I wouldn't use the pine cones either, unless you completely break them up.
I think one of the coolest things is burying logs horizontally (hugelkultur) or smaller branches vertically, especially those that decay fast. The vertical branches provide routes for water, air, earthworms, and everything else to travel up and down within the soil. It can take a lot of work though. Which is which prefer for these routes to just grow in place, so I don't have to dig (ie, clay-busting cover crops).
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