Nashua, NH Landscaping Rules: Weed Ordinances (2026)

Nashua's local code handles weed control as a nuisance and property maintenance matter rather than via a published species list. Complaints to Nashua Code Enforcement trigger written-notice abatement and, if needed, City abatement at the owner's cost. The dominant species regulation is at the state level: NH Agr 3800 (the Invasive Species Rule) implements RSA 430:53 and lists species such as Japanese barberry, Norway maple, burning bush, autumn olive, multiflora rose, oriental bittersweet, purple loosestrife, glossy buckthorn, common buckthorn, and reed canary grass as prohibited invasive plant species. RSA 430:53, II makes it unlawful for any person to collect, transport, import, export, move, buy, sell, distribute, propagate, or transplant any listed prohibited invasive plant species in New Hampshire. The NH Department of Agriculture, Markets & Food administers and enforces the program. Within Chapter 190 Article XXVII, the City requires landscape plans to use plants hardy for the Nashua botanical zone and to maintain required landscape material in a healthy condition. Site plans are reviewed by the Planning Department and, where wetlands or buffers are involved, the Conservation Commission. Apiary, agricultural, and timber operations are treated under separate state rules and NH RSA 432.