A few years back, a friend of mine gave me TONS of blue cornflower seeds, a wildflower native to Colorado. Last season, I decided to plant a few seeds in my front yard to see what would happen. Only two sprouted up and were fairly small. Wildflowers are usually perennial, meaning they come back year after year. This season, they've come back in a big way, and are basically bushes at this point. They've taken over a large part of our front yard, and I'm wondering how big they'll get going forward.