My DH used to send me flowers at work, for my birthday or an anniversary or just because--maybe once or twice a year. I'm an engineer, and it would annoy my (male) co-workers, because they said DH made them look bad. Since I became a SAHM, he's sent them a few times, too. I can't say I'm a huge fan--I'm too pragmatic, I think of what else the money could be used for.
What I DID really appreciate was, when he found a fire dept. that was doing a rose fundraiser. They would get an entire truckload of roses, and then sell bouquets of a dozen for $5 each. DH would typically get 3 dozen--one for me, one for each of our girls. It was a win all around. In upstate NY, there were a couple of fire depts. that did this every Valentine's Day.