What Can You Plant Under a Black Walnut Tree

Black walnut trees are popular for their dark wood and nutritious nuts, but did you know that they also release a chemical called juglone that can be toxic to certain plants? If you have a black walnut tree on your property, you may be wondering what plants can safely grow under its canopy. In this article, we'll explore some options for plants that can thrive alongside your black walnut tree.

Understanding Juglone

Juglone is a natural compound found in all parts of the black walnut tree, including leaves, bark, and nuts. While it doesn't harm the tree itself, juglone can be toxic to plants within a certain radius of a black walnut tree. The compound is released through the roots and into the soil, where it can remain for years.

However, not all plants are affected by juglone to the same degree. Some species are completely resistant to the chemical, while others are more sensitive. By choosing the right plants for your garden, you can create a thriving ecosystem under your black walnut tree.

Plants to Avoid

Before we dive into the plants that can grow under a black walnut tree, it's important to identify the plants that should be avoided. These include:

Tomatoes

Peppers

Eggplants

Potatoes

Blueberries

Azaleas

Rhododendrons

These plants are highly sensitive to juglone and may struggle to survive under a black walnut tree.

Plants That Can Thrive

While some plants may struggle to grow under a black walnut tree, there are many that can thrive despite the presence of juglone. Here are some options:

Ferns - many species of ferns are resistant to juglone and can add a lush, green carpet to your garden.

Hostas - these shade-loving plants can tolerate juglone and come in a variety of sizes and colors.

Heuchera - also known as coral bells, these plants have vibrant foliage and can grow well under a black walnut tree.

Lamium - this low-growing ground cover has variegated leaves and delicate flowers that can add interest to your garden.

Wildflowers - many species of native wildflowers, such as trilliums and bloodroot, can grow well under a black walnut tree.

Remember to do your research before planting anything under your black walnut tree. Consider factors such as light levels, soil acidity, and water requirements to ensure that your chosen plants will thrive in their new environment.

Caring for Plants Under a Black Walnut Tree

To ensure that your plants stay healthy under a black walnut tree, there are a few things you can do:

Provide adequate water - the tree's roots can compete with your plants for water, so be sure to water them regularly.

Test your soil - juglone can make the soil more acidic, which may affect the growth of your plants. Consider testing your soil and adding lime if necessary.

Remove fallen leaves and nuts - these may contain higher concentrations of juglone, so it's important to keep them from accumulating on the soil.

With a little planning and care, you can create a beautiful and thriving garden under your black walnut tree.

Conclusion

While black walnut trees can release a toxic chemical called juglone, there are many plants that can thrive under their canopy. By avoiding sensitive plants and choosing the right species for your garden, you can create a lush and healthy ecosystem under your black walnut tree. Remember to provide adequate water, test your soil, and remove fallen leaves and nuts to ensure the health of your plants. Happy gardening!