Should be self-fertile. But as with many other fruit producing plants, may produce better cropping if another clone is nearby.

Well I thought it was self fertile too, but not one berry in all these years. Not one.

You have just the single plant? This is most often used as a groundcover here so frequently planted in multiples but even then not a huge berry producer. But they do produce :-)

There's a paper online that mentions A. pungens being mostly self-incompatible. Also I think heavily shaded A. uva-ursi I see tend to be largely flowerless.

Mine is in full sun and flowers beautifully, and just keeps getting larger and larger every year. Nary a berry though.

I have clay loam soil and have simply given up on growing bearberry. One of the few times I have seen it in cultivation is here in a raised area in downtown Washington DC. It is one of those plants that has to have the perfect location.

There is a well-known relic colony of Gaylussacia brachycera in Pennsylvania. It covers several acres, I've been there to see it. It is believed to be all one plant and it seldom or never makes fruit. Perhaps those plants which spread vegetatively lose the need to bear fruit.

Poor, acid sand definitely describes my soil. And my bearberry is gorgeous, but never a single berry.