IMO Garcinias should go in the ground ASAP; they develop large/deep roots that quickly get stunted in pots. They'll grow faster in the ground after initial period of root growth. Imbe in particular has massive root ball.
All my Garcinias do well in SFla weather year-round in the ground. They're very resilient.
Put them in the ground with mix of potting soil and local soil, use plenty of mulch (they do fine in mixed limestone soil once they get bigger and roots expand beyond planting media)
I provide a dedicated mini-sprinkler for each plant and water as often as daily.
If they're less than 24' I would provide some temporary shade, although they can do ok in full sun if plenty of water.
I do chelated iron, minors and fertilizers every 3-4 months.