By Bugie206
County Londonderry,
United Kingdom 
If head falls off sunflower will it grow back
1 Jun, 2012
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If you mean the flowerhead's fallen off or been damaged, it should produce another one - some varieties produce multiple flowers anyway, others just one large one, but even those, if it hasn't been able to set seed, should throw out a replacement for one that's been aborted for some reason.
1 Jun, 2012