I have two 5 gallon guavas for 1.5 years, they have not shown much growth, currently about 1.5 feet tall.
I am not sure if pot size is the limiting factor here, how tall do guavas typically grow in 5 gallon pots? Should I upgrade to 15 gallon?
yeah, i certainly would.
they are hungry plants and need a lot of organic matter.
mine go through compost fast. in containers, they eat it all up
then you are left with a lot of roots and a handful of perlite (lol)
and at that point they need water every day in the summer.
i had taken a root-cutting from my first guava
and it started producing fruit at under 2ft tall
i put it in a 7 gal container 4 months ago with a lot of compost.
i am guessing it will outgrow it in 2 or 3 months.
it has about 15 or more small fruit on it though...
i guess you could keep them any size with pruning,
but you would probably need to root-prune, or re-pot with added compost
pretty often as they grow fast.