Planting lavender under black walnut trees

idahogardensApril 21, 2009

I am picking up some beautiful 8yr old provence and grosso lavender plants this weekend. I want to plant them around the drip line of our black walnut trees. Does anyone know if lavender can survive the juglone? I cannot find it on any tolerant or non tolerant lists. Any advice/wisdom would be much appreciated! I don't want to lose them.. They're spendy!

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flora_uk(SW UK 8/9)

I don't know about the juglone but I would have thought lavender would not be happy under any kind of tree. It needs full sun. With too little light it becomes leggy and will be less floriferous. Also, I don't want to be a killjoy but 8 years old is pretty geriatric for lavender and already nearing the end of its healthy life. They must also be enormous and difficult to transplant. Have you used plants this old before with success? I really think you'd be better off with younger plants.

    Bookmark   April 21, 2009 at 4:17PM
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ksrogers(EasternMass Z6)

Black walnut can create a toxic area of soil beneath the trees. Its not advisable to plant anything that would even be outside the drip line of black walnut trees. Suggest that you choose a low shrub ground cover that does best in mostly shade, like Periwinkle (Vinca).

    Bookmark   April 21, 2009 at 5:46PM
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cyrus_gardner(8)

Not being specific about lavender, as mentioned by posters BW is kind of toxic to certain plants. This tixicity is due to an oil that exist in BW, which works like weed killewr. Even the tree's own seed will not thrive near it.
Most damaging effect comes from the roots of BW, making the soil intolerable to certain plants. I know for fact that tomatos, potatoes will not thrive if planted in the soil contaminated by BW's leaves, roots and wash out from its branchs. My tomato plants did not survive last year. But I had planted potatoes in containers(with soil from somewher else) did survive. Of course, there are a lot of plants that are immune to the oil in BW.I had a good crop of sesame leaves at the same area that tomatoes died.

    Bookmark   April 22, 2009 at 10:51PM
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dral

I have neighbors with 4 huge BW trees and nothing grows under them. Lavender does like full sun.

Could you start cuttings from the old plants and have new plants?

Has anyone thought of making a weed killer from BW nut shells? Wonder if it'd kill poison ivy.

    Bookmark   April 23, 2009 at 2:07AM
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fatamorgana2121(Zone 5/6)

An herbalist friend grows hostas under her black walnuts. She says her hostas thrive. But lavender? Nah, they like more sun than they would get under a walnut tree.

FataMorgana

    Bookmark   April 24, 2009 at 6:32PM
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cyrus_gardner(8)

It is not just the shade of BW tree, There is more.
BW tree releases a chemical, which I think is called Joglanole. This chemical exists in all part of the tree from root, to bark, and leave.
Additionally, the root line might be even bigger than its canapy.
I have read an illinois univrsity study about this, which has listed plants that are compatible and others that cannot thrive. Over the years, BW would contaminate the soil to the extent that you cannot change it. And there is no chemical to nullify that joglanole. Last year I planted tomato in a soils brough from another location. Tomato plants weredoing fine. But when thir roots reached the existing soil, they wilted and died'
But there are a lot of things that are gowing just fine under BW tree, Automn olive, hawthorn, creeping myrtle (vinca?), something from hosta family, honeysucle,..But maple, pine, BW own seeding will not survive.

    Bookmark   April 25, 2009 at 3:53AM
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