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What can you not plant under a walnut tree?

Author

Sophia Bowman

Updated on March 06, 2026

What can you not plant under a walnut tree?

However, tomatoes seem to be the most sensitive to growing under black walnuts.

Plants Sensitive to Juglone

  • Asparagus.
  • Cabbage.
  • Eggplant.
  • Peppers.
  • Potatoes.
  • Rhubarb.
  • Tomatoes.

Similarly one may ask, what can you not plant near a walnut tree?

Avoid planting vegetables that are sensitive to juglone, such as asparagus, cabbage, eggplant, peas, peppers, potatoes, rhubarb and tomatoes.

Furthermore, do walnut trees kill other plants? In most cases, the damage caused by black walnuts to other plants is a combination of the presence of juglone in the soil, and the competition for light, water and nutrients. However, juglone can cause severe damage and even kill solanaceous crops (tomatoes, potatoes, peppers and eggplant).

Similarly, it is asked, what will grow under a walnut tree?

  • Black walnut (Juglans nigra) is considered one of our most valuable native hardwood lumber trees and is often used in large scale landscapes.
  • Box elder Acer negundo.
  • Japanese maple Acer palmatum & cvs.
  • Red maple Acer rubrum.
  • Sugar maple Acer saccharum.
  • Ohio buckeye Aesculus glabra.
  • Yellow buckeye Aesculus octandra.

Are all walnut trees toxic?

Black walnut trees are considered toxic but are unique from most other toxic plants. They are safe to all livestock except horses, and horses are generally only affected by shavings made from the tree. The roots of the black walnut tree produce an organic compound called juglone.

Will Lily of the valley grow under black walnut trees?

Lily of the Valley One good toxin deserves another. I tested extra bits of this resilient, fragrant beauty under the Black Walnut trees a few years ago, and they are spreading happily, much as they do elsewhere.

Will hostas grow under walnut trees?

Black walnut trees are one of the best trees to plant hostas under.

Can you eat walnuts from a tree?

A pitted shell encases a fibrous, leather sheath that splits as the nuts begin to ripen in the fall and indicates that walnut tree harvesting is nigh. Once you are done harvesting the walnuts, you can eat them right away, but keep in mind they won't be quite like those purchased ones at the grocers.

What is the difference between a walnut tree and a black walnut tree?

Comparing the three common walnut tree species, butternut (white walnut) tree has oblong-lanceolate leaves. In contrast, English and black walnut trees have shorter, more rounded leaflets. The difference between black walnut and other species is that its leaves have a small terminal leaflet that sometimes is missing.

What grows well under black walnut trees?

Shrubs Tolerant to Juglone
  • Barberry (Berberis spp)
  • Hazelnut (Corylus americana)
  • Daphne (Daphne spp)
  • Forsythia (Forsythia spp)
  • Witchhazel (Hamamellis spp)
  • Rose of Sharon (Hibiscus syriacus)
  • Snowball Hydrangea (Hydrangea arborescens)
  • St. Johnswort (Hypericum prolificum)

Where do walnut trees grow best?

Juglans nigra, the eastern American black walnut, is a species of deciduous tree in the walnut family, Juglandaceae, native to North America. It grows mostly in riparian zones, from southern Ontario, west to southeast South Dakota, south to Georgia, northern Florida and southwest to central Texas.

Are walnuts poisonous to dogs?

But black walnuts (a type of walnut not commonly eaten by people) are toxic for dogs. The symptoms of toxicity are vomiting, muscle weakness and tremors, a high temperature, and seizures. These types of nuts should never be fed to dogs.

Can roses grow near black walnut trees?

Roses, peonies, lilies, tomatoes and many other annuals, perennials, shrubs and vegetables may turn yellow, wilt and die if juglone is in the soil, Taylor says. That doesn't mean you can't have a beautiful garden around a black walnut tree. You just have to choose plants that can tolerate juglone.

Will azaleas grow under walnut trees?

Black walnut trees secrete a biochemical substance known as Juglone. Avoid planting the following near or under the canopy of black walnut trees: Apples, white birch, mountain laurels, blackberries, blueberries, tomato plants, azaleas, chrysanthemum, crocus, hydrangeas, lilacs and rhododendron.

Are English walnut trees self pollinating?

