Technical Abstract: Non-native (alien, introduced, non-indigenous) plants have served as valuable crops throughout history. Increasingly, research has been directed towards identifying new biofuel crops, including non-native species, as sources of energy. Several plant traits deemed characteristics of an ideal biomass crop are also features commonly found among invasive grasses: low energy into maintenance relative to the production of energy-rich biomass; efficient use of light, water and nutrients; C4 photosynthesis; nutrient translocation to storage organs during the non-growing season; and perennial growth. Some candidate species for biofuels, such as Miscanthus x. giganteus and Arundo donax, have many of these same traits. Introducing some plants as biofuel sources may be safe, but this assurance will only be evident following explicit agronomic and ecological risk-benefit analyses, which are already mandatory for the introduction of other potentially beneficial species. Such analyses will require agronomists and invasion biologists to collaboratively assess ecological risks prior to introducing potentially beneficial crops, or in carefully quarantined field plots, to ensure that we do not inadvertently add biofuels to the already raging invasive species fire.