What side of the house ? N-S-E-W facing ? 6 or more hours of full sun ?
Hydrangeas like some shade, are only messy when you trim them in the fall.
"All hydrangeas will bloom and grow well in morning sun and afternoon shade. This is especially true of the commonly grown Hydrangea macrophylla. Macrophylla hydrangeas are the blue and pink mopheads and lacecaps.
The further north one lives the more sun hydrangeas need and can withstand. While mophead hydrangeas can grow well in all-day sun in Chicago, they would struggle to survive in afternoon sun in Atlanta. Some visitors to this site who live in cooler climates such as the northeast or northwest report that their hydrangeas do beautifully in full sun all day.
No hydrangea will do well in HEAVY shade, such as under a shade tree. The blooms will be sparse and will not develop fully.
If your landscape is mostly sunny (and hot), you may wish to grow the PeeGee (paniculata) hydrangea, which thrives in all day sun as long as it receives adequate moisture. PeeGee hydrangeas actually need at least 5 hours of sun per day to bloom well.
The Oakleaf hydrangeas will also grow in sun or shade, but the blooms last longer if they get a little afternoon shade in hot climates. The leaves on the Oakleaf hydrangeas will "color up" best in the fall if they receive some sun."
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