Fungi breaking down allelopathic substances in Siberian Elm?

Hello,

I have some Siberian Elms, which I would prefer in a hugelkulture instead of as trees. However, it has allelopathic substances in it. If I added mushroom starter of some sort to the bed, would this neutralize the toxins?

Which mushrooms would work best? The beds will be built of mostly small diameter wood and twigs, since this is for a vegetable garden in a dry climate, and I don't want a huge mound. Manure will be added on top of the fresh wood, and the whole works will be covered with a few inches of soil, not more, because of an extremely rocky soil. Then the surface will be sheet mulched, to prevent erosion and to smother a lush growth of bindweed. Which mushrooms would work best in this environment, (either in the surface mulch or in the core.) I was thinking of oyster mushrooms.

Does anyone have direct experience with destroying allelopathic substances with fungi?

Should the starter be added to the wood core, or to the surface mulch?

If I added the mushrooms in the fall, could I plant in the spring?

Thanks

Fungi will break down allelopathic substances. However, as the disclaimers go, "your mileage may vary" "past performance is not indicative of future results" and "offer available for a limited time only". Seriously though, your questions don't have exact answers, and a little experimentation on your part may be necessary to determine the optimal mushroom species, watering conditions, manure to mulch ratio, etc.

This paper seems to suggest that the presence of Siberian elm in mulch is not a problem and gets broken down in a reasonable (3 month) time period. Oyster mushroom is an excellent choice as it is one of the white rot fungi that are better at decomposing allelopathic substances. The method I recommend for applying a fungal inoculate is to get an immersion blender and make some mushroom gazpacho in a big pail. Sprinkle it liberally all over the top of everything you want to infect and water it in good. Continue to water it daily until you get a good soaking rain. In a couple of months, you should be able to dig into the mulch a couple of inches and see lots and lots of white hyphae. Once you see hyphae, it's well conditioned for planting.

I'm rather surprised to read that Siberian Elm is considered allelopathic. Perhaps it isn't as strong as something like Black Walnut?

In any case, I have happily utilized chipped up Siberian Elm in my gardens without issue. I have had happy flushes of King Stropharia where I have laid down the mulch.

One of my 'tricks' when I have mulches that come from allelopathic or oil/resin filled wood materials is to leave it in a heap for a period of time until white/brown rot can colonize and start breaking down the chips. Once I dig in and there is heat/steam, it is generally ready to be dispersed. This first wave of fungi tends to make the material easier consumed for successive future fungi.

https://ask.extension.org/kb/faq.php?id=136009#:~:text=Expert%20Response,Thanks%20for%20asking!

So this is interesting. Apparently Siberian elms are not that allelopathic according to this person. Chinese elms are allelopathic and people get Siberian and Chinese elms mixed up all the time. Now that being said, I'd love to know this person's source material. I have seen monocultures of Siberian elms around my area.

I believe there are a lot of misconceptions when it comes to allelopathic substances whether they are Siberian Elm, Cedar or what ever.

I mention cedar because it is considered a allelopathic yet I have see fungi growing from the roots.

These biochemicals are known as allelochemicals and can have beneficial (positive allelopathy) or detrimental (negative allelopathy) effects on the target organisms and the community

https://en.wikipedia.org/wiki/Allelopathy