yellowing leaves

I recent acquired this small premna on march 5th (not sure what variety, Though the seller said it was Indonesian). When I first received it, it had dropped a lot of leaves from shipping stress but then recovered with new growth within a couple weeks. Since I've had it, I do get a yellow leaf...

As the title says, what happen with my water jasmine. I already tried to give it fertilizer (16-16-16 + tiny amount of iron micr via foliar spray.

I noticed this morning that my kotobuki pine is yellowing on the tips and in the new bud. Is this over watering? Too much sun? Or have I hurt it some other way?

I have a Green Island Bonsai (Ficus Microcarpa) that was gifted to me at the end of November. I am unsure of the age of the bonsai, but its pot measures 9.25” x 6.5” at the top. Here is a picture of it when I first got it: I live in SE Florida and the plant is out on a balcony where it gets...

Hello! My boxwood up until this point was thriving. All of a sudden his leaves started to turn brown/reddish. I noticed today some tips are a little yellow. I moved him out of direct sunlight because it seemed it was a light issue but I was just guessing. Please let me know your thoughts...