When I first started, I used a water meter for my first bonsai (a bougainvillea). It eventually died due to overwatering. The problem is that most bonsai soil has too much inorganic. This allows more air into the soil, which the meter will generally read as "dry". They're usually calibrated more for traditional potting soil.
If it were my tree, I'd repot it now. Bougies can be repotted with success in summer. If you wait, you'll have to wait until next spring to do so. The substrate looks a bit iffy to me, but I'm not familiar with Florida nurseries, so it might be good quality. The moss makes me suspicious though.
Your tree is beautiful, and it will be a great shohin once you prune it back a little and get the foliage more compact.
Welcome to the forum. If you create new threads for your other trees, you'll get tons of input, links to good info, and advice. But none of that will compare to a good bonsai club.
I purchased this bougainvillea last week. The clerk took the tag with genus and species on it off without me realizing so i dont know the type of boug that I have. The leaves have been yellowing and dropping off. We live in south florida and are keeping it in our screened pool area that has a north exposure with light all day and filtered western sun late afternoon. I hope its just a normal readjustment time. Would love advice regarding what to do with the spent branches. Leave or cut back?? Thinking that I may need ro feetilize but nervous if the plant is stressed?? Thanks in advance for your insight
