What does it mean when you receive 11 flowers instead of 12?

During our relaxing dinner, Hailan (patiently) explained to me (again) about the puns that result in bouquets of 11 or 19 flowers for lovers (I mentioned this in my entry for Feb. 29 below.) There is a proverb: "Yi Xin Yi Yi," which translates roughly "One Heart One Thought." This means something like "dedication" or "commitment." The first and third "yi" are the number "one"; if you were to say eleven as "one one," it could be taken as a reference to the proverb; hence 11 flowers represent commitment. As for nineteen: pronouncing the numbers separately yields "yi jiu." This is a homophone for something like "desire long-time," taken to mean a wish for the longevity of the relationship. It's simple, isn't it?"