You know what this means... hydrangeas!
And these are the smartest little flowers ever. I thought they were sweet peas, but they're actually called Four O'Clocks. Pretty appropriate name, since that's about the time they start blooming. They shut up tight during the hot summer days and only open in the cool of evening at night. And they smell WONDERFUL. I highly advise putting them in your garden, although beware they grow rather wildly.
One day I'd like to plant a full night garden. Wouldn't that be fantastic?