I also live in orlando, and have tried growing a Mexican guava plant. I've had it about 3 years and am about to give up on it. I've had success growing avocado, peach, plum, pineapple, and citrus trees, but no success with the guava. I have a mango I just started, so am also curious about that. I haven't tried banana, but after reading your success I might give it a shot.