So.. I have a question re conifer trees that I need some advice with.. I had a tree cut down a week or two ago and I'm in the process of building a raised bed approx 4m long x 1.2m wide x 1m high. My question is, can I put the logs in the bottom, then the brash on top of the logs to half way before adding well rotted manure & top soil to the top half. I'm just wondering how it might affect the top soil?