Hydrangeas plants have become trendy and stylish for modern landscaping, partly because of new varieties developed for colder northern climates and a wider selection of blossom colors. When choosing a hydrangea bush for your backyard, select a hydrangea variety that is suited for your zone. Hydrangeas has several colors. One example is purple hydrangea backyard plants. To grow purple hydrangea backyard plants you’ll need to select an appropriate variety, as hydrangeas can range in color from crisp white to blazing red. You’ll also need to monitor the soil’s aluminum content, which can drastically affect flower color: Too much aluminum, and you get blue flowers; with too little, you get pink.