What to Plant Around a Walnut Tree

Walnut trees are a valuable addition to any landscape, providing both shade and food in the form of walnuts. However, many people are unsure what to plant around these trees due to the potential allelopathic effects of the walnut's roots and leaves. Allelopathy occurs when a plant releases chemicals that inhibit the growth of other plants. In the case of walnut trees, these chemicals are called juglones and can be harmful to certain plants. So, what can you plant around a walnut tree? Let's explore some options.

Plants to Avoid

Before delving into what you can plant around a walnut tree, it's important to know what to avoid. Certain plants are highly susceptible to juglones and should not be planted within the root zone of a walnut tree. These include tomatoes, potatoes, peppers, eggplants, blueberries, and azaleas.

Plants that Can Tolerate Juglones

While many plants can't tolerate the presence of juglones, there are some that can. These include:

Blackberry bushes

Strawberry plants

Grape vines

Most herbs, including parsley, oregano, and thyme

Most vegetables, including lettuce, cabbage, and carrots

Most flowers, including marigolds, asters, and irises

It's important to note that while these plants can tolerate juglones to some extent, they may still display reduced growth or other negative effects.

Companion Planting with Walnut Trees

Companion planting is the technique of planting different crops in close proximity to one another to maximize growth and health. While the allelopathic effects of walnut trees can make it more challenging to find compatible companion plants, it's still possible to create a successful permaculture design. Here are some companion planting ideas for walnut trees:

Plant clover or vetch as a cover crop to fix nitrogen in the soil

Grow comfrey or yarrow around the base of the tree to help improve soil health

Plant chives or garlic near the tree to help deter pests

Grow sunflowers or corn near the tree to provide a natural trellis support

These are just a few ideas, and the best companion planting strategy will vary depending on the specific conditions of your site.

Conclusion

While it's true that growing plants around a walnut tree requires some careful consideration, it's certainly not impossible. By choosing plants that can tolerate juglones, avoiding those that can't, and using companion planting techniques, you can create a thriving ecosystem around your walnut tree.