Hydrangeas prefer acidic soil. The plants produce blooms that often grow in shades of blue, pink and white. Hydrangeas need protection from frost in the winter, but you can also grow them in pots indoors with the right growing environment. Potted hydrangeas look decorative in homes, and they will continue to produce new blooms with proper watering and pruning.
Water the hydrangea while it remains in its original pot. Allow the water to drain completely.
Select a larger pot if the hydrangea appears crowded in its current pot. The roots will begin to grow out of the drainage holes if they become too crowded. The new container needs drainage holes. Fill this pot with fresh potting soil designed for acidic plants.
Pull on the hydrangea plant gently. This will loosen it from the pot.
Brush the all the excess dirt off the hydrangea. Tug on tightly wrapped roots to loosen them.
Plant the hydrangea at the same depth as the old container. Backfill the hole with the potting soil and tamp it down firmly.
Water the hydrangea immediately after you repot it. Water it daily for seven days, and then only water the soil when it feels slightly dry to the touch. Avoid letting the plant completely dry out, or it may begin to wilt and die.
Fertilise the hydrangea every two weeks throughout the growing season with an acidic liquid fertiliser. Avoid using a fertiliser that contains phosphorus for hydrangeas that have a blue colour.
Place the potted hydrangea in indirect sunlight. Pinch off faded flowers and trim the top quarter of the plant in July to control the growth.
Water the hydrangea at the soil level, because powdery mildew will grow if you get the leaves and stems wet.