If you love the festive decor of holiday poinsettias and would like them to last much longer, remember these are desert plant, so do not overwater! Instead, use ice cubes. These will melt slowly to give your plants the nourishment they need as they need it. Use 4 cubes for a 6 1/2″ plant in a quart pot, 8 cubes for an 8″ pot, and 12 cubes for a 10″ pot.