Invasive plants have been called a major threat to the biodiversity of our environment, second only to habitat loss. This issue is a complex one with almost as many different opinions as there are plants. Most plants are not invasive; we need to deal with the few that are!
First, let's define what an invasive plant is. According to the ANLA (American Nursery and Landscape Association), invasive plants are plants that have, or are likely to, spread into native plant communities and cause environmental harm by developing self-sustaining populations and disrupting those systems. Invasive plants generally originate from sources outside the United States and have no naturally occurring pests here to keep them in check. The invasive plant issue is occurring all across the United States as well as in other countries!
We believe that education of both the general public and the industry is the most responsible solution to this challenge. We make a step in that direction by identifying plants we grow that may be considered invasive in some areas and suggest alternative plants to be considered. We support education about invasive plants and promote the role that beneficial plants, both native and exotic, play in preserving our environment. Beneficial plants are those which require minimal maintenance - such as water, fertilizer or pesticides - because they're well adapted to local climate and soil types. Less fertilizer and pesticides mean reduced polluted rainwater runoff. Beneficial species provide food and habitat for desirable wildlife, and have a proven history of non-invasiveness. We also support the Codes of Conduct set forth in the Saint Louis Declaration, a document produced through the joint efforts of numerous horticultural and environmental organizations. (www.fleppc.org/FNGA/St.Louis.htm)
We do not believe banning plants is an effective solution to this problem. Plants are being banned based on opinion without scientific research. The recent research on Berberis thunbergii Concorde, by Longwood Gardens, provided proof of its non-invasiveness although some states had already banned all Berberis thunbergii without having done any complete research! Several states have taken a step forward by establishing an evaluation process to put plants through before deciding if they get the invasive label. The use of such scientific protocol needs to be in place for all states. ANLA has proposed that the evaluation criteria developed by the Massachusetts Invasive Plant Working Group serve as a national model. We support this as long as plant variety or cultivar differences are accounted for.
There has also been an idea put forth to tax invasive plants. This only provides the opportunity for more government and an increased burden on businesses. Also, it does not solve the problem.
By combining education about invasive plants and promotion of beneficial plants, nursery growers, garden centers and homeowners can work together to play a key role in the conservation and preservation of our environment.
Here is a list of online resources available to learn more about the invasive species issue. We do not necessarily endorse the content of these websites or share the opinions provided. We present this alternative reading material for educational purposes.
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