alpha tree

well, I know that you can make good looking trees with just two planes with alpha textures, however, I can’t figure out how to do this. I have 2 textures to the plane, one for color and one for the alpha image. everything I’ve tried has failed when it comes to rendering. I have this program called paint.NET and there you can paint right on the alpha channel, however, it turns out black when it’s in blender. so, does anyone know what I should do?

Actually, yesterday I was trying to do the same thing. I didn’t get very far, but this might help

thanks! I got it!