This is not a sales pitch for my business but some friendly advice about flowers.
PLEASE use a real, local florist. Be careful when googling a florist in your town because there are a lot of companies out there that just take orders, charge you extra, and pass the order along to a real florist. Other companies send cut flowers and an empty vase in a box via UPS or Fedex .They lowball the "price" and then tack on $30+ for Shipping and Handling(Pro-Flowers). If its 20 degrees outside, they'll leave frozen flowers on your porch.
As someone who delivers flowers to offices on Valentine's day, I can tell you that a dozen red roses in a vase arranged by a professional florist always kills!
Don't over-think it. Don't mumble about stupid, made-up holidays. Just do it. You spend $60 on beer & bait without blinking. Don't wait until Tuesday at noon to order.
Hint, send them on Monday and she'll be the first to get them.
Wherever you are, there is a REAL, local professional florist serving your town. They are always there for Holidays, Birthdays, Proms, Weddings and Funerals. Please support them.