Board Thread:General Discussion/@comment-26581304-20150929051849/@comment-7326455-20151008101610

You can make decorations with them long before you reach level 16. As in, using the Workshop.

But yeah, I'm loathe to either use them OR trash them, because they're essentially irreplaceable. I have no idea whether the seedlings or the decorations are eventually going to serve some purpose or not.