chong

I would go with citrus, guava, and banana, in that order. I.e., if you want to grow 1 plant type, citrus is best bet. If 2, then citrus and guava. For citrus, make sure sure the plant that you get is grafted on Poncirus Trifoliata (Flying Dragon) rootstock or similar hybrid from this species. This rootstock is very cold hardy and has a dwarfing effect on the scion.

I have several citrus in 15-gallon pots that are in bloom and fruiting at the same time. One of them is an Oro Blanco grapefruit. I have a Variegated Ponderosa Lemon in a 5 gallon pot that blooms all the time, but never sets fruit. Guess it's time to repot to a bigger one. Calamondin, as I mentioned earlier, will fruit in a 1-gallon pot but you're not going to get very many that way, plus you will need to watch the soil to make sure that they do not run dry. A 5-gallon pot is a good compromise for Calamondin or Kumquat. 10-gallon would be ideal. For other citrus or guava, 20-gallon would be a minimum.

For super dwarf banana, a 30-gallon pot would be minimum. The dwarf banana, 50-gallons.

I had a Cherimoya, a Sugar Apple relative, in a 15 gallon pot in my greenhouse for over 5 years, and it never bloomed. I gave it away to a friend. If you keep the Sugar Apple inside your house, make sure it is in a very bright and warm area. You can try one that is grafted, and you might have better luck with it fruiting.