A sunny window is ideal for light-loving plants, but because the light comes from only one direction, plants often lean toward it. To provide more balanced illumination, create a simple sun box. Cut off the top and one side of a cardboard box, then line the remaining interior surfaces—the bottom and the three sides—with aluminum foil, shiny side facing out. Secure the foil with tape or glue. Place your plants inside the box and position it near the window to reflect light onto all sides of the plants.