"Can I import berries and grow White Mistletoe (Viscum album) in the USA?... "
All countries have laws imposing import restrictions on plant material which could potentially become a serious pest or introduce plant diseases affecting agricultural crops. I sent this question to the US Department of Agriculture and received this reply:-
... "All parasitic plants fall within the definition of a 'plant pest' and are regulated in the United States under the authority of the Plant Protection Act. Parasitic plant parts capable of propagation are prohibited entry into the US, unless they are accompanied by a plant pest permit, Plant Protection and Quarantine (PPQ) form 546. An importer would have to apply for this permit, but pest permits are usually issued only for research in containment facilities, or for other uses that do not pose a risk of the organism escaping into the environment. We would not issue a permit for intentional planting outside of containment."
Polly P. Lehtonen, Senior Staff Officer
USDA, APHIS, PPQ
Plant Health Programs
Permits, Registrations, Imports & Manuals (PRIM)
Commodity Import Analysis & Operation (CIAO)
4700 River Road Unit 133, Room 4C-01.27
Riverdale, MD 20737-1236
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See more US information at: www.aphis.usda.gov/ppq/permits/weeds/index.html
(Please note that the genus Viscum is listed as a parasitic plant under - How to Reply - 1.)