Invasive Plants

It is illegal in New Hampshire to collect, transport, sell, distribute, propagate or transplant any living or viable portion of any listed prohibited invasive plant species including all of their cultivars, varieties, and specified hybrids.

Many of the invasive pests that are introduced as a result of escaping from a managed environment occur among landscape plants. Initially planted in yards because of their attractive appearance and low-maintenance, these plants can quickly overrun and dominate natural environments, where they out compete native plants. This is why some formerly popular landscaping plants (purple loosestrife, burning bush, Norway maple) are on the list of prohibited invasive plants in New Hampshire.

• New Hampshire Invasive Species Program
  • New Hampshire Invasive Species Strategic Plan
  • Grants & Funding Sources for Invasive Species Control
  • Invasive Species Frequently Asked Questions
  • Invasive Trees, Shrubs, Vines, and Herbaceous Plants
  • Prohibited Invasive Species
  • New Hampshire Comprehensive Invasive Plant List
  • Alternative Plants for Prohibited Species

• Invasive Species Booklet and Poster
  • New Hampshire Guide to Upland Invasive Species
  • NH Prohibited Invasive Upland Plants Poster
• Invasive Species Control
  • Glossy Buckthorn Herbicide Experiment Summary
  • Japanese Knotweed BMP Manual
  • Herbicide-Free Japanese Knotweed Control – A Case Study Matt Tarr, UNH Cooperative Extension Wildlife Specialist
  • Japanese Knotweed Control Quick Guide
  • Integrated Pest Management (IPM) for Woody Plants
  • Control of Invasive Species by Numbers
  • Invasive Plant Control Project (IPCP) Yearly Reports
    • 2012 IPCP Yearly Report
    • 2013 IPCP Yearly Report
    • 2014 IPCP Yearly Report
    • 2015 IPCP Yearly Report
    • 2016 IPCP Yearly Report
• Purple Loosestrife Biological Control Program
  • Frequently Asked Questions about the Purple loosestrife leaf-eating beetles
  • 2003 Annual Report(the last required report for the project)
  • Biocontrol Release Map for 1996-2005
  • Leaf-eating Beetle Feeding Damage Assessment Key
• Grants & Funding Sources for Invasive Species Control

• Links
  • Connecticut River Watershed Council
  • Invasive Exotic Species of North America
  • Invasive Species Mapping
    • EDDMapS
    • I-MapInvasives
  • NH Fish & Game Department - Picking our Battles: Enhancing Success of Invasive Plant Control Projects
  • Silvio O. Conte National Fish & Wildlife Refuge
  • Stewardship Network of New England
  • Upper CT River CISMA
  • Vermont Invasives

Any questions regarding this information may be directed to Doug Cygan at (603) 271-3488 or email douglas.cygan@agr.nh.gov.