[smallerfish]

> I have Acerola cherry too—but the only ones that fruit or flower are in full aun.

Interesting, I've always read in permaculture books that nanking is a good understory fruiter, and my local permie nurseryman said the same. Maybe it's a myth. How shaded are your non producing ones?

Oh and I have a nicely producing lime tree (at least 20+ years old) that at best gets 1 hour of dappled sun a day - it's on the edge but with very thick canopy above it. Here they call the variety "limon" - my understanding is that it's an ancestor to modern lime/lemon varieties.