I'm not sure there is a simple answer. These are generally the plants that are found in rainforests on rich soils. So you can fertilise these fairly regularly with a general fertiliser. Even among this group some are more phosphorus tolerant than others. There are about 4600 species included together with over 3000 images and information about each genus.
Many people feel that the plethora of changes is designed to keep taxonomists employed.
I think that's an unfortunate view. I don't think that there is a rash of renaming for the sake of it. A lot of the present activity is to do with the publication of the Flora of Australia and the desire to have a rational system of naming in place for the many volumes that the Flora involves. I think we will see a slowing down of reclassifications as the various plant families are published in the Flora. More and more these lead to differences, even at the genus level, that are not obvious to the average enthusiast.