get the very expensive applicator at the link ...

and get 100% undiluted roundup [which is actually 41%] or stumpkiller ..

clean out applicator... fill with killer.. and apply to the cambian layer.. which was the green layer just inside the bark ... no need to treat all the deadwood in the center ... we are talking PRECISE application of most likely.. a tablespoon or so ....

this should have been done immediately at cutting ... but being winter .... will probably still work fine ...

return unused killer to bottle it came in .. clean out applicator ... mark with XXX and store in garage for next time ...

if at any time.. new sprouts emerge.. snip with pruners.. and put one drip on the sprout ... continue until stump and roots die ... which is when they stop sprouting ...

this will not do anything like locust ...

if you want to plant near the stump ... dig hole.. remove soil.. throw it behind garage ... and refill hole with fresh NATIVE soil from behind garage ...

i would predict.. how close you can plant to the stump.. is going to be more about finding where you can dig a good sized hole.. with mature roots under the soil .. rather than worrying about and residual juglone ... so once you find a spot to dig a proper sized hole .. just throw in some fresh soil ...

the only other consideration.. is that rotting wood uses available water.. to cause the rot ... and over the next few years... you are going to have one spectacular mushroom show.. enjoy it .... but also insure that there is enough ambient water.. so the soil doesnt dry significantly due to the rotting ....

good luck

ken

Here is a link that might be useful: link

Thanks a million Ken! You were just the person I had in mind when asking this question. I should have just started the questions with, "Hey Ken."

I have the undiluted roundup but was bummed about the expensive applicator when I first started reading. I live about 45 minutes from any major store and I didn't want to have to drive or order one online, but if Ken said to get it then I was going to get it today. Then I clicked the link. LOL. Thanks for the laugh and great advise. Can't wait for the mushroom show. Yours were beautiful. Just watch out for those stink horns. Those things are phallic and stinky.

brand is not important.. its the form of the applicator.. total control of flow rate ...

think dollar store ....

i just emptied my latest on hot dogs.. and now have 3 spare applicators..

i will send it to you for 59.95 .. but wait.. if you order in the next 10 minutes ... i will double the order.. for only an additional 23 dollars in handling charges ...

plus shipping of 9.99 of course ...

lol

ken

Why not just call up your local stump grinder guy and be done with it.

No chemicals, no waiting around for it to decompose and its gone in a 1/2 hour.

Dave

There'll still be roots aplenty even if stump is ground out. I think that is a significant part of what Garen was asking about. As far as how long the roots and their exudates remain toxic (To plants), that is a very good question. I'd have to research that to make an intelligent answer. But Garen can do that!

I do believe that black walnut will not sprout from the roots, a ala honeylocust, black locust, most poplar family members, etc.

+oM

Tom said: "I do believe that black walnut will not sprout from the roots".

That is a correct statement. I have removed four large black walnuts over the years and I have never experienced new growth from left over roots. For that matter they are not surface rooters like Sweet Gum or Soft Maple. They tend to be deep rooters when no chance of sending up suckers for redevelopment.

Dave

in other words.. and correct me if i am wrong.. some trees have dormant buds above ground.. and all you must do is treat and kill the stump .. sometimes repeatedly ...

while other trees have dormant buds below ground also .. and can become problematic ...

not to mention that other trees are prolific seeders ...

or is that too simple and overly broad????

ken

Thanks everyone. I'm glad to know I won't see waves of little walnut trees sprouting up all the my yard. The black locusts I cut down were like something out of a horror movie

I know a guy with a stump grinder so I may try that out if the stump drives me crazy.

I have to admit I was lazy and didn't use Kens magical mustard bottle stump killer applicator. Yeah, I should have listened , you really need a precise applicator if you don't want to waste a bunch of roundup. Just hope the wife doesn't catch me squeezing a full bottle of mustard down the drain. =)

Found this on another forum - DG , dont know the writers credentials, I think that ken has an good approach, I planted my beds in raised mound , good luck - mike

The presence of juglone is highly concentrated immediately under the leaf canopy of black walnuts, both from the tree roots and the accumulation of dead and dying debris. Decaying roots from a dead black walnut tree can still contain juglone for many years. The leaves containing juglone may be composted where the juglone will break down in several weeks from the presence of bacteria, air and water. If you want to test the toxicity of composted walnut leaves, plant tomato seedlings in it. Tomatoes are highly sensitive to juglone and will quickly die in its presence

I don't disagree with any of the above information.

I can only address with what I know in dealing with these trees first hand

The neighbors back yard that backs up to mine is full of Black Walnut. The closest one now is 25 ft. from my property line with 4-5 remaining deeper into his property line. Two years ago I paid to have two removed 5 ft. from property line... stumps and all. There has never been any sign of rejuvenation from remaining roots.

I had them removed because of shade issues. In the 30 years I have lived here there was never any issues with juglone above or below the ground. All my plants thrived.

The only issues with these trees was the shade issue preventing my conifers from receiving adequate sun light. Now that that is resolved no other issues abound.

In my opinion the juglone issue from walnut trees is way over played to the extent it is a superfluous discussion material. Might as well be talking about how many times it has snowed in Scottsdale AZ.

By nature these are trash trees. Broken limbs because of to much walnut production. Ground clutter from fallen walnuts plus they defoliate early in the Fall trashing my yard with leaves, twigs and the like.

Black Walnut, Sweet Gum, Popular, Soft Maple, Silver Maple all dumpster bound at one time or another for me.

Garen, good luck on what ever you decide to do. Other then the stumps being a issue you want resolved don't loose sleep over the juglone.

Dave

I am glad you all had this discussion 9 years ago because I recently purchased a home with a black walnut tree growing in the raised flower bed right next to my house! Knowing how roots can damage foundations I immediately went to work digging it out. Then I learned about the toxic nature. I'm concerned for all my flowers. I don't know how far these roots go down as I cut it off from the main part sticking up and I'm still trying to dig down to get to the base. I hope it won't regrow or kill my flowers above it. I would like to plant in that area again but a couple of the roots are closer to the surface and I think I'll need to dig up all current flowers just to get it out. Not sure my best solution but after reading all this I'll keep digging for now! If I can get the yellow jackets to leave me alone. Got any advice there?

Rachel H.

Try starting your own post/thread and include some pictures of the area you want to diagnose. Most people don't see these old post and/or hate to scroll down the many responses.