Name: greene Savannah, GA (Sunset 28) (Zone 8b) I have no use for internet bullies!
Sweet Peas are pollinated by bees and bees can fly up to 4 miles from their hive location. Your plot may not be as isolated as you think and the bees may have visited may other colors before visiting your plot.
According to this site: http://www.saburchill.com/chap... ... "The sweet pea is an excellent example. Its flower structure allows only the bee to enter because other insects do not have the correct size or mass..."
Sunset Zone 28, AHS Heat Zone 9, USDA zone 8b~"Leaf of Faith"