Like its namesake, Gregor Mendel, you cross-breed flowers, herbs, trees, and any other growing leafy weirdness for no other reason than to play god with an innocent planet's ecosystem.

Cross-pollination is not an issue. Try Imazaquin (Image Kills Nutsedge) or glyphosate (Killzall, Eraser Grass and Weed Killer, Roundup) for weeds in Asian jasmine.