I planted a couple dozen seeds of Bloodroot, Sanguinaria canadensis, two years ago, and I'm starting to see them germinate. It's an ephemeral who's seeds are normally distributed by ants. That means it's pretty, but also takes the better half of a decade to reach a flowering age. I believe the delayed germination gives the ants a chance to relocate their nest and it would be interesting to map how often colonies of likely seed distributing ants move their nests. I know Aphaenogaster species appear to be best at it and I know they often relocate ever few years.
Here is Tall Bellflower, Campanulastrum americanumas, as it looked in late winter. This little rosette of leaves was just a seed I'd planted around this time last year.