Snails of Summer part A

On a walk in a nearby wilderness park, I found lots and lots of snail shells halfway up dried anise stalks. All of the ones I examined were empty. The areas with snails seemed like they would be boggy when times are wet, but of course were dry at the end of August at the end of a very dry period. I guess the snails leave eggs behind buried in the moist soil to carry the population over to next year; maybe after that they climb the nearby stems in search of succulent food as the plants dry up.