I suggest this plugin for the survival mode, it replants tree saplings and plants at an adjustable probability automatically again when the item (the sapling or plant...) would actually despawn. I saw the plugin on a friend's server and we played with it for many hours. I think it improves the survival mode and also makes it a bit more realistic.
The Plugin: www.spigotmc.org/resources/realistic-growth.121462
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The Plugin: www.spigotmc.org/resources/realistic-growth.121462
React with a tick or a thumbs up/down to vote