Joseph
Looks like you have a nice collection going. All these balsams are tender to frost. Impatiens niamniamensis grows well in a pot and in the wild will sometimes be found growing on trees. Give it a well drained mix and let it dry a little between waterings but dont let it go limp. Impatiens hians is a winter bloomer like grandis and both do well in pots.... actually they all do, if feed well enough. I have my grandis in a very large pot and it is happy (though I need to transplant it)and I have my hians in a hanging basket and doing rather well. Impatiens irvingii is very much like walleriana in looks but with narrow fuzzy leaves. You could try this one in the ground and do cuttings each year. It has been seen growing in shallow water in the wild. All would like morning sun and in a nice cool spot in the heat of the day. I personally havent tried any of my plants in the ground but I am really itching to do it, its just that my planting areas are over run with ivy and thorn bushes.