What Can You Plant Under A Walnut Tree

You can plant a wide range of shade-tolerant vegetables, herbs, and ornamentals under a walnut tree if you choose species that can handle the tree’s juglone toxin.
 
The key is understanding that walnut trees produce juglone, a natural chemical that can be toxic to certain plants.
 
So when you’re wondering what can you plant under a walnut tree, the answer isn’t “nothing” — it’s just a matter of picking the right companions.
 
In this post, we’ll explore what you can plant under a walnut tree, why some plants struggle, and the best options for a thriving garden beneath those branches.
 
Let’s dig in.
 

What Can You Plant Under a Walnut Tree?

You can plant plenty of things under a walnut tree, but you need to know which plants tolerate juglone.
 
Juglone is concentrated in the roots, buds, and nut hulls, and it can linger in the soil for years.
 
That means some plants will wilt, yellow, and die, while others won’t even flinch.
 
So the real question isn’t whether you can plant under a walnut tree — it’s what you can plant under it successfully.
 
Here are the plants that actually thrive in that environment.
 

1. Shade-Tolerant Vegetables

Several vegetables grow well under a walnut tree, especially those that don’t mind a bit of shade.
 
Beets, carrots, onions, and parsnips are solid choices that tolerate juglone reasonably well.
 
Squash, melons, and beans also tend to do fine, though beans may struggle a little in heavy juglone soil.
 
If you’re planting under a walnut tree, try corn, too — it’s surprisingly tolerant.
 
Just avoid the nightshade family, because tomatoes, peppers, potatoes, and eggplants are all sensitive to juglone.
 

2. Herbs That Handle Juglone

Herbs are a great option when you’re figuring out what you can plant under a walnut tree.
 
Most culinary herbs are tough and adaptable, so they handle the juglone and shade without much fuss.
 
Try parsley, chives, oregano, thyme, and mint — though keep mint in a pot unless you want it everywhere.
 
Lemon balm and bee balm also do well and attract pollinators to the area.
 
Avoid basil, as it’s one of the more sensitive herbs when planted under a walnut tree.
 

3. Ornamentals and Ground Covers

If you’re not growing food, you can plant plenty of beautiful ornamentals under a walnut tree.
 
Hostas, ferns, astilbe, and coral bells all tolerate juglone and love the shade.
 
Daylilies, daffodils, and crocus are also good picks that come back year after year.
 
For ground cover, try violets, creeping phlox, or wild ginger.
 
These plants fill in the space nicely and keep weeds down under a walnut tree.
 

Why Some Plants Struggle Under a Walnut Tree

Plants struggle under a walnut tree mainly because of juglone, but shade and root competition play a role too.
 
Juglone interferes with respiration in susceptible plants, essentially suffocating their roots.
 
Symptoms include yellowing leaves, wilting, stunted growth, and sometimes sudden death.
 
Black walnut is the worst offender, but butternut and hickory trees also produce juglone.
 
The toxin can remain in the soil long after the tree is gone, so even removing the tree doesn’t fix things overnight.
 
That’s why knowing what you can plant under a walnut tree matters so much before you start digging.
 

Tips for Planting Under a Walnut Tree

Planting under a walnut tree takes a little planning, but it’s absolutely doable.
 
First, keep your garden beds at least 50 feet from the trunk if you’re growing sensitive plants.
 
Second, improve the soil with compost to dilute juglone concentrations and boost drainage.
 
Third, use raised beds or containers if you want to grow something sensitive.
 
The physical barrier keeps walnut roots out and gives you more control over what you can plant under a walnut tree.
 
Water consistently, since walnut trees compete aggressively for moisture.
 

1. Raised Beds Are Your Friend

Raised beds are one of the smartest solutions when you want to plant under a walnut tree.
 
Line the bottom with landscape fabric to block walnut roots from creeping in.
 
Fill with fresh topsoil and compost, and you’ve basically created a juglone-free zone.
 
This lets you grow tomatoes, peppers, and other sensitive plants without worry.
 
It’s an easy workaround when you’re determined to plant under a walnut tree.
 

2. Clean Up Fallen Debris

Walnut hulls, leaves, and twigs all contain juglone, so don’t let them pile up in your beds.
 
Rake them away and compost them separately — or just toss them.
 
This reduces the amount of toxin leaching into the soil where you plant under a walnut tree.
 
It also keeps the area tidy and discourages pests.
 
A little maintenance goes a long way.
 

3. Give Plants Room to Breathe

Don’t crowd your plants when you plant under a walnut tree.
 
Good air circulation helps prevent disease, especially in the shade.
 
Space them according to their mature size and prune nearby branches if needed.
 
More sunlight reaching the ground means healthier plants overall.
 
And healthier plants handle juglone much better.
 

So, What Can You Plant Under a Walnut Tree?

You can plant a surprising variety of vegetables, herbs, and ornamentals under a walnut tree.
 
The trick is sticking with juglone-tolerant species like beets, carrots, squash, hostas, ferns, and most herbs.
 
Avoid sensitive plants like tomatoes, potatoes, peppers, and basil unless you use raised beds.
 
With the right choices and a little prep work, you can plant under a walnut tree and enjoy a beautiful, productive garden.
 
Happy planting.