Gift Giving Etiquette
Flowers should be given in odd numbers but not 13, which is considered unlucky.
Some older French retain old-style prohibitions against receiving certain flowers: White lilies or chrysanthemums as they are used at funerals; red carnations as they symbolize bad will; any white flowers as they are used at weddings.
Prohibitions about flowers are not generally followed by the young. When in doubt, it is always best to err on the side of conservatism.
If you give wine, make sure it is of the highest quality you can afford. The French appreciate their wines.