I've used black locust ash for many years in my garden which thrives! In fact, I had a problem with my broccoli and brussels forming leaves but few heads and after trying many different soil amendments found that wood ash (incinerated at high heat) solved the problem. I have gorgeous heads now and the largely black locust wood ash was the only variable which changed  . It's a GREAT wood btw, for flooring, siding and beams, just saying. It's had a bad rap.

I've used black locust ash for many years in my garden which thrives! In fact, I had a problem with my broccoli and brussels forming leaves but few heads, and after trying many different soil amendments found that wood ash (incinerated at high heat) solved the problem. I have gorgeous heads now and the largely black locust wood ash was the only variable which changed. It's a great wood for flooring, siding and beams, just saying. It's had a bad rap.