- Most types of hydrangeas grow as bushy shrubs. They vary in height, with small varieties staying around 3 feet tall and large varieties reaching over 10 feet tall. However, climbing hydrangeas grow like vines and climb vertical supports.
- Hydrangeas are deciduous, and they lose their leaves during the fall. They do not grow much during cold winters, and then they start growing again during spring and summer. Hydrangea flowers bloom during summer or early fall.
- Hydrangeas prefer growing conditions with lots of moisture and good soil drainage. The most popular type of hydrangea, the bigleaf, is hardy to USDA plant hardiness zone 6, which has minimum winter temperatures of -10 degrees Fahrenheit. Panicle hydrangea can tolerate USDA hardiness zone 4 with minimum temperatures as cold as -30 degrees Fahrenheit. The pH of the soil affects the color of hydrangea flowers. The flowers are more bluish in acidic soil and pinkish in less acidic soil.
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