Juglone Resistant Shrubs
Juglone resistant shrubs
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)
What plants are not affected by black walnut?
Some shrubs like lilac, hydrangea, rhododendron, viburnum, and yew are also considered somewhat sensitive to juglone. There are many other plants, however, that are not impacted by juglone. Shade-loving perennials like bugleweed and bleeding heart can coexist nicely underneath walnuts without any injury.
Are hydrangeas tolerant of juglone?
Juglone is a natural toxin produced by black walnuts to eliminate competition from other plants. You shouldn't plant flowers and vegetables under a black walnut tree, such as asparagus, rhubarb, peppers, tomatoes, eggplant, potatoes, hydrangea, peonies, lilacs, blueberries, azalea, and true lilies.
What evergreens will grow under black walnut trees?
Tolerant Evergreens
- Chinese juniper. Juniperus chinensis.
- Common juniper. Juniperus communis.
- Eastern red cedar. Juniperus virginiana.
- Arborvitae. Thuja sp.
- Eastern Hemlock. Tsuga canadensis.
Can I plant a hydrangea near 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.
Do boxwoods tolerate juglone?
As boxwood have a very dense matt of roots, if their planting holes are dug extra deep and wide and all tree roots are cut out and then they are filled with some good old store bought garden soil, there is a good chance the boxwood will be fine for a long time even if they are indeed bothered by juglone.
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 can I plant under a black walnut?
8 Plants to Grow Under Black Walnut Trees
- Honeysuckle. (Lonicera species)
- 2. Japanese Maple. (Acer palmatum) ...
- Rocky Mountain Columbine. (Aquilegia coerulea) ...
- Sweet woodruff. (Galium odoratum) ...
- Spice Bush. (Lindera benzoin) ...
- Forsythia. (Forsythia species) ...
- Coral Bells, also known as Heuchera. (Heuchera species) ...
- Hosta. (Hosta species)
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.
Are roses juglone tolerant?
The tree fends them off with a chemical called juglone that it produces to defend its roots from competition. 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.
Are marigolds sensitive to juglone?
Pansies, pot marigold (Calendula), and zinnias are a few of the annuals that seem to tolerate the juglone. Unfortunately there is not a complete list of all plants and their susceptibility or resistance to this substance.
Is Magnolia juglone tolerant?
“Just wanted to share one small experience in tree husbandry. I've seen Magnolia listed as one of the plants sensitive to juglone from Black Walnuts.
Do ferns tolerate black walnut trees?
If you are faced with planting under or around black walnuts or hickories, consider the following herbaceous plants: Ferns – Ferns in general appear to be a safe bet when planting under Black Walnuts and Hickories. Ferns make nearly all of the lists of juglone tolerant plant species.
Will boxwood grow under black walnut?
Some reported success planting boxwood under black walnuts. Others report that boxwood are sensitive.
How long does juglone stay in 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.
Do azaleas tolerate juglone?
Vegetables such as tomato, potato, eggplant and pepper, and ornamentals such as lilac, peony, rhododendron and azalea are particularly sensitive to juglone.
How far away should you plant from a black walnut tree?
Space your black walnut trees 40' to 80' apart, and English walnuts 20' to 40' apart. NOTE: Plant black walnut trees 50' from fruit trees. The root of a black walnut trees are toxic to many plants.
Can I plant a Japanese maple near a black walnut tree?
Japanese maple is a good walnut tree companion plant and is most notable for its spectacular display of red or purple fall foliage.
Are camellias sensitive to juglone?
All parts of the tree — roots, bark, leaves, nuts, and even rainwater that falls off a leaf — release an allelopathic substance called juglone. Pecan is also a well-known offender, especially near azaleas and camellias.
Can cherry trees tolerate juglone?
Fruit trees that can thrive despite juglone include cherry, plum, peach, and nectarine. Shrubs such as quince and black raspberry will also do well.
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