Juglone Susceptible Plants forum: Juglone Susceptible Plants

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Imagestormyla
Feb 8, 2010 6:58 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Please post here links to any websites with lists of juglone Susceptible Plants.

Also feel free to post the names of plants that from your own experience suffer adverse effects from exposure to Juglone.
Please keep in mind that many other contributing factors could have hurt your plants, before deciding to include that plant here.

Also please feel free to discuss what symptoms your plants exhibited.
ImageTicker
Feb 24, 2010 4:50 PM CST
Name: Diann
Iowa
Tomatoes and those in the tomato family are susceptible. But you probably already know that. :)
Imagestormyla
Feb 24, 2010 5:56 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Actually, Diane, I grow all of my tomatoes in giant pots, so I didn't know that!! Big Grin

Thanks to you, now I and all of the other readers do too! Thank you
Imagestormyla
Aug 22, 2010 11:09 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Juglone seems to adversely affect Mountain Laurel, Kalmia.
Imagestormyla
Aug 24, 2010 2:54 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
I have read in several articles that Juglone kills the Mycorrhizza and therefore makes plants unable to draw food and minerals in from the soil.

This makes me wonder if the addition of Mycorrhizza to the soil annually might not be a good idea for any plants living beneath the Black Walnuts.
Imagestormyla
Aug 26, 2010 12:04 AM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together

I have read that many conifers including Spruce are susceptible to Juglone's toxicity. However, I have an 80' tall Norway Spruce within a Black Walnut's drip line and it shows no signs of distress.
Imagestormyla
Aug 28, 2010 2:30 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
An article that I read said that if both Black Walnuts and conifers are planted near each other as similar sized seedlings they should be fine. It cited specific nurseries that grow Black Walnut for logging purposes, planting conifers between the rows as a form of weed control
Imagestormyla
Aug 29, 2010 10:39 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
I read a very long article from the Virginia Cooperative Extension concerning establishing grape vineyards. They say Juglone is very toxic to grapes and not to plant any grapes within a distance of an area equal to twice the height of the tree.

http://pubs.ext.vt.edu/463/463-020/463-020.html
Imagestormyla
Sep 3, 2010 3:00 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Yesterday I read a long article about walnut trees in general. The article said that most walnuts that are found in supermarkets are from the Persian Walnut trees. Persian Walnut trees are not known to be allelopathic. However a good many growers graph Persian Walnut cuttings onto Black Walnut rootstocks. These grafted trees will produce juglone and will have allelopathic properties.
Imagestormyla
Sep 13, 2010 12:18 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
I have read several articles that say that if you create raised beds you should be able to garden under Black Walnut with no problem. The articles all say that composting and the incorporation of organic matter into the soil should negate the effects of the juglone as the microbes digest it.
ImageCeeDub
Jul 13, 2011 7:32 PM CST
Name: Christine Wootton
Whitby, Ontario, Canada
I have two giant trees in my backyard that are nearly twice the height of my two storey house. The woman who lived here before me (for 49 years) figured it out, but thought it was because of acidic soil.

What won't grow for me:

Most clematises, although if they are fed dolomitic lime in the fall and early spring, they have more of a fighting chance.

Lilacs - won't outright kill them, but sure does a number on their growth and flower production; I was able to save a dwarf lilac by moving it to the front of the house before it got too far gone.

Vegetables we have tried: tomatoes, strawberries, bell peppers, hot peppers - they all just wilt and die. We grew a few hot peppers in a container this year. I like the idea of the upsidedown tomato pots that you hang from a hook or tree.

Bleeding heart - poor thing started out as a nice bush three years ago, this year it had one single stem, and about 5 or 6 flowers, it was completely gone before the end of June.

Toad lilies, ferns, a few other lilies, but the yellow, boring ones are okay and most day lillies grow just fine.

Its hard to remember all the perennials that I've planted since we've been here that didn't come up at all the next year - out of sight out of mind is my motto. As I remember more I'll come back here and post some more.

Great subject Stormy!
Christine
Imagestormyla
Jul 13, 2011 8:19 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Thanks Christine! Big Grin It's great for people to post here what works or doesn't for them. I've had mixed results with ferns. Some varieties grow, others don't. I don't have any Bleeding Heart directly under the Black Walnut, but have quite a few of the "Alba" well within their drip line. They grew so well that I had to divide them all after two years.

The Astilbe seem to do well under the Black Walnut as well as Iris of all forms. Hosta and Heuchera do fine and so do Daylilies, Hardy Geraniums and in my experience, all Hydrangea and most types of Lilies.

You are right about the vegetables. Most of them won't tolerate Juglone at all. I also find Roses to be Juglone tolerant.

Christine, I have one Lilac under my black Walnut that doesn't bloom. I thought that it was because of the shade. Maybe I will move it. Thanks for that tip! Thumbs up
ImageCeeDub
Jul 13, 2011 9:10 PM CST
Name: Christine Wootton
Whitby, Ontario, Canada
Yes, hosta grows well here; I'm slowly filling in a lot the blank spots with them.

This means I can move my new little heuschera to the backyard - yay, I'm running out of room at the front (no bad trees there).

Also bellflowers, grow well, and I have a rose of sharon that's a blooming showoff within 25 feet of one of the trees, and is completely under the canopy.

I never thought I could hate a plant, but euonymous grow fabulously here - the entire bottom of my back yard, from fence to fence and about 8 feet into the yard, is covered with it, and one tree sits right in the middle of it; the other tree's not that far away either, so its under the canopy of both trees! We call it the graveyard ... a few dead squirrels we found and also a bat that got into the house are interred in there.

Oh, a rhubarb patch is planted very close to the trees, but it produces very skinny rhubarbs.

Cone flowers and phlox are okay too. Wish I could see the gardens, but right now its dark and bedtime.

More to come, I'm sure.

Christine
Imagestormyla
Jul 13, 2011 10:12 PM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Thank You Christine! Helianthus and Heliopsis as well as Ligularias do very well under the Black Walnut too. I 've also had luck with multiple types of Campanula too.

Azaleas do well for me within the black walnut's drip line even though they are not reported too. I also have several types of Ninebark growing there too.

Imagestormyla
Jul 14, 2011 5:27 AM CST
Name: Stormy
Valley Forge Pa
I Love MAM ~ So Happy Together
Hilarious! Christine, I realized late last night that I mixed up my own threads and put Juglone Tolerant plants on this Juglone Susceptible thread!! *Blush* Oh well, I don't want to move the posts because it will break the flow of the conversation, so I'll try to do better in the future. Smiling

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If you garden under Walnut trees, this is the place for you. Come see which plants will survive the Juglone and get ideas of what to do with all of those walnuts!

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