Duckweed or Pennywort? If you’re unsure about aquatic plants, a new pocket-size guide can help.
It flags invasive as well as endangered species and cautions that trying to mechanically control some plants can actually make them become more of a problem if they reproduce quickly when broken apart.
View a PDF here, or purchase a hard copy through the Penn State Cooperative Extension Westmoreland County, 214 Donohoe Road, Suite E, Greensburg, PA 15601. Copies are $11; mail orders, add $2.00 shipping.