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I planted Blue Java at my Mom's house in Glendora (L.A. county) some years back and they do very well, and she and I and everyone else who tastes it likes the fruit. But I haven't tried too many of the other banana varieties commonly grown in Southern California so I can't say with confidence how it compares.
I planted 2 "Blue Javas" last year. One in morning shade in March and one in full sun at the end of April. The one up against a west wall only grew to 4 feet. Not sure if it was because of the lack of sun, soil, roots tampered with by gophers or what. The one I planted in April unbelievably grew from 18 inches to 12 feet in 4 months. I cut it back down to 6 feet and covered it for the winter. It's back up to 12-13 feet with a trunk the size of a telephone pole. It also has 5 pups, the biggest at 7 feet now. Unfortunately no signs of fruiting. I'm inexperienced in the way of bananas so I don't know what to expect. I planted a goldfinger this April and it appears to like our full sun MUCH less than the Blue Javas. It was growing but there was a lot if leaf burn. I finally put a shade over the GF.
Planted 4 Nam Wah and 2 Blue Java at the same time same size March 2016. The Nam Wahs are much more vigorous than the Blue Java for me. They've really won me over. Each Nam Wah is already fruiting size or close to it with 5-8 pups each (some of which I separated). The Blue Javas are half the height and a third the diameter with three pups each. Reading online, it looks like most people with both plants ended up preferring the taste of Nam Wah.