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Any time now pretty much. I have already seen other species which grow along side them in my back garden and its wet and cold so get out and have a look. Make sure you pick the right ones http://upload.wikimedia.org/wikipedia/commons/f/f4/Psilocybe.semilanceata.Alan.jpg check this link showing the british variety they will be at higher altitudes this early on grassy fields with sheep horses or cows.