How do you say roses are red violets are blue alls i want you to know that i love you in french?

Les roses sont rouges, les violettes sont bleues, tout ce que je veux que vous sachiez, c'est que Je t'aime.

That is how you say, "Roses are red, violets are blue, all I want you to know is that I love you" in French.

If you need anything else just go to google Translate and type it in correctly.