Thanks. I don't have any walnut. I have some
honey locust, some well rotted plum, small amounts of ash, conifers, and maple and what feels like a metric ton of huge cottonwood logs. Generally I burn the larger pieces of wood during the winter, but have
enough to do a hugel bed as well.
I read in Carrots Love Tomatoes that the nutrients in wood are left behind in the ash, but I also understand that wood ash is generally added to soil in small amounts due to its ability to increase ph levels. But what if it's buried deep in a hugel bed?
Another question, too: what about redwood? I have some chunks left over from a construction
project.
Take care!
Owen