Thank you everyone! My poor guava tree leaves are still wilting, but I am giving it a ton of water (just enough to keep it in moist soil, not drown it). Should I be watering it every morning until it recovers to keep it moist or just 1-2x/week like my plumerias?
The potting mix does contain any add-in fertilizer, and before I got to this post, I did add in my own organic fertilizer (only a little bit - i used 1.5 huge bags of the potting mix).
Our balcony is pure west exposure and it's probably not getting a long period of direct sun. The balcony floor is tile, not concrete, and is generally quite cool. We have three plumerias and at least they are loving it.