In Colorado the temperatures are not high enough to sweeten white grapefruit as sweet as Florida grown fruit. Therefore, I have continued to leave my Marsh grapefruit hang on the tree until the end of May. Over the months I sampled a fruit every couple weeks. And every couple weeks the fruit became a little sweeter. Today, the 21 of May I ate two of the grapefruit and they were quite sweet. I noticed that when I picked them they were also some what soft and juicier . Time heals all things.