Place your potted hydrangeas in areas that receive morning sunlight and afternoon shade, for best growth.
Water potted hydrangeas regularly, as these plants require consistent water for proper flower growth and fare poorly during drought. Water the plant often enough that roots remain moist without maintaining wet soil, which may lead to disease problems. Water when the top layer of soil or potting mix feels dry to the touch. Check soil more than once on a daily basis until you are familiar with how often your plant needs water.
Prune hydrangeas with shears after flowering. Remove faded blossoms to encourage new growth.
Fertilize potted hydrangeas with a water soluble fertilizer, such as a 20-20-20, following the instructions printed on the label.