Ugly black on 2D leaves

Hi guyz,

I’m currently working on an important project for school and I imported a package yesterday (Winter Nature Pack). I was designing some level but when I placed trees I realised that there where ugly black around the leaves.
The black is shown in the Editor and in the game view…

I’m using Unity 5 and the package is from Unity 4… I tried with other packages and it’s the same…

Im just starting unity but with my experiences with 3D and texturing it seems you don’t have alpha enabled(if that’s a thing with unity). There is most likely a setting where you set the texture to enable alpha.