This is the SECOND year in a row my snaps have come back. I've almost never in 40 plus years of gardening had snaps come back at all in Michigan, let alone 2 years in a row. And, actually, the winter of 2010-2011 was a harsher one than we had had for a while, but every time it was cold, we also had quite deep snow cover which insulated. And, of course, this past winter was the non-winter winter, and we only had one or two nights where temps fell below 10 degrees, basically it was a Zone 7b or Zone 8a winter.

So yes, I have a number of clumps of hale and hardy looking snaps coming back.

Not wierd or strange at all. Snaps are pretty cold tolerant and I have had them winter over in my zone 3 climate. The seeds too are cold tolerant and need to freeze to germinate well. The only thing is that they take a long time to come up and grow. They might like it cool to germinate but they like it a bit warmer to grow so they often sit there and grow slowly waiting for the soil to warm a bit. You may have noticed them more this year because of the warm weather we had.

I'll bet you've pulled some volunteers thinking they were weeds. The seed germinates with 2 leaves that have a slight point on the end. Take a good look at your seedlings and watch for them another year.