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| I've heard walnut trees and roses don't do well together...but how close do the walnut trees have to be, to cause a problem? Is it 50', 100', 200' or 20'? Thanks in advance :)
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Follow-Up Postings:
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- Posted by nikthegreek 9b/10a E of Athens (My Page) on Tue, Jan 28, 14 at 14:42
| I don't think that walnut trees go together with most other plants, due to walnut tree's allelopathic properties, although there are some tolerant ones. I would not plant a rose within its root zone, a radius more than the height of the mature tree to be on the safe side. Nik |
This post was edited by nikthegreek on Tue, Jan 28, 14 at 14:44
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- Posted by lavender_lass WA zone 4 (My Page) on Tue, Jan 28, 14 at 15:41
| Thank you. They're on property, not a yard, so they aren't that close, but I was wondering what would be safe. |
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| It's deadly for any roses with china or tea ancestry. With others, it's hit or miss. I've got rosa mulliganii happily hanging from a black walnut and Chevy Chase only a few feet away. But I also once tried Commandant Beaupaire just outside the canopy of the tree only to see it die a lingering death. While the walnut roots are the real killers with the most concentration of juglone, it is lingers a while in the leaves to a lesser extent, so you would want to make sure you don't let them accumulate around plants or land in pots. Once they've composted they are fine of course. |
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- Posted by jeannie2009 PNW 7/8 (My Page) on Tue, Jan 28, 14 at 17:55
| Hi Lavender, its good to see you posting. I cant remember if its black or English walnut; but one of them should not be planted near horses. Hope spring comes early for all of us. |
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| I believe it's the Black Walnut that has poisonous roots. As long as the roses are planted out of the root zone they should be OK I think. My cousin has two Balck Walnuts in her front yard and has a very hard time getting anything else to grow there. However, she has a lot of roses in her back yard and they do fine. |
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- Posted by nikthegreek 9b/10a E of Athens (My Page) on Wed, Jan 29, 14 at 0:23
| The document linked to below provides a list of plants supposedly tolerant. Nik |
Here is a link that might be useful: Black walnut allelopathy
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| Lavender, The English walnut/Black walnut distinction would disappear if the English walnut is grafted onto Black walnut rootstock, right? I have seen trees grafted precisely like this. Larry |
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- Posted by nikthegreek 9b/10a E of Athens (My Page) on Wed, Jan 29, 14 at 14:27
| I'm not sure which walnut is common here in Greece but they sure exhibit these allelopathic properties. I suspect that many of the cultivated ones are of Californian origin, which would make them Junglans nigra (black walnut) cultivars I suppose. Nik |
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- Posted by jacqueline3 9CA (My Page) on Wed, Jan 29, 14 at 15:12
| Our street trees are black walnuts which are over 100 years old (I have old family pictures from 1905 which show a couple of them as newly planted babies). One of them had to be taken out a few years ago, because it had destroyed the sidewalk. The city arborist was there that day, and called me to come look at the excavation - some of the main roots were 12 inches in diameter! They were heading right into my garden. Each year we had had a large crop of black walnuts falling in the rose beds. Nonetheless, the roses were growing happily about 15-20 feet away from the trunks, even though the walnuts either fell near them, or were buried near them by squirrels. I am sure that the "root zone" of these huge old trees was much larger than that. So, that is my only practical experience, which completely contradicts some of the info stated above. The roses which were growing there were all tea roses or polyanthas, which had been growing there happily for decades. Jackie |
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- Posted by jeannie2009 PNW 7/8 (My Page) on Wed, Jan 29, 14 at 21:59
| The reason for my post, Lavender and I have horses. One of the walnut trees kills horses. I don't know which so I don't grow either. Just hoping to warn Lavender as horses are so special. Jeannie PS by the way...last spring I planted "Lavender Lassy", just thought you would want to know. Jeannie |
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- Posted by floridarosez9 (My Page) on Thu, Jan 30, 14 at 10:42
| Jeannie, it's black walnut. |
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- Posted by lavender_lass WA zone 4 (My Page) on Thu, Jan 30, 14 at 12:54
| Jeannie- Thank you! I remember reading that now, when I was researching poisonous plants years back (first designing my garden). I wanted to avoid anything really bad for horses, cats or dogs. It says that the wood is bad for horses, when it's absorbed through their hooves...so not to use it for bedding. Falling walnuts can also be a problem, so no black walnut trees near the horses! I guess other walnuts can be grafted onto black walnut, so the roots can still be a problem for plants, too. Oh, those are supposed to have a nice fragrance! They're a little too cold sensitive for my area, but if we move closer to town...I do like the name! :) Jackie- Good to see your roses haven't suffered at all. I know every situation seems to be different...maybe it's the type of soil or how old the trees are, but I'm glad your roses are doing so well! Nik- Thank you for the link! Rinaldo- It always amazes me how different roses can be, depending on what type they are. It seems like the more I read about them, the more I realize I still don't know! I wonder if raised beds would help with vegetables? Seil- I read that lilacs and many other shrubs will do well with black walnuts...and it's a large yard with some property. The walnuts probably wouldn't be a problem, unless they're too close to the horses. Larry- I did see that and you're right...since the roots are the problem with the plants, it wouldn't make any difference if grafted onto a black walnut. Florida- Do you have any in your area?
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- Posted by floridarosez9 (My Page) on Thu, Jan 30, 14 at 23:08
| No, we don't have them, but I'm always careful when I order bedding for the stalls. I make sure it's local and doesn't have any black walnut in it. |
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- Posted by lavender_lass WA zone 4 (My Page) on Fri, Jan 31, 14 at 16:21
| You would think people would have more sense! It reminds me of the 'chocolate' mulch that some gardeners had around dogs :( |
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