trees created using tree creator visible only from very near!

hey i imported free the terrain assets from the asset store and added the trees in it to the place trees tab.then i selected the tree and placed it setting mass place values as 1 and bend factor as 1 .but the trees did not show up on the terrain.however whe i xzoomed the camera onto them then the tree was visible but not until the camera was inside it.it still reacts to the windzone.however when i zoom out the camera the tree disappears!please help!