1st Place with 87 points:

From Aqua0174: "Plant; Purple Loosestrife (Lythrum salicaria) Zone: 6 Location: Juniata River, Central Pennsylvania Description: I believe this plant is a prime example of how beauty can be deceptive.This photo shows how loosestrife's dense and impenetrable stands are destructive and difficult to control."

2nd Place with 51 points:

From sallyg: "Invasive species- the path is set but where will it lead? Local flora being overrun with last year's growth of honeysuckle and tearthumb"

3rd Place with 39 points:

From Bob_71: "Buddleia, our familiar "Butterfly Bush" is considered an invasive, non-native species. Originally from China, Korea and Japan, it has become highly popular here. It produces mountains of seeds and sets seeds readily! This one is Buddleia davidii "Miss Ruby" and is furnishing nectar to the Monarch"

Runner Up with 35 points:

From laurahteague: "Autumn olive in full bloom...bees and butterflies love it, but it's listed as a severe threat by the Kentucky Exotic Pest Plant Council."

Runner Up with 31 points:

From DMersh: "Heracleum mantegazzianum, Giant Hogweed. Photographed SE England. Invasive in non arid temperate/subtropical areas of Europe/North America, very cold hardy to around -40C. Sap causes severe blistering and burning of skin, it does best in damp places like riverbanks."

Runner Up with 31 points:

From ginger749: "Dogwood from QLD."

Runner Up with 20 points:

From LadyAshleyR: "Bird's-eye Speedwell, origin: Europe"

Runner Up with 18 points:

From drthor: "Toadflax Snapdragon ... will grow and re-seed every where"

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