I think you don`t understand the problem. Sorry for my bad english, try to explain:

If you have a flower, the flower is round. But the Texture for the flower is a Rectangle. So in the texture should the flower have a alpha = 255 and all outside the round flower should have a alpha = 0, have to be invisible. But it isn`t, all is visible in my projekt...

So the flowers shows up as a lot of rectangle...