My in ground Marsh grapefruit set its very first crop this year (4 fruit). All 4 are of good size. I'll pick my first ever Marsh this evening, and have it for tomorrow's breakfast. I let them hang on the tree until March to get fully mature. I know it will not taste like a grapefruit taken from a 10 year old tree, but it should be good. I'll know in the morning. Next year the tree should put on 15 to 20 fruit, followed a year after that by pretty much a full crop..