Between 28 and 57 percent of the state’s coastal marshes could disappear by the end of the century, victims of a rising sea, coastal development and polluted runoff.

SCARBOROUGH, Maine — As the weather continues to brighten, Mainers may be looking for ways to enjoy the outdoors this spring.

European marsh thistle, a terrestrial and wetland herbaceous biennial in the Asteraceae family, is an invasive plant that prefers moist soils. European marsh thistle frequently invades fens, wetlands, ...