For several years, measures have been taken to limit the worrying spread of pampas grass. In France, the decree of February 14, 2018 - amended in March 2020 and then in April 2024 - classifies Cortaderia selloana among the plant species whose possession, planting and transport are prohibited throughout the territory. This means that you can no longer keep it at home at the time of writing and that it is imperative that you destroy your stocks.
The risks incurred in the event of non-compliance with these regulations are set out in Articles L415-3 and R415-1 of the Environmental Code. Their content is very clear: it is forbidden to "voluntarily introduce into the natural environment, transport, peddle, use, offer for sale, sell or buy a specimen of an animal or plant species", under penalty of risking a penalty of up to 3 years imprisonment and a fine of €150,000.
How this will be enforced remains to be seen.
Chris