I live on top of one of Cincinnati’s 7 hills, so I consider my neighborhood of brick homes storing and radiating heat to be a micro climate. In fact my mother told me that the neighborhoods of Mt. Auburn and Clifton Heights always had Crepe Myrtles thriving. This is the fourth summer of my pot grown guava growing outside. Yes, I do bring it in 
Regarding when guava begins bearing fruit, is it age or size?
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Any flowers yet?
somnamblst I live in the mill creak valley 3 miles from the Ohio river. My frosts start at low prediction around 30F. Most stuff is killed when the lows hit 28F Airport temperature. I usually make it into November before my first frost
I think is a combination of few things besides age and size.
Giving them a head start by been inside the house through out winter till late spring/ summer, feeding your potted plants is a must and pinching the tips ( the center piece between the young leaves ) helps to promote more branching and with branching comes flowering.
What size is your pot?
No. I read that unpruned guava flower in fall. And that pruned flower in spring. I have fertilized all summer, sometimes with general purpose Miracle Gro and other times with flowering specific Miracle Gro. It grew gang busters this summer. It gets all day sun as it is South facing.
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Me too. I had a frost blanket around my peppers, and did not harvest before December as they are next to a brick wall.
When I was buying a guava tree in Lowes, the guy next to me mentioned that I need to tip the end of the shoots after 4 or 5 pairs of leaves. This will make the tree flower more and keep the tree bushy and compact. I have been doing that with my red Malaysian and it has been doing well. Although not sure if not tipping it will reduce the blooms.
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