Capsule Colliders not working with mass place tree's and brushes?

I am making a 3D open world map. I went into my tree’s prefab and gave it a capsule collider so I wouldn’t have to walk through them… But it only works if I manually place the tree’s from the projects tab. for whatever reason it will not work with mass place trees or brushes. it places the trees but there is no collision with the first person controller. Please help, i’m not trying to have 15,000 items in my Hierarchy asI doubt it would help performance wise. Thanks in advance for any guidence on this matter. I’m new

Nevermind, finally got it working myself.