The bark looks like it’s shredding. Is this normal? The leaves look healthy.
very unlikely that it is unhealthy.
guava is in the eucalypt family, and many eucalypts tend to shed bark as they age and uncover a smoother complexion of their trunks(quite the other way around with most other species-- which tend to have coarser bark with age/ never get smooth).
i see yours is a Psidium guajava sp, which tend to have a smoother and colorful complexion as it gets old, compared to other guava speces.
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Yes, this is perfectly normal.
Without supplemental lighting they decline indoors during the winter but bounce back once outside.
Also indoors the dry air from the air conditioning system will negatively affect them. They do better in a bathroom where the humidity is higher. I keep most of mine in a unheated attached garage in the winter under LED shop lights.
this is what a mature guajava species’ trunk would like when mature. Quite an attractive mosaic of hues, and note the smoother complexion. Other tree species tend to have coarser bark as they age, but many guavas and eucalypts tend to start barky, then strangely, gets smoother with age.
below is an even more striking cousin in the eucalypt family, check this out 
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So beautiful! Ty!
Ok ,@ jujuemulberry
We are on the same page.
I just looked through my photos for a pic . Of that ,an hour ago, so I could make apost .
It is the most beautiful example of exfoliating bark I have seen. ,!
I have seen photos of it on line for many years.
Assumed they must have been photo shopped .
Until I saw this tree ( and others ) in a park in San Jose C. R.
Actually the photos don’t do it Justus .
The colors are more brilliant than the photos
Your coment about eucalyptus brought my mind to this tree.
One theory as to why trees have exfoliating bark is ;
That it helps them shed epiphytes and vines that grow on them
Wish I could have a rainbow eucalyptus in my front yard.
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same here. I had a potted one while living in philippines where it is native to, but had to give it up(and the rest of my tropical aspirations) when relocated to usa. It sure makes a striking landscape tree.
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you’re welcome! and keep us posted on the progress of your guava. If it is the smaller-fruited guajava, you are more likely to get fruits at a younger age and at a smaller tree-size.