Choose an area in your yard or garden that has well-drained soil and receives full morning sun for six hours and afternoon shade. Full sun is not recommended for the afternoon because it causes the hydrangeas leaves to wilt.
Place the hydrangea plant in a hole twice the size as the root system and the same depth it was in the nursery container. Space them 4 feet apart to give the hydrangeas room to grow if planting more than one. Water thoroughly to saturate the soil.
Water frequently during the growing season to keep leaves from wilting and blooms fresh. Install a drip irrigation system if possible to maintain a good water foundation.
Apply an organic mulch to retain moisture, replenish nutrients and keep the soil moist. This will result in promoting lush and big blooms according to Gardener's Net.
Fertilize in the beginning of summer using one application of time-released 10-10-10 flowering-shrub fertilizer suggests Demesne Website. Follow manufacturer's directions according to the size of your hydrangea plant.
Prune dead branches and leaves during the growing season. Deadhead the blooms when the colors begin to fade will promote new flowers to bloom.