What's new

Welcome to uwmav | Welcome My Forum

Join us now to get access to all our features. Once registered and logged in, you will be able to create topics, post replies to existing threads, give reputation to your fellow members, get your own private messenger, and so, so much more. It's also quick and totally free, so what are you waiting for?

What To Plant Below Black Walnut Timber? — Farm & Animals


Staff member
Mar 15, 2024
Reaction score
Black Walnut timber (Juglans nigra) are well-known for his or her majestic dimension and the wealthy chocolate-brown heartwood that makes them invaluable within the high-end furnishings market. Additionally they produce very flavorful walnuts and may make a beautiful addition to your panorama.

In the event you’re fortunate sufficient to have these spectacular timber in your property, it’s possible you’ll discover landscaping underneath and round them a little bit of a problem. Not all crops can thrive within the soil surrounding Black Walnut timber as a result of biochemical substance they secrete referred to as Juglone.

On this article, we clarify Juglone toxicity and supply sound recommendation that can assist you create a wholesome, comfortable panorama round your Black Walnut timber. Learn on to study extra.

Why Do Black Walnut Timber Produce Juglone?​

Why Do Black Walnut Trees Produce Juglone?

Juglone is a chemical produced by Black Walnut timber as a protecting response to make sure their survival. Sadly, this compound might be dangerous to many plant species.

Juglone is generally leached from the timber’ roots into the soil, however it will possibly additionally drip from the leaves onto the bottom.

Contact with Juglone could cause what is named allelopathy (i.e. “loss of life to others). Fortunately, not all crops are negatively impacted by Juglone.

What to Develop Below Black Walnut Timber​

Most grasses and plenty of crops are capable of thrive underneath or close to Black Walnut timber with out succumbing to the results of Juglone. Listed below are some choices to think about:

Eleven Fairly Perennials That Can Face up to Juglone​

  1. Solomon’s Seal (Polygonatum biflorum) – USDA Hardiness Zone: 3-8. This woodland perennial options arching stems and dangling, bell-shaped white flowers.
  2. Virginia Creeper (Parthenocissus quinquefolia) – USDA Hardiness Zone: 3-9. A deciduous vine identified for its vibrant purple fall foliage and five-leaflet leaves. Remember, nonetheless, that this vine can and can fully cowl timber if given half an opportunity. This has the impact of smothering and killing the timber.
  3. Morning Glory (Ipomoea purpurea) – USDA Hardiness Zone: Annual. These colourful, trumpet-shaped flowers bloom within the morning and are available numerous hues.
  4. Shasta Daisy (Leucanthemum x superbum) – USDA Hardiness Zone: 4-9. A traditional perennial with white, daisy-like flowers and a vivid yellow middle.
  5. Wisteria (Wisteria spp.) – USDA Hardiness Zone: 4-9. A vigorous, climbing vine producing cascades of aromatic, pea-like flowers.
  6. Hostas (Hosta spp.) – USDA Hardiness Zone: 3-9. Shade-loving perennials with engaging foliage, out there in numerous sizes and leaf colours.
  7. Aster (Aster spp.) – USDA Hardiness Zone: 3-8. These late-season bloomers provide a burst of shade with their daisy-like flowers, coming in a spread of shades.
  8. Vinca (Vinca minor) – USDA Hardiness Zone: 4-9. Also referred to as periwinkle, this floor cowl options shiny leaves and violet-blue, star-shaped flowers.
  9. Phlox (Phlox paniculata) – USDA Hardiness Zone: 3-8. Tall spikes of aromatic, clustered flowers in vibrant colours make this a backyard favourite.
  10. Ajuga (Ajuga reptans) – USDA Hardiness Zone: 3-10. Low-growing floor cowl with colourful foliage and spikes of small, tubular flowers.
  11. Heucheras (Heuchera spp.) – USDA Hardiness Zone: 4-9. These perennial crops are valued for his or her vibrant foliage and delicate flowers. There are between 35 and 50 species of those US native crops presenting with numerous shades of leaves and topped with dainty blooms.

