Elfie, this was a donor seedling and the guy had no clue what it was. I don't think he had ever even seen his plant bloom. He sent me the plant two years ago. I don't know whether the seedling was actually grown from seed or from a cutting, but in any case, I would say my tree is now two years old. It would be 6-7' tall and 3-4' wide if I had not trimmed it back in the fall, knowing it would go into my "Everything Else" greenhouse. It is now a 5'x3' tree and is putting on new growth on those cut branches.
Since there are scant few citrus plants anywhere within a hundred miles of me, I wouldn't think I even have to concern myself with the greening problem. It sure sounds like that's a big thing down where you are though. That's too bad considering all the thousands of acres planted in citrus in Florida.