Tree and other vegetation have white outline

When ever i put my game to night time the trees and other plants have whitish outline.

I saw a way to fix this but it wasn’t detailed enough for me to understand i don’t know how can someone explain this in detail how to fix this problem im still new to unity and shades. The tree types i used were alder and scot pine trees all free from the asset store

Heres Pic:

Try fiddling with the terrain inspector 5th and 6th tab for your added foliage colour settings.