Black walnut has juglone in it, which can be harmful to other plants. I've read claims that you shouldn't use black walnut for wood ash in your garden because of this, although I'm not sure if that's true. It does seem pretty sure that soil black walnut is grown in is harmful, but it seems like burning the wood might change the chemical. Anyway, I don't know if it does, but that's not my question (it's a preface to my question):
I've heard that black locust (I don't mean black walnut) has allelochemicals of some sort in it that may hamper other plants (probably not juglone). I'd like to use wood ash that contains a small percentage of black locust ash on ground for tomatoes. Maybe one in ten pieces of wood burned was black locust. Is this ash going to be okay for tomatoes and other Solanaceae plants, or will it hurt them significantly?
If you have experience with black locust wood ash on plants like tomatoes, that would be preferable. I guess I could germinate some tomatoes and add some of the ash to the soil to see what happens.
I've heard people use black locust for nitrogen fixing. So, it doesn't seem like it would be that harmful to other plants. But, maybe they just use it for tolerant plants.
Squash are said to be tolerant to juglone. I'm not sure what tolerates whatever allelochemical(s) black locust uses, whether it persists in soil for years like juglone, or what. I'm not sure how potent it is, or if it's even in the black locust wood. I don't know it if affects plants at all (maybe it just affects animals). Black locust does have toxic parts to animals.