Clay soil in a raised bed--how to fix the problem
A decade ago my brown-thumb father constructed nice raised bed out of timbers. The bed is 2 1/2 feet tall, about 40 feet long and eight feet deep. Then he had someone deliver a truckload of "topsoil."
When I went out to help him in his garden I was horrified to find not topsoil but some of the worst clay I have ever experienced in Midwest gardening. The stuff is rocklike when dry, dense and unworkable when wet, and let us not even talk about the drainage.
How to fix this situation now? Since the stuff doesn't reduce in volume through decomposition, I think the only thing to do would be to take out up to 6 inches of the stuff and then do lasagna composting?
My father is 70--if there is a way to fix it without digging out some of the clay, I would be happy, but am not sure any other way exists in a raised bed.