I have a Moro that is about 20 years old. Planted it as a 2 ft tall 'stick'! So, no flowers or oranges for about the first 6 years, then we had about a dozen oranges and it was off and running. Mine is on an every other year cycle since it started setting fruit- last year I got a total of 6 oranges. Lovely, huge and very juicy, but only 6! The year before last, I took about 8 large bags to work, shared bags with all my family and neighbors and left the oranges at the very top of the tree for the woodpeckers. This year the tree was white it had so many blooms and while it has gone through its usual fruit drop thinning, it is still covered with oranges.
The oranges to not keep well on the tree, nor when they are picked, was told it is because they have a low acid content. Once picked they need to be eaten within about a week and if left on the tree they will overripen and then the bottom splits open and the juice just drips onto the ground. On the heavy bearing years, I also squeeze the juice and freeze it, since I have so many!
I do recommend the organic orange tree fertilizer from .... Miracle Grow? (Found it at HD). I also found it really does like to be fed 4 times a year and I deep soak it, letting the water slowly dribble out for about 24 hours every 3 weeks once it has bloomed. The fruit is not ripe until Feb/Mar and I have to beat the neighborhood kids off when they want to pick in Dec/Jan, but I think it is well worth it.
Greenfield Citrus Nursery has an orange festival every year and they give alot of excellent information. If you take a ripe orange with you, they usually can tell you what variety it is.
