Answer: Tangerines generally mature in December or January, but knowing exactly when to harvest takes some experience. Color isn't a good indicator, but sweetness is, so you may have to pick a fruit and taste it to see if it's fully mature. Although this isn't very scientific, it works. It's also helpful to know that ripe fruit can remain on the tree for several weeks. If it were my tree, I'd wait until the first week of January to give one of the tangerines a taste test.
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