Thank you kindly! This is the mod i'm apparently using, but it was overwritten by some other mods or i just forgot to install that part with gildergreen tree add-on, so this amazing tree disappeared some time ago, and i got leafless tree much close to the original version instead since that. But I like this bushy living version much more, i admit.
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Skyrim 3D Trees and Plants
I've found this one in Nexus gallery, uploaded by mathy79.