

Pest Control

Fennel is a natural insect repellent, particularly for slugs and snails. By planting fennel alongside other plants, you can help protect them from these pests.

Improved Soil Quality

Fennel is a nutrient accumulator, which means it absorbs nutrients from the soil and stores them in its leaves. When fennel decays, it releases those nutrients back into the soil, improving its quality for other plants.

Improved Flavor

Some plants, such as tomatoes, have been shown to have improved flavor when grown near fennel. This is likely due to the release of volatile oils from the fennel plant.

The Best Companion Plants for Fennel

Now that we know the benefits of companion planting with fennel, let's take a look at some of the best companion plants to grow alongside it:


As mentioned earlier, tomatoes benefit from being grown near fennel. This is because fennel attracts predatory insects that help control tomato pests.


Cucumbers and fennel make great companions because they both repel common cucumber pests like aphids and spider mites.


Fennel is also a good companion for brassicas like broccoli, cabbage, and cauliflower. Brassicas are prone to attack by caterpillars, but fennel attracts parasitic wasps that help control these pests.


Beans and fennel also make great companions because fennel repels bean beetles, which can be a problem for bean plants.

How to Plant Fennel with Companion Plants

Now that we know which plants make good companions for fennel, let's talk about how to plant them together:

Planting Distance

When planting fennel with other plants, it's important to give each plant enough space to grow. Fennel should be planted at least 18 inches away from other plants to avoid competition for nutrients and water.

Companion Planting Layout

One effective companion planting layout is to plant fennel in the center of a garden bed, with other plants arranged in concentric circles around it. This allows fennel to act as a natural barrier against pests and provides easy access to all plants in the bed.

Succession Planting

Succession planting is another technique that can be used with companion planting. This involves planting new crops as soon as old ones are harvested, allowing you to maximize your garden space and keep the soil healthy.

Common Mistakes to Avoid When Companion Planting with Fennel

While companion planting with fennel can be incredibly beneficial, there are some common mistakes to avoid:

Planting Fennel Too Close Together

Fennel is a large plant that requires a lot of space to grow. If you plant fennel too close together, it can lead to stunted growth and poor yields.

Planting Fennel with Incompatible Plants

Not all plants make good companions for fennel. For example, fennel should not be planted near dill or coriander as they can cross-pollinate and produce undesirable flavors in the fennel.


Fennel prefers well-draining soil and does not like to be overwatered. Overwatering can cause root rot and other problems that can affect the health of companion plants as well.

Frequently Asked Questions

1) Can I plant fennel with other herbs?

Yes, fennel makes a great companion for many herbs including rosemary, sage, and thyme.

2) Can I plant fennel near my vegetable garden?

Yes, fennel can be planted near your vegetable garden. Just make sure to give it enough space and choose compatible companion plants.

3) Will fennel attract beneficial insects?

Yes, fennel is known to attract beneficial insects like ladybugs, parasitic wasps, and lacewings.

4) Can I harvest fennel and its companion plants at the same time?

Yes, you can harvest fennel and its companion plants at the same time. Just make sure to leave enough space between plants for easy access.

5) How do I know if my fennel is ready to harvest?

Fennel bulbs are typically ready to harvest when they reach 3-4 inches in diameter. The leaves can also be harvested at any time once they have grown to a reasonable size.

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