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  This is foolish, the mess around Pistia
From: "Abrimaal Svartvinter" <abrimaal at o2.pl> on 2004.08.29 at 19:30:51(12095)
What? Cultivation of Pistia banned in Florida? In
Europe we have also many American diaphytes, which are invasive, but no one
fights them. For example Robinia pseudacacia (Fabaceae)
and a small garden pest Galinsoga parviflora (Asteraceae). In
Poland only cultivation of Papaver somniferum and
Cannabis sativa var. indica is banned, and Nicotiana
(tobacco) is controlled. Pistia is a World Conqueror, not a pest
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