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Bob, I think of compost as a soil amendment. As Dave is saying, the soil should be alive, with the living compost.. I see compost used as mulch here, too. Having some good pictures of what the final chip mulch product is like can help. Portland surely has keeping up with the strait-laced Jones'...

Some people think that they need to "freshed up" the mulch year after year. A little raking will fluff, and make more uniform, once again.

Evan, you touch on a good point about mulches and porosity. Screened mulch seems to compact/ mat too much by comparison to variable sized, larger, coarser chips. My experience is with CnD chips as mulch, largely. My guess is that it might resist compaction better than screened mulch. Thoughts?

ps. keep the irrigation from spraying the trunks. My guideline for people is the rule of a hand's width. About a hand's with deep in mulch (3-4"), and a hand's width of bare soil around the trunk to discourage growth of potential stem-girdling roots.

trenching bad, the rest, okay.