Are these root systems invasive, like the root systems of species like ficus? If so, will planting in a plastic non perforated container within the soil of the main planter pit restrict the invasiveness?

might be best to stick to things like palm trees and cordelines and dracaenas. anything from the rain forest with a buttress is going to have roots that could be invasive, just think there are some things we can have living with us and other things should be a safe distance away.

most gardeners are at these other places now:

garden express

ausgarden

you are weelcome to post your question there as well.

len