Snowdrops aren’t native to the British Isles, though we don’t know when they were introduced. What we do know is they like growing here. Many streams and smaller rivers have snowy white banks at this time of year as the plant bursts into flower from bulbs moved along by flooding. You’re most likely to find Galanthus nivalis, which has grey-green leaves and green U-shaped marks on the inner petals, or its double variant, which looks like a crinoline dress. But another species that has naturalised fairly well, particularly in church yards, is G. elwesii. This has fatter strap-like grey leaves. Another species is G.woronowii, which you can easily identify by its apple-green foliage.