I've seen chemicals that claim to improve root formation on cuttings. I've noticed mistletoe on one of my gum trees. Because of the genetic mix within seedlings, plants grown from seed will often show a significant variation from the parent. As well, there are a number of Australian plants which can tolerate indoor conditions for extended periods. These are usually those species native to tropical and sub-tropical rainforests where the plants have become accustomed to low light levels.
Cordyline species grow well indoors and in air conditioned areas.
I've heard that I can encourage birds into the garden by planting grevilleas and banksias. But this loses sight of the fact that there are many other birds apart from honeyeaters and there are other reasons why birds might be attracted to a particular garden. To attract a variety of birds it's a good idea to mix many different plants of different heights and growth habits so that shelter and nesting sites are available. For example, planting lots of small, bushy shrubs, including those with prickly foliage, will provide protection for smaller insect and seed eating birds, as well as for honeyeaters. All banksias attract honey eating birds.