This is our Sun Room which normally gets too hot late in the afternoon,
late in the summer. I planted a row of Sunflowers around it and not
only does their shade cool it off, but also, I believe, more plant
transpiration will help cool an area.
Also, notice that these are Teddybear Sunflowers, so instead of having
just one blossom per stalk like normal sunflowers (which makes the
plant fall over late in the summer), it has several blossoms on each
stalk which act as counter weights so the plants don't fall over.