Your citrus dwarfing rootstock is flying dragon trifoliate. It is only slightly dwarfing. You can see pictures of a pink grapefruit on trifoliate(25feet) and flying dragon trifoliate(8 feet) on my web site. Both trees are about 10 years old. I haven't found flying dragon to be very dwarfing. I have 4 satsuma trees that are 4 years old. The one on flying dragon is as big as the 3 others on trifoliate. All are about 6 feet tall. They are in the ground outside. Flying dragon rootstock bears excellent fruit and bears early.
I would recommend for your potted citrus a potting mix of 50% washed sand and the rest can be store bought potting mix. I have killed many potted citrus in 100% commercial potting mix because it doesn't drain well enough. But it sometimes rains here 6 inches in a day and 24" in a week!
SE Texas near Houston z8b/9a but 9b since 1989
http://members.fortunecity.com/pjsauber/
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