Sunflowers as window sun block?
I have two mobile home windows located inside my dog fence that recieve full afternoon sun. I read recently on another forum about planting sunflowers as a temporary non-toxic sun block for windows. If I was to plant some seeds in the ground this week, would they grow fast enough to help shade the windows? I am not overly concerned about flowering. How many seeds per window, how far away from the window, any other pro/con thoughts?