What Plants Grow under a Black Walnut Tree

Black Walnut trees are native to North America and can be found in many areas of the continent. These trees are known for their hardwood and high-quality timber, as well as their edible nuts. One of the unique features of the Black Walnut tree is that it produces a toxic substance called juglone, which can inhibit the growth of some plants that grow under its canopy. However, there are several plants that are known to thrive under a Black Walnut tree.

Plants That Grow Under a Black Walnut Tree

Despite the challenges of the juglone, there are several plants that can grow successfully under a Black Walnut tree. Some of the plants that are known to tolerate juglone include:

Hostas

Geraniums

Ferns

Lamb's Ear

Astilbes

Columbines

Phlox

Daylilies

Sedum

Virginia Bluebells

Each of these plants has its unique characteristics that allow it to thrive under a Black Walnut tree. For example, ferns, Lamb's Ear, and Virginia Bluebells all have shallow root systems that make them less susceptible to the effects of juglone. Additionally, many of these plants have evolved to thrive in areas with less sunlight, making them well-suited to growing under the dense canopy of a Black Walnut tree.

How to Grow Plants under a Black Walnut Tree

If you're looking to add some variety to your Black Walnut tree, there are several things you can do to make it easier for plants to grow under the shade of the tree. Here are some tips:

Choose shade-tolerant plants: As we've already mentioned, there are several plants that are known to thrive under a Black Walnut tree. Choosing the right plants for the job will make your life much easier.

Amend the soil: Black Walnut trees require well-draining, slightly acidic soil to thrive. Many of the plants that can grow under a Black Walnut tree require similar soil types. Depending on your soil type, you may need to add compost, sand, or other minerals to make the soil more suitable for your plants.

Be mindful of the juglone: If you're planning on planting any tree or shrub species under your Black Walnut tree, make sure to choose varieties that can tolerate juglone. Additionally, keep in mind that the biggest concentration of juglone will be found in the tree's root zone, so try to plant your other species as far away from the Black Walnut as possible.

Water regularly: Once you've planted your shade-tolerant plants, make sure to water them regularly. The dense canopy of the Black Walnut tree can make it difficult for rainwater to reach the plants growing underneath, so it's important to monitor soil moisture levels and water as needed.

Mulch: Adding a layer of organic mulch around your plants can help to retain moisture in the soil and protect the roots from excess heat or cold. This is particularly important for plants growing under the shade of a Black Walnut tree since they are already at a disadvantage when it comes to receiving nutrients and moisture from the sun.

Conclusion

Growing plants under a Black Walnut tree may seem like a daunting task, but it's definitely achievable with the right tools and knowledge. By choosing the right plants, amending the soil, being mindful of juglone, and providing adequate water and mulch, you can create a beautiful and diverse garden under the shade of your Black Walnut tree. Just be patient and persistent, and you'll be rewarded with a thriving garden that can withstand the challenges of the juglone.