I live in Portland, OR and I have a 100+ ft sequoia in my back yard. Keeping up with the falling needles/leaves is a year-round project. I've often wondered if they would make good compost. And yesterday there was a sever windstorm has blanketed my raised beds (and much of my yard) with a half-inch of sequoia needles. I'm considering just leaving the layer of needles at the base of my plants to act as a mulch. Does anyone have experience with this? Is this a good idea?