Ebay traders of invasive species say they were unaware of legal restrictions

Multiple listings of banned species found and since Guardian investigation 19 ads were closed down - but controlling the trade is akin to a game of whack-a-mole

A killer algae, a monstrous pondweed, a tree that has infested the Everglades and a dozen more of the US's most environmentally destructive plants have been discovered for sale on eBay. Online traders told the Guardian that ignorance of the law led them to create listings that had spread hundreds of illegal specimens across the country.

Ebay hosted multiple listings for 15 species from the federal noxious weeds list the nation's highest level of plant biosecurity. Most offered import to the US from abroad. But six sellers were hawking plants from within the country.