Juglone Resistant Grass

November 16, 2024 Post a Comment

Juglone resistant grass

Black walnuts, like oaks and hickories, cast moderate shade at the ground level, creating ideal growing conditions for the shade-tolerant fine fescue grasses.

Is grass sensitive to juglone?

It is also important to note that many turfgrass species are tolerant of juglone. They, like many other sun-loving plants, are more likely to perform poorly because of the shade of the walnut tree rather than the juglone.

Is juglone toxic to grass?

One example of a tree that uses chemicals to suppress the growth of other plants is the black walnut tree (Juglans nigra), hardy in U.S. Department of Agriculture plant hardiness zones 5 through 9. Black walnut trees produce a toxic chemical known as juglone that can stunt the growth of your grass.

Will ornamental grass grow under black walnut?

Answer: As far as I know and have experienced, all the grasses are ok with juglone, the chemical from black walnut trees. Many monocots and the whole grass family seem to be immune to juglone, so I think you can try most any grass.

How do you neutralize juglone?

Juglone cannot be easily neutralized – and it can persist in your soil for years, so even the most vigilant property owners may find this challenging. Since juglone is present in all parts of the tree but is especially strong in the roots, which extend far beyond the canopy.

How long does juglone stay in the soil?

The toxic effect of the juglone can be degraded in 2 to 4 weeks. In soil, breakdown may take up to two months. Composting of bark for a minimum of 6 months can provide a safe mulch, even for plants sensitive to juglone.

Why won't grass grow under a walnut tree?

Black walnut is what's known as an allelopathic plant, which means it contains a natural poison that kills or interferes with the growth of nearby plants. Black walnut leaves and wood, and especially the roots, contain a powerful chemical called juglone.

Why does grass not grow under walnut trees?

ANSWER: All members of the Family Juglandaceae (Walnut Family), including pecan, butternut and hickory trees as well walnuts, produce and release a chemical called juglone to defend their growing space against encroachment by other plants.

Will clover grow under black walnut trees?

I've found that clover tends to grow better than most forage crops underneath walnut trees. You might establishing a clover blend in these areas.

What plants Cannot tolerate juglone?

Particularly sensitive to juglone are vegetables such as tomatoes, potatoes, eggplants and peppers, and ornamentals such as lilacs, peonies, rhododendrons and azaleas. The symptoms in plants sensitive to juglone range from stunting, yellowing, to partial or total wilting, to complete death.

What plants are not affected by juglone?

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)

Is Kentucky bluegrass juglone tolerant?

Kentucky bluegrass (Poa pratensis) grows in USDA zones 1 through 8, and tall fescue (Festuca arundinacea) thrives in USDA zones 3 through 8. These grasses must be under low stress to survive the juglone contamination, which means that you must keep them well-watered and adequately fertilized.

Can you plant hydrangeas under a black walnut tree?

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.

Can I mow over black walnuts?

If you mow over the walnut nuts it will allow the juglone to release more readily but the grass will usually survive but not exceptionally well. If your mower is set low below 3” the blades will hit the nuts and possibly damage the blades as walnut shells are used as a blasting abrasive.

What ground cover grows under walnut trees?

Trillium spp. Big Leaf Aster (Aster macrophyllus) is just one of several ground cover plant options that are juglone tolerant. No Mow Lawn also grows well under walnut trees, as shown under a group of Walnut trees.

How far does juglone travel?

Because juglone is not very soluble in water it does not spread very far in the soil. Its effect is worst at the edge of the tree's crown, or dripline. However, since the roots may stretch beyond the dripline, in general, the toxic zone around a mature walnut tree is within 50-60 feet of its trunk.

Are tomatoes sensitive to juglone?

Black Walnuts and Tomatoes: As you noted in your email, black walnut trees produce a substance (called juglone) that is toxic to some plants, including tomatoes.

What does juglone do to humans?

Our results show that juglone has multiple effects on cells such as the induction of DNA damage, inhibition of transcription, reduction of p53 protein levels and the induction of cell death.

What will not grow under a black walnut tree?

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

Is juglone toxic to dogs?

Black walnuts contains a toxin called juglone which can cause a vascular disease in horses known as laminitis, but doesn't appear to cause problems in dogs. Eating black walnuts can cause gastric intestinal upset or an obstruction.