NavMesh area blocked by terrain foliage

I'm working with a navmesh to generate path finding for my agents.

After adding some foliage to the terrain though certain types of foliage appear to block the pathing on the navmesh. See the image below. I've been trying to figure out how to make this area still pathable, or even better pathable but at a higher cost - but so far I seem to be at a dead end. I can't seem to find a setting for the foliage to make it navigation static, or turn it off altogether. Am I simply missing it somewhere? Thanks.

 

Try disabling the foilage while you bake the navmesh. Either that or find the mesh renderers and set them to navigation dynamic.