Why No Blooms on Camellias and Hydrangeas?

Ask the Expert: Camelias and hydrangeas don’t bloom
All the plants are 2 years old. They all look very healthy. They received fertilizer in the spring (10-10-10)and this summer I was able to give home made compost to all of them. We live in the North Georgia mountains, have clay soil, and they all receive only part sun/or shade. When I planted them 2 years ago I mixed in a mixture of mushroom compost or cow manure compost with planting soil. What am I doing wrong? Thank you so much for your help.  Inge