@bshag4lv...the leaves never go away if you don't take care of them. The mod just keeps them from turning stinky (the stinky ones you have probably were stinky before you installed the mod).
If it's spring, you should be able to burn all the leaves present and they won't return until autumn. There's another mod at that same site that lets you get rid of them quickly with 3 clicks rather than having to wait for the burn, if you want to clean them up more quickly than burning. I generally just leave all the piles (using the mod so they don't get stinky), year round..except for areas where I'm going to take screenshots.
And you're welcome, @fallenangel66. :)