Too much of a propaganda piece for me. Drugs are bad, Mmm-Kay. Specieism is bad. Non-native plants are bad. Heck even reporters are bad too. Way too preachy. Cautionary tales are fine with me but only when the issues they are cautioning against are discrete and not being shouted.
I did like however, the concept of an invasive alien specie, but it seems that if the governments of the world thought it was such a disaster, they would have more than two park ranger hacks organizing a band of volunteers to repair this eco mess. The only reason I say this is because these are not Terran plants and such have a direct devestating effect on the planet.