In one of the older POMONAs there is an article from (name escapes me) who studied Vaccinium arboreum, so called "farkleberry" of the South. It was sufficiently tolerant of alkaline soils that northern highbush blueberries could be grafted on the species and they would survive and produce when they would die on their own roots. One old timer apparently had a patch of such grafted berries that was 25 years old and in good production. I have a piece of V. arboreum grafted on highbush blueberries, and it's quite interesting. I had thought of crossing the two, but the V. arboreum doesn't bloom until the highbush types have ripe fruit.
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