I've had some wild violet V. sororia (striped) in my yard for years, but the 2nd-year-bloom rule was demonstrated for me this year by Sandy. For some reason, almost all my blooming-size violets were killed off, but this spring seedlings came up everywhere. I'll be looking forward to violets this coming May.
(Same for a lot of other perennials: my blooming-age plants were killed, but seedlings came up in droves. Aquilegia, for example.)