Out Of Memory With Mesh Generation

Hello.

I've been having a problem with a terrain generation script recently. Basically, it creates a mesh for the terrain based off of as heightmap, then it creates a collider for the generated mesh (Much smaller than the terrain itself) so that it has collision. My problem is that after 20 or so terrain updates, Unity runs out of memory. It mentions the RecalculateNormals() function, and things about vertex data in the error window. How would I free the memory of the mesh, since that seems to be what's causing it?

Thanks in advance.