Is ther a way in blender to make a 2d plant then put it in blender but make the white part transparent and the plant show up in the game?
your image needs an alpha channel
blender will not create it for you
you can create it with the wand tool [to select the white] and then deleting that in most image applications [you may need to give the image an alpha channel first]
You have to use a texture format with an alpha channel, such as TGA or PNG. There’s plenty of tutorials for setting these up floating around on the web if you search…
I think there’s a way to render an alpha texture from the Blender renderer, but I can’t remember exactly how that works.
You can get some good effects, such as the surface of water by using textures in ADD mode too.