Some of the most popular Hydrangeas are the Mophead varieties (Hydrangea macrophylla) which produce huge ball-shaped flowers. This species was originally cultivated in China and Japan. Many varieties tolerate wind and salt spray. Fortunately for gardeners in colder zones, recent Mophead introductions are more likely to flower on new growth as well as year-old stems, which means flowers are guaranteed even after a tough winter.
Some varieties change flower color depending on the pH of the soil, generally blue on acid soils and pink on alkaline. You can change the color of your blooms by using one of the soil additives available here.