Indeed, fast growing plant species that are highly tolerant of environmental stresses and able to produce large quantities of seed and very useful for both pastures and biofuels, simply because they produce lots of biomass with next to no looking after. The trouble is that these characteristics are the same as those that make invasive weeds.
The real dangers arise when fledgling industries that have no real economic basis go broke. The growers simply walk off the land and let it go. This has been seen with quite a few new animal industries (ostriches and emus come to mind immediately) and plant industries (remember sisal?, giant reed?, more ornamental plants than I can think of?). Once the damage is done, there are no funds from the industry to clean up the problem. Better to do a risk assessment first and keep the likely worst offenders out.
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"How many legs does a dog have if you call the tail a leg? Four; calling a tail a leg doesn't make it a leg." Abraham Lincoln
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