Hydrangeas need plenty of water to establish roots and to survive Southern summer temperatures. Learn how much water hydrangeas need to be healthy and the best watering practices. Southern Living: When And How To Water Hydrangeas So They Bloom Bigger And Better When And How To Water Hydrangeas So They Bloom Bigger And Better Netmums: Gardeners can turn hydrangeas bright blue again by summer with this everyday kitchen ingredient in the soil now Gardeners can turn hydrangeas bright blue again by summer with this everyday kitchen ingredient in the soil now AOL: How Often to Water Your Hydrangeas—4 Rules a Gardener Swears By Yahoo: How To Water Your Blue Hydrangeas To Keep Their Color Vibrant