What Not to Plant Near a Black Walnut Tree

Black walnut trees are prized for their beautiful wood and delicious nuts, but they can also be finicky when it comes to their surroundings. One of the biggest challenges facing gardeners is deciding what to plant near a black walnut tree. While many plants will thrive in the shade of a black walnut, others will struggle or even die. Here are some plants that you should avoid planting near a black walnut tree:

Avoid Planting Solanaceous Plants Near a Black Walnut Tree

The Solanaceae family of plants includes nightshades like tomatoes, peppers, eggplants, and potatoes. These plants are particularly sensitive to the chemical compound juglone, which is found in the leaves, bark, and roots of black walnut trees. Juglone is a natural herbicide that can kill or stunt the growth of plants that are sensitive to it. If you plant solanaceous plants near a black walnut, you may notice that they wilt, turn yellow, or die off entirely. It's best to avoid planting these types of plants near a black walnut tree altogether.

Avoid Planting Certain Trees Near a Black Walnut Tree

Black walnut trees can also be picky when it comes to other types of trees that are planted nearby. They produce juglone, which can be toxic to some neighboring trees. Some of the trees that are particularly susceptible to juglone include apple trees, birch trees, black cherry, and hackberry trees. If you plant these types of trees near a black walnut tree, you may notice stunted growth, yellowing leaves or they may even die off. It's best to do your research before planting any trees near a black walnut tree or to consult with a local arborist before making your selection.

Avoid Planting Certain Flowers Near a Black Walnut Tree

Some flowers are also sensitive to juglone and should not be planted near a black walnut tree. Some of these flowers include lilies, asters, hydrangeas, and rhododendrons. These plants may struggle or even die when planted near a black walnut tree. Instead, consider planting shade-loving native plants that are tolerant of black walnut's growing conditions.

Avoid Planting Vegetables Near a Black Walnut Tree

If you're hoping to grow a vegetable garden near a black walnut tree, be aware that some vegetables may not thrive. Plants in the cucumber family, such as cucumbers, cantaloupes, and zucchinis, are particularly sensitive to juglone. Other vegetables that may struggle include beets, carrots, and onions. Instead, consider planting vegetables that are tolerant of black walnut trees, such as asparagus, peppers, and tomatoes.

The Bottom Line on Planting Near a Black Walnut Tree

While black walnut trees are beautiful and produce delicious nuts, they can be challenging when it comes to selecting the right plants to grow nearby. To avoid killing off your plants or stunting their growth, do your research before deciding what to plant near a black walnut tree. Avoid planting solanaceous plants, certain trees and flowers, and vegetables that are particularly sensitive to juglone. Instead, opt for shade-loving plants that are tolerant of juglone and can thrive in black walnut's unique growing conditions.