HydrAngeas Demystified

Color

All hydrangeas undergo some color change as their flowers age, but only bigleaf and mountain

hydrangeas can change their color in a predictable, controllable way. It is not solely the pH of the soil

that is responsible for this change – it is actually the presence of aluminum in the soil.

• Certain varieties of bigleaf hydrangeas cannot change color. The rich red blooms of Cityline®

Paris hydrangea are a good example. Similarly,

white varieties of bigleaf hydrangea will not

change color.

• I t is easier to change a hydrangea from pink to blue than from blue to pink, but both endeavors

involve making chemical application in specific amounts at specific times. A soil test is necessary

to determine the best course of action. If you decide to try to change the flower color, shop for

products carefully and read all directions. 

• Pennies, nails, aluminum foil, or coffee grounds in the soil will not change the color!

Tips for Success

• Moist but well-drained soil (hydrangeas will not tolerate wet feet – ever!)

• Some sun each day. Most people think of hydrangeas as shade plants, but they look

and flower best with at least four hours of sun, ideally in the morning. Panicle

hydrangeas are the most sun tolerant, and can take full sun in northern climates.

• Plenty of water, especially as they are getting established. Hydrangeas have shallow roots,

so they dry out quickly. A two to three inch layer of shredded bark mulch is a useful

addition to any hydrangea planting.