Do giant sunflowers grow back every year, or do you have to keep planting them (year after year)?
Question:
Answers:
In most cases they do not. It depends where you live and if
you take the flowers off the plant. The sunflower is of the
genus helanthus, It is an annual which only lives one season.
At times the seeds that fall will germinate the next year.
keep planting them.
You need to replant them year by year.
Very few varieties are perennials. Best to germinate them (in a wet paper towell etc etc) before planting.
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