I noticed this last year and thought it was a coincidence but it happened again. Early this afternoon I sprayed broadleaf weed killer on about 200 dandelions in my front yard. None of them had seed heads, just the yellow flowers. I went out about 2 hours after spraying and in that short period of time over half of them had headed-out and were sporting puff balls. It's like they knew they had been poisoned so they quickly in a last act of defiance readied themselves to distribute millions of seeds across my yard. It's a constant battle -I always put down pre emergence by the book but some years it just doesn't work.

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