Not just any plant can go in a window box. You've heard about the thrillers, fillers, and spillers (something that grows high, something bushy in the middle, and something that drapes out and over). We're here to take the guessing game out of the process. Pick 3 or 4 of whatever spins your wheels, or pick our Sunny Window Box Kit with 12 plants - enough to fill up to 4 window boxes.