In general, hydrangeas prefer partial sun. Ideally, they will get full sun in the morning, followed by some afternoon shade to protect from the hot midday sun. This is especially true of large-leaved hydrangeas (H. macrophylla), whose large leaves are prone to wilting. Some varieties are more tolerant of full sun. Space hydrangeas anywhere from 3 to 10 feet apart, depending on the type. Always place plants based on their expected size at maturity!

When to plant hydrangeas? Fall is the best time to plant hydrangeas, followed by spring planting. The idea is to give this shrub plenty of time to establish a healthy root system before the heat of summer or the extreme cold of winter, making the colder shoulder seasons the best times to plant. Plant the bushes in the early morning or late afternoon. It is generally cooler and the plant is less likely to suffer heat stress from direct sunlight.