So, what if there was a mechanism to reforest an area that you've logged? I saw someone wanted an easy way to remove the stumps, so maybe this could be done at the same time. You assign a new task: reforest, and they go out, removing stumps and planting trees. After some time, new mature trees are there again. Maybe you don't even need to picture them growing? Just as a sapling, and then as as the basic mature tree again, after a certain amount of time?