What is an invasive plant?
An invasive plant is one that is not native to a particular ecosystem, whose introduction does or is likely to cause economic or environmental harm or harm to human health. It is capable of moving aggressively into an area, monopolizing light, nutrients, water, and space to the detriment of native species.
Why should we care?
Many familiar plants in our gardens and fields, and along roadsides are not native to New Hampshire. While the majority cause no harm to natural habitat or managed farms and forests, some do and are considered invasive plants. Invasive plants can reduce biodiversity, imperil rare species, reduce wildlife habitat by eliminating native foods or changing cover or nest sites, degrade water quality, reduce forest and farm crop production, and cause human health problems.
NH Invasive Plants -- What is Prohibited?
The State of New Hampshire has 27 plant species on a prohibited list. Some of these are already widespread in our environment, such as burning bush, buckthorns, multiflora rose, bittersweet, and Japanese barberry. For all the plants on this list the rule states: No person shall collect, transport, import, export, move, buy, sell, distribute, propagate or transplant any living and viable portion of any plant species, which includes all of their cultivars and varieties. New Hampshire lists another 24 plant species as restricted. These plants are not yet prohibited, but are exhibiting many of the invasive plant characteristics. Some of these are also famiiar in our landscape including black locust and reed canary grass. The NH Department of Agriculture, Markets & Food regulates the plant industry including invasive species.
What can you do?
Other invasive plant websites and resources
- Coastal Watershed Invasive Plant Partnership (CWIPP)
- Forest Service
- Invasive Plant Atlas of New England (IPANE)
- Invasive Plants (Cornell University)
- NRCS Plant Database
- National Invasive Species Council
N.H. state agencies involved with invasive plants
- NH Department of Agriculture, Markets & Food--Division of Plant Industry
- NH Department of Agriculture, Markets & Food--Division of Pesticide Control
- NH Department of Transportation
- NH Division of Forest and Lands--Forest Health
- NH Department of Environmental Services- Exotic Aquatic Plants