Hydrangeas like full morning sun and afternoon shade. They also prefer well-drained soil. I like to add mulch around my hyrangeas. If your soil contains a lot of clay, you may want to do the same.
If you'd like to propagate your hydrangeas, you can try to do it by placing a clipping in water, or you can do the following:
1. Take a cutting from a branch that's about 5-6 inches long, preferably from one that didn't flower.
2. Remove the lower leaves from the bottom two leaf nodes.
3. Cut the largest leaves in half
4. Dip cuttings in a rooting hormone available at garden supply stores and insert into damp vermiculite.
5. Water the pot and allow to drain.
6. Cover the cutting and pot with plastic. Insert stakes to keep the plastic off of the leaves.
7. Wait 2-3 weeks for roots to form.
One other tidbit of information about hydrangeas: They are moderately toxic if eaten, because they contain cyanide, but in Japan, an herbal tea called ama-cha is made from crumpled, dried, steamed leaves. It's used in celebration of Buddah's birthday on April 8th.