The second step to planting hydrangea is the actual planting. The state the flower was obtained in determines when the planting should take place. Hydrangeas that were container grown should be planted in the spring or fall months. Bare root hydrangea should be planted in early to mid spring. The hole should be large enough to provide enough room for the roots to be spread out. Once the roots have been spread, dirt should be applied a little bit at a time and pressed down firmly, both to remove any air pockets and to provide proper support for the plant. The crown of the plant should be only an inch or so beneath the surface of the soil.
Planting hydrangea is only half of the initial care stage. After planting, mulch should be applied to the hydrangea to help prevent frost heaving. In areas where the temperature drops below zero degrees in the winter, mulching annually in the late autumn should help to protect the plant from becoming too cold in the winter.
The last step to planting hydrangea is optional, and only works on some of the hydrangea species. This is to fine-tune the bloom color. Adding some lime to the soil will turn the bloom to a pink for the following growing season. Supplying the soil with aluminum sulfate will give the soil a higher alkaline content and make the blooms a blue tint. Growing hydrangea is a very rewarding experience, as the blooms are large and very lovely.