I'd think you'd be MUCH happier with some inexpensive bamboo shades or other window treatments. It will take some time for sunflowers to grow tall enough to shade windows.

I second rhizo's suggestion. A roll-up shade hung from the eaves is quite a bit more reliable.

Another option, perhaps for next year, is a trellis with a climbing squash or gourd.

Thanks ya'll. This is a rental unit and therefore I can not attatch anything new to the structure. I already have blinds and drapes inside. Well, the sunflowers were an interesting and inexpensive thought- perhaps if I could have planted them early on (-: