Write her a check for a million kisses.No doubt she'll be desperately hoping for poinsettas so she can gobble them up in the feeble hope of the Reaper granting her a sweet, sweet release from gamma hell. This is actually pretty good advice, however, if you want to get rid of a girl but don't want to take responsibility for the breakup.
Send her a birthday card EVERY DAY FOR A MONTH!
Send a special note with special flowers:
Tulip: "I've got two lips waiting for you."
Sunflower: "You brighten my life."
I would also suggest trying to harmonize with yourself while singing "Only You" to her in a restaurant when you're out to dinner with her family. The more out of tune, the better.