Objects in Scene can't become dark

If you look at the picture the flash light is not shining on the tree’s but they light up?
The Trees are from the “Terrain Assets” published by Unity Technologies.

Is there a easy way to fix this or would i have to deal with it. Do i need the pro to fix this or a script. I am trying to make my first game look as good as it can but this is bugging me.

Assuming you have Diffuse shaders on your objects, this is likely because your Ambient Light isn’t set to black. You can find this in Edit-> Render Settings.