I am wondering if I’m doing something wrong since one of our Endless Summer hydrangeas is not blooming. Both hydrangeas were planted at the same time. We added some soil meant for Azaleas. The hydrangeas are in the shade all day. We have wrapped a soaker hose around each plant so they get watered at the same time. The flowering one is planted next to a man hole which limited its growth on the right side. They are planted in a heavy clay soil. Please help! How long should we be watering them?