What Plants Will Grow Under a Black Walnut Tree

Black walnut trees are cherished for their beautiful lumber and rich nutty taste. However, if you have one in your yard, you may have discovered that it can be challenging to grow many plants underneath it. This is because the black walnut tree produces a chemical that can be toxic to some plants. Here, we will explore the plants that can thrive under a black walnut tree.

Why Black Walnut Trees are Challenging to Grow Under

Black walnut trees produce a chemical called juglone, which is toxic to some plants. The chemical occurs naturally in all parts of the tree, but it is most concentrated in the roots and leaves. The juglone can leach into the soil, making it inhospitable for many plants. Juglone can affect plants in different ways, including stunting growth or killing them outright.

Plants that are Resistant to Juglone

Although many plants struggle to grow under black walnut trees, some have evolved to tolerate juglone. Here are some plants that can thrive in the presence of juglone:

1. Ferns: Ferns are often an excellent choice for planting under a black walnut tree since they are resistant to juglone. They love the shade and moist soil at the base of a tree. Some ferns to consider include Christmas fern, lady fern, and Japanese painted fern.

2. Hostas: Hostas come in a variety of colors and sizes, making them a versatile choice for any garden. They also thrive in the shade and can tolerate juglone. Consider planting varieties like June, Patriot, or Royal Standard.

3. Wild Ginger: Wild ginger is a ground cover plant that grows quickly and can tolerate juglone. It has heart-shaped leaves and produces purple flowers in the spring, making it an attractive choice for any garden.

4. Astilbes: Astilbes are known for their delicate flowers and feathery foliage. They are well-suited for planting under a black walnut tree since they prefer shade and moist soil. They also have a high tolerance for juglone.

Beware of Sensitive Plants

It is essential to know which plants to avoid when planting under a black walnut tree. Some plants are highly sensitive to juglone and should never be planted near a black walnut tree. These plants include:

1. Apple trees: The roots of an apple tree are highly sensitive to juglone and should never be planted near a black walnut tree.

2. Tomatoes: Tomatoes are also highly sensitive to juglone and should never be planted near a black walnut tree.

3. Blackberries and Raspberries: These plants are highly sensitive to juglone, and planting them near a black walnut tree can stunt their growth or even cause them to die.

Conclusion

Growing plants under a black walnut tree can be challenging due to the presence of juglone. But, with careful consideration of juglone-resistant plants, you can create a beautiful and thriving garden. Remember to avoid planting sensitive plant species near black walnut trees to ensure healthy and robust growth.