A question I have is what needs to mature for a citrus tree to produce good tasting fruit? is it the root system that needs to develop to the point it supplies the tree with all the necessary nutrients for good fruit or is it the scion growth that needs to mature?
For instance, could you graft on to an older existing tree with a new scion variety and get pretty good fruit in a couple of years?

I have several remaining Flying Dragon rootstocks left, like to graft several varieties like Pomelo or mandarins onto them, will that work?

In the US, I don't think there's a seeded kishu. In China, I've eaten kishu-like mandarins with seeds. That's just the normal one they sell everywhere.

Mr. Texas I believe your south Texas location is to warm for the fruit to turn red.

My New Zealand Lemonade (NZL) tree has produce a nice crop of fruit.  This year I let the fruit remain on the tree until they were fully mature and very yellow.  The mature fruit was about the size of an Eureka lemon.  Yesterday I picked a couple fruit for taste testing.  Unfortunately the fruit did not taste like lemonade, but rather had a washed out lemon taste to it.  I would not say they tasted unpleasant, but rather bland.  The sour aspect was much less than that of a lemon.  In the past, I remember eating the fruit while it was still green, much the way one eats a lime, but don't remember much about the exact taste, other than I liked it.  The tree has a ton of flowers on it, so new fruit should be coming soon.  I plan on tasting the new crop at various intervals trying to determine when the fruit should be picked. Anyone else with a NZL tree have comments concerning picking time?

We ended up hitting 14F with wind blowing at 10+ mph here in western Louisiana last week, I had all my citrus covered with C7 Christmas lights or 250 watt heat lamps under the covers (tarps, sheets, blankets, whatever I could find) on each, which only helped so much.  I am still waiting to see the overall damage, 30-50% leaf drop on most of the trees so far, though with lots of curling dried out leaves still hanging on the trees.  While surveying the damage today I found one of my smaller (3 ft tall) 2nd year in ground Satsumas currently has a total of 4 leaves growing on a limb just above the graft line that look healthy, all other leaves on the tree a showing significant curling, drying, etc.  My meyers and Cara Cara seem to have fared better though the Cara Cara, now about 7 ft tall is showing lots of curling leaves.