How to Get More Hydrangea Flowers in Your Garden Hydrangeas are some of theshowiest blooms out there. How to get the most blooms from yourhydrangeas depends on what kind it is. Panicle hydrangeas do best in all-day sunwith regular watering and plenty of compost. Deadhead panicle blooms as they fade. Smooth hydrangeas do wellin full sun if the soil stays moist. They also like regular watering and lots ofcompost, though they don’t require deadheading. Bigleaf hydrangeas do better in half-day sunin average soil, like regular watering, andshould get compost added to the soil yearly. Don’t prune unless necessary and,if living in a colder climate, wrapand insulate the stems during winter.