i also have a improved meyer lemon they get about the size of grapefruits dont know why but they do
hahaha nothing speacial is fed except city water :P its my 3rd year with it and the first year i got 3 lemons 2nd year i got 12 and this year well see how many i get
i even germed a seed and is 2 feet tall already...no thorns so got lucky :P