I have a dwarf ruby red grapefruit tree that is roughly 2.5 years old. I harvested one fruit this past january and it was delicious! It was the only fruit on the tree. The tree is very healthy, about 7 feet tall with full foliage. I have some varigated yellowing of leaves at the top. I located the diagonal line of the hybrid for a potential rootsucker and clipped off everything below it. My local garden center gave me a nitrogen supplement. But after reading a few posts and hearing about young fruit trees needing several years to develop a root system, maybe I have no problem. One grapefruit in 2.5 years seemed meager but maybe that's normal! I planted a dwarf cara cara navel next to the ruby red the other day, so I'd like to know what to expect with that tree...