I looked into this, and while making those changes I mentioned I also added support for imported plants to be nest within plants. But honestly it seems like something that will cause more trouble than it's worth (I mean trouble for me or any future Cabbage developers!). It's just about Ok for imported plants, but for normal plants I don't see the point. I really don't like the look of this:
image bounds(0, 0, 300, 300)
image bounds(10, 10, 200, 200)
image bounds(10, 10, 100, 100)
label bounds(5,5,100,15), text("Hell no!")
label bounds(5,45,100,15), text("This is madness!!")
label bounds(5,45,100,15), text("Did I fall asleep and wake up in lisp!!")
I'll push the nested imported plant mechanism a little further and see what kinds of pain and anguish I can cause myself! If you don't here from in a while it'll be because I'll be rocking myself against a wall in the corner of my studio repeating the phrase 'all plants and no play make Rory go something something'...