Oh! There aren’t many details yet!
I started these from seed just last summer. Three varieties - cas (costa rican), strawberry, and a wild strain from seed harvested on Maui. That’s where I fell in love with the fruit, and I hope they’re as I remember. They’ll be in containers, and are really my first container tree experiment. I hope they’ll fruit, but I have a while to go before that!
Growing zone will allow summers outdoors, which is the eventual plan. As it is, my plant room temperatures approximate Hawaii’s zone, so I hope they’re okay. Need to replace the deck outside the plant room before they can get any real outdoor time, and that’s a few years away yet.
Guavas are usually zoned 9-11, so…maybe? They’re deciduous, will drop their leaves in a subtropical environment. My plant room isn’t heated as well as the rest of the house. The lowest it got over the winter was about 40°F for a few hours. After that, I started leaving the door open to the rest of the house overnight. We never felt less comfortable in the house, but it stopped the room from dropping below 50 again for the rest of the winter.
Most of the guava’s leaves turned red. Strawberry didn’t, but they did discolor a bit. The trees definitely went dormant. On two of the wild guavas, the top leaves got crispy, but didn’t drop. They may have damaged the terminal growth point. Early to tell this spring, but it looks to me like they’re branching below that point now. I just repotted today in good root-promoting soil, so I expect to be able to evaluate their top growth after 6 weeks or so.
I have a wide, unused, south-facing brick wall (mmm, royal adjective order) and I’d love to try espalier against it. It’s not very protected though, so I’d probably have to do what you did and get removable greenhouse covers.
Anyway, that’s a lot of anecdata but unfortunately the it’s all I know. Maybe a long winded way of saying “sure, give it a shot!”