I'm that guy on our street. The guy with the front yard garden that's hanging over the sidewalk. Passers-by have to do the limbo to avoid being scratched by the overhanging sunflowers.
I don't know what possessed me this spring. I was sowing annual seeds in the front yard in May and I thought, "Oh, sunflowers would be nice here until the zinnias take over." I was thinking demure 4' sunflowers with a single head, for some reason.
What I got where 8' multi-branched monsters. The edge of the front garden is lined with them like some sort of living fence, alive with bees and goldfinches.
Slightly embarrassed by their size and vigor, I keep waiting for them to finish so that I can pull them out.
They have other plans, and keep budding up on side shoots. I think that they're in for the long haul.