Most hydrangea shrubs thrive in full to partial sunlight (4-8 hours of sunlight per day). However, they can handle shade, depending on the type of shade and timing. Hydrangea shrubs in warm climates do best when they receive morning sunlight and full shade during the hottest part of the day. When selecting an area to plant in, remember that too much shade will weaken the shrub's stems, making them floppy and lead to fewer blooms.