enter image description here

As you can see it shows up just fine in material mode, so that must mean my node set-up is right.

I also noticed that the the tree and bushes don't have this problem.

Is it a shadow issue?

blend file

(It may not have packed correctly)

  • $\begingroup$ Looks like you need to increase the number of transparent bounces. See blender.stackexchange.com/q/42023/599 $\endgroup$
    – gandalf3
    Dec 7 '15 at 20:23
  • $\begingroup$ YAY THANKS! can't believe this didn't cross my mind orz $\endgroup$ Dec 7 '15 at 20:51