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I agree with Lesley about leaving pots of seeds outside until germination. i would add, though, that I cover the pots - or more conveniently- a whole trayful of pots with horticultural fleece, securely tied round the sides of the tray to keep it in place. This has several advantages: it keeps out hungry mice, voles, blackbirds; it also keeps unwanted weed seeds, dead leaves, liverwort spores, etc from landing in the pots; and it keeps the atmosphere in the pot nice and moist. The two disadvantages are that small slugs can enjoy snacking on my seedlings before I have noticed them and also it's a nuisance untying the fleece every time I want to check the seeds. I think on the whole that it is worth doing, especially for seeds which you know will take several months or even years to germinate. So it's useful for trillium seeds, or for eranthis, sown fresh in May and not inspected till the next January at the earliest.