Pollination Requirements: English Walnuts are partially self-fertile. Plant two varieties for heavier crops.

Do walnut trees have deep roots?

The mature walnut tree's root system is a combination of a taproot from its youth, downward-angled roots and horizontal roots near the soil surface. Expect the vast majority of the tree roots to be no deeper than 3 to 7 feet in the soil.

Will daffodils grow under walnut trees?

Gardeners with black walnut trees need to select plants that can tolerate juglone. The good news is that the varieties you mention, snowdrops, Spanish bluebells and winter aconite, are all listed as juglone resistant. Other options include alliums, crocus, daffodils, grape hyacinths, hyacinths, scilla and chinodoxa.

Will ginseng grow under black walnut trees?

Ginseng prefers the north and east-facing sites on well-drained slopes under a forest canopy of approximately 70 to 90% shade. Certain species of trees, such as tulip-poplar, sugar maple, and black walnut are indicators of productive ginseng sites.

How much is a black walnut tree worth?

Black walnut logs bring premium prices, and have since the 1700s, with single trees bringing up to $20,000. Bruce Thompson, author of “Black Walnut For Profit,” estimates a mature stand of black walnut trees can bring about $100,000 per acre in timber value alone.

Do walnut trees kill grass?

Black walnut trees produce a toxic chemical known as juglone that can stunt the growth of your grass. You can remove any nuts or leaves that fall from the tree to limit damage to your lawn from juglone and replant the affected areas of your lawn with a juglone-resistant species of grass, such as tall fescue.

Do walnut trees have invasive roots?

The juglone in a mature black walnut tree increases each year and the roots spread farther and farther out from the trunk. It is estimated that the most damage is 50 to 80 feet from the trunk, with the highest concentrations of juglone found right around the drip line of the tree's canopy.

Are green walnuts poisonous?

Fresh green walnuts, on the other hand, offer a taste that few have enjoyed, the primary reason being that they are incredibly bitter. The tree is not considered toxic to humans, and generally will not harm anyone who is not allergic to tree nuts or walnuts specifically.

Can I grow a walnut tree from a walnut?

Walnut trees can be easily grown from seeds by following a few simple steps. Collect walnuts after they fall to the ground. Remove the husks and then place the nuts in water. Before the walnuts will germinate, the nuts need to be exposed to cold temperatures and moist conditions.

Do walnut trees affect tomato plants?

Walnut trees (Juglans spp.) produce a toxic substance known as juglone that is harmful to tomato plants. There is little that you can do to reduce the effect of an existing walnut tree on your tomato plants other than to relocate them away from your walnut tree.

Is Black Walnut poisonous to humans?

The fruit, leaves and roots of black walnut trees contain a chemical, juglone, that can injure other plants. Ingesting even a small amount of pure juglone can cause a serious poisoning effect in humans.

Do black walnut trees kill tomato plants?

Black walnut trees produce a toxin through their leaves, nuts, and roots. This toxin is called juglone and is used by the tree to kill off other plants that compete for water and nutrients. In one day, a plant with nice, green tomatoes can severely wilt. Within a few days, the plant may be fully dead.

Are Falling walnuts dangerous?

The City of Toronto's Forestry Department confirms it has no record of anyone ever being hurt by a falling walnut. Smith says the trees are important because, as a native tree to the region, they grow well, support wildlife and rarely have diseases.

How do you make homemade walnut ink?

Process
  1. Collect nuts from a walnut tree. Ones that have already fallen and started to oxidize are fine.
  2. Place nuts in pot.
  3. Cover with water.
  4. Simmered for 8 hours then soaked for another 16.
  5. Strained through a sieve to remove large pieces of husk and the nuts.
  6. Reduced the liquid in half.
  7. Added 1TSP Vinegar, 1TBS Gum Arabic.

Do squirrels eat black walnuts?

The black walnut produces an edible nut that is encased in a thick green or brown husk. Many animals eat these walnuts including squirrels, turkeys, raccoons and bears. Black walnut trees often affect the kinds and densities of plants that grow around them.

Is Walnut safe to burn?

Walnut is a good firewood when compared to other firewoods because of its medium density and ease of burning. It burns clean, is easy to start and has a pleasant aroma. Walnut may not produce quite as much heat when compared to other hardwoods such as Oak, but it is much better than burning a softwood such as Cedar.