Hi Judy, We have loads of snowdrops naturalized here right along the Bronx River in Tuckahoe NY. Some are already out, including those which were clearly in an area where the river overflowed during the recent flooding. I suspect they started upstream, probably from garden trash many years ago, and have seeded downstream ever since. There is also a large colony on the other side of the parkway, away from the river, probably also started as throwaways from nearby houses. It must be ridiculously old. This is one "invasive" I truly enjoy, they do not bother neighboring vegetation and are soon gone anyway. Seems to be an example of a naturalized plant that plays well with others. The biggest threat to them comes from another, really bad, invasive, Ranunculus ficaria, which gains ground locally every year. Another naturalized bulb, which will appear later and is found somewhat deeper in the local woods,is Scilla siberica. Ernie DeMarie Tuckahoe NY Z6/7