Shrubs to Plant Beneath Black Walnuts​

Nineteen Juglone Tolerant Timber and Shrubs​

  1. Viburnum (excluding maresii) – There are greater than 150 species and quite a few cultivars inside the Viburnum genus that present quite a lot of selection in stunning shrubs or small timber. These hardy crops have numerous progress habits and flower sorts. Hardiness zones differ by species. [
  2. Flowering Dogwood (Cornus florida) – USDA Hardiness Zone: 5-9. This small tree is understood for its showy, pink or white bracts in spring and colourful foliage within the fall.
  3. American Beech (Fagus grandifolia) – USDA Hardiness Zone: 3-9. This can be a stately deciduous tree with easy grey bark and oval-shaped leaves.
  4. Japanese Redbud (Cercis canadensis) – USDA Hardiness Zone: 4-9. This small, decorative tree is known for its profusion of pink or lavender flowers in early spring.
  5. Japanese Maple (Acer palmatum) – USDA Hardiness Zone: 5-8. This can be a small tree or shrub famend for its beautiful, delicate foliage in numerous colours.
  6. Black Cherry (Prunus serotina) – USDA Hardiness Zone: 3-9. This US native tree produces aromatic white flowers and edible cherries.
  7. Rosa Rugosa (Rosa rugosa) – USDA Hardiness Zone: 2-7. This hardy, low-maintenance rose species has wrinkled leaves and aromatic blooms.
  8. Arborvitae (Thuja occidentalis) – USDA Hardiness Zone: 2-7. These evergreen timber or shrubs are common for his or her dense, pyramidal progress.
  9. White Ash (Fraxinus americana) – USDA Hardiness Zone: 3-9. This tall, deciduous tree has compound leaves and engaging fall shade.
  10. Purple Maple (Acer rubrum) – USDA Hardiness Zone: 3-9. This versatile tree is well-known for its beautiful purple foliage within the autumn.
  11. Sycamore (Platanus occidentalis) – USDA Hardiness Zone: 4-9. This massive deciduous tree has palmate leaves and really distinctive bark.
  12. Tulip Tree (Liriodendron tulipifera) – USDA Hardiness Zone: 4-9. This tall and stately tree bears tulip-shaped flowers because the widespread identify suggests.
  13. Euonymus (Euonymus spp.) – USDA Hardiness Zone: Varies by species. Consists of shrubs and vines with colourful foliage.
  14. Forsythia (Forsythia spp.) – USDA Hardiness Zone: 4-9. These early spring bloomers bear cascades of vivid yellow flowers.
  15. Hibiscus (Hibiscus spp.) – USDA Hardiness Zone: Varies by species. Each hardy and tropical varieties are Juglone tolerant. There are almost 300 member of this genus (Malvaceae). All produce lots of showy flowers. [
  16. Catalpa (Catalpa spp.) – USDA Hardiness Zone: 4-9. Giant deciduous timber with distinctive, broad leaves and showy flowers which transition into lengthy, dangling beans.
  17. Oaks (Quercus spp.) – USDA Hardiness Zone: Varies by species. Various group of timber with important ecological significance.
  18. Privet (Ligustrum spp.) – USDA Hardiness Zone: Varies by species. This group consists of each evergreen and deciduous shrubs which are sometimes used for hedges.
  19. Sumac (Rhus spp.) – USDA Hardiness Zone: Varies by species. These timber are well-known for his or her compound leaves and purple fruit clusters.

Black Walnut (Juglone) Tolerant Evergreens​

For an much more complete listing of timber, shrubs, greens, vines, and flowers that may thrive underneath and round black walnut timber, you may confer with the detailed data supplied by PennState Extension.

Completely Juglone Illiberal Vegetation to Keep away from​

On the flip aspect, some crops, timber and shrubs ought to be prevented totally when planting close to Black Walnut timber, as they’re extremely delicate to Juglone. These embrace:

  • Chrysanthemum (Chrysanthemum spp.)
  • Tomato Vegetation (Solanum lycopersicum)
  • Rhododendron (Rhododendron spp.)
  • Mountain Laurels (Kalmia latifolia)
  • White Birch (Betula papyrifera)
  • Blackberries (Rubus fruticosus)
  • Hydrangeas (Hydrangea spp.)
  • Azaleas (Rhododendron spp.)
  • Blueberries (Vaccinium spp.)
  • Apples (Malus domestica)
  • Crocus (Crocus spp.)
  • Lilacs (Syringa spp.)

How Can You Inform If Your Vegetation Are Reacting Negatively To Black Walnut?​

Vegetation experiencing Juglone sensitivity exhibit wilted, yellowed leaves that that happen quickly. That is very true when the climate is sizzling and dry.

It’s simple to confuse drought stress with Juglone sensitivity, however simply do not forget that drought stress takes place slowly when the soil is dry. Juglone sensitivity manifests quickly, even when the soil is moist.

Black Walnut – Designing Round It​

5 Planting Ideas For Wholesome Gardening Round Black Walnut Timber​

Understand that when planting underneath or close to Black Walnut timber, selecting Juglone tolerant crops is only one step towards success.

It’s additionally important to think about components past Juglone, similar to soil, moisture, temperature, shade, and daylight. Listed below are some normal suggestions for profitable plantings:

  1. Create raised beds to cut back root contact, utilizing weed material and new topsoil.
  2. Forestall leaves, hulls, and stems from decomposing close to planting areas.
  3. Keep away from mulch containing walnut bark, wooden, hulls, and leaves.
  4. Enhance soil drainage with natural matter modification.
  5. Find gardens properly away from Black Walnut timber.

Keep in mind to decide on the fitting crops and observe the recommendation and suggestions offered right here to create a thriving backyard underneath the majestic cover of your Black Walnut timber.

And right here you may try our guides on caring for and rising walnut timber typically.

Some Ideas About Planting Below Black Walnut Timber​

Top Bottom