Introduction

Black walnut trees are a beautiful addition to any landscape, but they can also be a problem for gardeners. The roots, leaves, and bark of the black walnut tree contain a chemical called juglone, which can be toxic to certain plants. If you're planning a garden near a black walnut tree, it's important to know what not to plant to ensure your plants thrive.

Plants to Avoid

There are certain plants that are particularly susceptible to the effects of juglone, and should be avoided when planting near a black walnut tree. These plants include:

Tomatoes

Peppers

Eggplant

Apple trees

Birch trees

Azaleas

Rhododendrons

Lilies

These plants are all sensitive to juglone and may exhibit stunted growth, yellowed leaves, or early death when planted near a black walnut tree.

Plants That Can Tolerate Juglone

While there are some plants that can't tolerate juglone, there are others that are quite tolerant of the chemical. If you're looking to plant near a black walnut tree, consider these options:

Hostas

Yarrow

Daylilies

Black-eyed susans

Iris

Hydrangea

Boxwood

Holly

These plants have all been found to be relatively tolerant of juglone and can thrive near a black walnut tree.

Tips for Planting near a Black Walnut Tree

If you're planning a garden near a black walnut tree, there are a few tips to keep in mind:

Avoid planting within the drip line of the tree, as this is where the concentration of juglone is highest.

Consider planting in raised beds or containers to avoid the effects of juglone on your plants.

Test your soil for juglone before planting. If you find a high concentration, consider planting only juglone-tolerant plants.

Monitor your plants closely for any signs of stress, and adjust your planting plan accordingly.

Conclusion

While a black walnut tree can be a beautiful addition to your landscape, it's important to know what not to plant near it. By avoiding sensitive plants and choosing those that are tolerant of juglone, you can ensure a beautiful and thriving garden near your black walnut tree.