Query whether the bees are pollenating it with itself and it lacks the incompatibility rejection mechanism, or whether the bees are bringing pollen from other plants.
It could be that it is self-compatible; at least some
H. minor plants are self-compatible. So the pods could be from self-pollinations. Or they could be natural cross-pollinations. Or they could be a mixture of both.
However, since it does often set pods naturally that means that all cultivars registered with
H. hakuunensis as the pod parent have a substantial chance of
not being from the named pollen parent. That is, unless the hybridizer took precautions to prevent natural pollinations.
