Sending flowers is a good way to express love, celebrate anniversary, congrats wedding, celebrate birthday.
It is very easy to send flowers to someone if you live in same city, just go flower shop, pick flowers, and then you can send recipient flower yourself or ask flowers shop send for you to recipient.
If you two do not live in same country, it will be a problem for you, maybe you have no idea how to send flowers to other country from your country.