Choose an area for your hydrangea that receives morning sun and afternoon shade. Zone 7 is fairly temperate, but its summer sunlight can be quite strong. Do not select a site that gets full afternoon sun or heavy shade (such as under a large tree). An exception to this, according to hydrangeashydrangeas.com, is the paniculata hydrangea, which will grow in full, all-day sun if watered adequately. They need at least 5 hrs of sunlight each day for good blooming.