Michael and Dennis - thanks for chiming in. I am mainly trialling varieties for performance in ground although on the long term I would be fine with having a handful of superior figs in containers if that is the only effective way to growth them. Out of 13 in-ground varieties, KB has reacted the most poorly to the cold in terms of coming back and setting fruit. I winterized it similarly to the others. So it may very well be that, in zone 7 and colder anyway, KB needs to be grown in a container to be a reliable fig. Then again, according to weather history we shouldn't be getting winters like we just had very often. Maybe if I could taste just one KB fruit I would be less willing to give up on it!