How Fast Do Hydrangeas Grow in a Month?

Growth Rate

• The Clemson University Cooperative Extension service indicates the growth rate of the hydrangea shrub is considered to be rapid. It typically achieves an overall height of between 4 and 12 feet at complete maturity, dependent on the variety. How fast hydrangeas grow in a month is also dependent of the type of hydrangea.

Time Frame

• Trees and plants that grow 25 or more inches annually are considered to be fast-growers, according to the Arbor Day Foundation. Therefore, hydrangea trees or shrubs can be expected to increase in size approximately 2 inches monthly during the plant's growing season. Available sunlight, water and soil conditions all affect the growth potential of the hydrangea.

Fun Fact

• The pH level of the soil impacts the color of a hydrangea. Flowers will turn blue in highly acidic soils, while earth dosed with large traces of alkaline produce pink blooms. Pink varieties come to fruition with a soil pH of 6.5 to 7.0., while the blue hue will form when soil holds a pH level of 5.0 to 5.5.