Your volunteer sunflowers reminded me of a photo I had been meaning to share of my own garden volunteers. When I returned from a trip in late June, my vegetable garden (indeed, my entire yard) had become a miniature maple grove. Other than the basil and tomato plants, everything else growing in this photo is a tiny maple tree. (Note the jury-rigged but so far effective anti-bunny fencing, too.) I murdered them by the thousands when I mowed the lawn.
Over the years, I have allowed one or two to shelter and grow strong in the raised garden beds (i.e., in the decent soil I have built above my native clay) for a year before transplanting elsewhere. Successive Arbor Day plantings by kids at the local elementary school had produced a respectable grove of them — before the parking lot was enlarged, alas. Still, a 60-footer remains in the court median in front of my house. The satellite shot shows its form via its shadow. Imagine what our lawns would look like if we did not murder these eager and vigorous multitudes regularly.