These baby black cherries are growing in a crevice on a huge hurricane downed oak on here at Pure Florida. The fallen section of the oak is a horizontal trap for defecated cherry and palm pits that the birds deposit as they flit about it's dead branches. The tree has been decomposing since the amazing 2004 hurricane season and the niche in the trunk has enough detritus in it to support, temporarily, these treelings.
In the photo above, a cabbage palmling is also growing among the cherries. See the spike? The reason this is only a temporary nursery is the horizontal trunk sits a few feet off the ground, supported by a few huge branches. All it will take is a brief dryspell in the heat of the approaching summer and these little guys will be toast as the thin layer of decomposed tree dries out. I think if I'm real gentle, I can work these babies out of the crevice and replant them. Surely, it's worth a try.