Every plant has sun and shade requirements. Before you go shopping, take a tour of your yard at various times of day to get a sense of how much light different areas receive. Pay particular attention to those spots for which you'd like to buy plants. When selecting plants, read the tags and choose only shade-loving varieties for wooded areas and sun-loving varieties for patches that get full sun. Many plants can tolerate partially sunny or shady conditions, so pick up part-sun or part-shade plants for spots that get a bit of both.