Help Protect
Maine Lakes

Invasive Aquatic Species Resources

Invasive Plant Plant Resources

For Invasive Plant Patrol documentation forms and tools, please visit the IAS Documentation page.

Maine Lake Data

The Lakes of Maine website hosts all of the lake data our volunteers collect. Find out more about the data we have available at

Invasive Plant Patroller’s Handbook

2013 IPP Packet Cover

The Invasive Plant Patroller’s Handbook Online is filled with useful resources for Plant Patrollers, including updated forms and information.



Plant Identification

Quick Key

To Ruling Out Maine’s 11 Most Unwanted Invasive Aquatic Plants

Quick Keys are now in stock and available for purchase! 

The Quick Key is a convenient pocket sized guide to ruling out Maine’s eleven most unwanted invasive aquatic plants. Each quick key costs $1.50, and there is a 10 % bulk discount for orders with quantities of 100 or more. To order a guide, please contact

Maine Field Guide to Aquatic Phenomena

Identify aquatic plants and much more using the online interactive Maine Field Guide to Aquatic Phenomena.


Aquatic Species Identification CardsID Cards

Aquatic Species Identification Cards (a set of sixteen 3.5″ x 4.5″ full color, waterproof plastic plant ID cards) are now available from the LSM at $12.00 per set. To order, please contact

The cards feature photos and concise descriptions for the five invasive aquatic plant species known to be in Maine as well as twenty-four of Maine’s more common native aquatic plants. Cards are color coded (red for invasive, green for native) to help you tell the good plants from the bad. The set is bound by a binder ring and hung on a carabiner, so you can hook them to your belt-loop or swimsuit strap and go! The set can also be easily expanded as new cards become available.

Please note: This set currently only includes five of the eleven plants on Maine’s prohibited list.


Maine Field Guide to Invasive Aquatic Plants
and their common native look alikes

The Field Guide focuses on the eleven invasive aquatic plants currently listed by Maine law as imminent threats to Maine waters. Also featured are many native aquatic plants commonly confused with these eleven invasive species.

Photographs, illustrations and narrative descriptions are presented for each of the featured species, along with a variety of cross-reference tools for easy comparison of similar species.

This 160-page reference–spiral bound and printed on tear-resistant waterproof paper–is built to hold up well to conditions in the field (including inclement weather and the occasional dunking).

Free Field Guides for LSM Monitors: One complimentary copy per volunteer.

Ordering info: Field Guides are available for $35.  Please contact or call (207) 783-7733. Please write “Field Guide Order” in the subject line of your email.  Additional Shipping & Handling charges will be determined based on quantity ordered.

Previous Edition Field Guide Errata: Field Guide Errata.

Please help support LSM’s free online resources and publications by making a gift now.

Plant Identification Pages – used by Courtesy Boat Inspectors

Click here for these helpful pages on plant identification; they show the “11 most unwanted” invasives, and common look-alikes

References for Aquatic Plant Identification

Click here for a list of resources for aquatic plant identification, including books, academic journals, and helpful websites!

Screening Survey

Survey Equipment

Screening Survey Information & Resources

Citizens’ Guide to Invasive Aquatic Plant Management

Once an infestation has been confirmed, rabid MMI Guide Coverresponse is crucial. The prospects for effective management or even eradication is greatly increased by swift, well-planned, and properly executed controls. The purpose of the Maine Citizens’ Guide to Invasive Aquatic Plant Management is to provide the information necessary to effectively manage invasive aquatic plant (IAP) populations, to prepare for such an eventuality, and to address all associated activities. Methods described in this Guide are based upon tested best management practices for controlling aquatic plants effectively and in a manner that protects wildlife and habitat.

Friend or Foe? Learning Kit

Preventing the spread of invasive aquatic plants through education and boat inspections is essential to protecting Maine’s water resources. But 100% effectiveness is unlikely no matter how comprehensive the prevention effort. At some point, an invader is bound to slip through the cracks. It is very important for people who enjoy Maine’s lakes, ponds and rivers to learn how to recognize a suspicious plant when they see it, and know exactly what steps to take when they do. The LSM is pleased to offer this educational tool that teaches exactly that!

The Friend or Foe? Learning Kit has been designed to provide a quick, easy, hands-on method for teaching people with no previous plant identification experience how to quickly determine if a plant in question is a “friendly native” or a “suspected invader.” The Kit contains a collection of several true-to-form plastic plants (some representing invasive species, others, harmless natives), a set of 25 Quick Keys to Ruling Out Maine’s Eleven Most Unwanted Invasive Aquatic Plants, a self-guided practice sheet (that may be reproduced for students, or simply used by the instructor to guide the activity), and a host of other resource materials, including an instructor’s guide with background information and additional, hands-on invasive species lesson plans. At the conclusion of the exercise, it is recommended that participants keep their Key. (The handy, waterproof, pocket-folded keys may be re-ordered at low cost from LSM.)

If you are interested in purchasing this kit, please contact the LSM at or 207-783-7733.


Invasive Aquatic Species Maps

Interactive Map of Known Invasive Aquatic Plant Infestations (source: Maine DEP)

View larger map

Signs and Posters


sign for boat launches.
11UnwantedPoster Maine’s Eleven Most Unwanted Poster
Invasives Map Icon Maine DEP Map of Known Locations of Invasive Plant Infestations Invasives Map Icon Do Not Pick Up Hitchhikers sign for boat launches

Invasive Aquatic Species Links

Contact information

Contact us at:     Phone: 207-783-7733       Email:

Hours of visitation at LSM Office:
  Mondays 9:00am - 3:00pm         Wednesdays 9:00am - 3:00pm
  Thursdays 11:00am - 3:00pm       Or by appointment

Our Mission

Lake Stewards of Maine (LSM) works to protect Maine lakes and to promote lake stewardship through widespread citizen participation in the gathering and dissemination of credible scientific information pertaining to lake health.


LSM is a non-profit 501(c)(3) organization committed to the collection of information pertaining to lake water quality. For 50 years, trained volunteers throughout Maine have donated their time so that we may all learn more about one of Maine’s most beautiful and important resources — our lakes.