I am concerned that if planted in the ground, this plant or tree could become a pest or a noxious weed in zone 8 temperate climates. There is a dracaena indivisa that is about 4 years old planted in a garden where I work. In a zone 6 winter, the cold kills it back to the ground, but it lives under the ground only to grow wider and taller the next year. At present, it was about 10 feet tall and 6 feet around, choking out other plants. We tried to eradicate it with no luck; the root must go 6 feet down or more, and who knows how far outward the side roots go, and if they will sprout new stalks! I planted some of these in whiskey barrels as "accent plants" 2 years ago, suspecting that it may have been a mistake, based on what I had seen with the one in the ground. It WAS a mistake! Not only did they kill the other things in the whiskey barrels and take all the soil and root room, but they grew gargantuan roots, breaking the bottoms of the whiskey barrels. In order to dig them out, we had to remove all of the soil. I am not sure what the fibrous roots that we missed will do, but if they all have the capacity to grow into new plants, this could be a huge problem! I strongly suggest more research into this plant! Many people in the pacific Northwest are now into "exotic" plants, many coming from New Zealand and other tropical and sub tropical places in the world and California. Here, these plants are becoming nuisances and invasives (such as the running bamboos, pampas grass, sumac trees and honey locusts for instance, and sea buckthorn, russian olive, etc. some of the pollens from the trees are such high allergens that whole populations are getting sick from them.) I am concerned that introducing "exotics", formerly relegated to conservatories and houses, is going to be more and more of a problem as global warming changes our ecosystems. The exotics look out of place here (much as we would like to pretend that we northwesters live in the sunny warm tropics), and they are pushing out the native plants. I'd like to find out more about if anyone else has concern about exotic plants in temperate areas, and what kind of research is being done as to their invasiveness! Thanks.