Can Terrain Placed objects play certain sounds?

I have certain plants that i designed, textured, and imported into the basic unity terrain engine. i then painted as i saw fit, and yadda yadda. The problem is that the prefabs of said plants have an audio source that works when placed, but not terrain painted. is there a scripting option for me to implement to fix this, and gain a sound from the terrain placed models? furthermore could i get the grass to sing? (trippy project)