Starry stonewort has become a poster child for invasives. Expensive to control and nearly impossible to eradicate.

People spread jumping worms, typically by transporting horticultural materials (plants, mulch, soil) contaminated with cocoons, or by dumping earthworms used as fishing bait.

Court Urged To Let Older Plants Draw In Water Without Technology That Protects Marine Life. ... Supreme Court Weighs Power Plants Vs. Fish. December 2, 2008 / 3:25 PM EST / AP ...