Gibberellins induce stem elongation in "rosette” plants. Cabbage is a good example of such a plant in which leaf development is profuse, whereas intemodal growth is retarded. Just prior to the reproductive phase, the intemodes elongate enormously causing a marked increase in stem height. This is called bolting. Bolting requires either long days or cold nights. If a cabbage head is kept under warm nights, it retains its rosette habit. Bolting in cabbage can be induced artificially by the application of gibberellins under conditions that would normally maintain the rosette form.