Laaz, I had briefly thought that too, but this tree flowered in Mid June, probably 1.5-2 months behind when most Satsumas down south flowered (takes a while for things to warm up here in the Spring).
It's been ~150 days since the flowers began to open with the St. Ann
In comparison, my container Armstrong Early flowered in Mid-Late March and had mature fruit in Mid Sept. (~170 days).
In the future, I'll probably also try Xie Shan and the Armstrong outside.
Mark, I'm surprised you don't have at least one or two already.
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Satsumas are one of the earliest sweet citrus to have mature fruit in the Fall.