Answer:Sunflowers are maturing their seeds and what you see happening with the plant may be perfectly normal. In general, sunflowers need deep roots in order to hold up the tall stalks and heavy flower heads. If your soils is hard and compacted, or if you water lightly instead of deeply, the roots will remain close to the surface of the plant rather than growing deeply and as a result the stalks will begin to topple over under the weight of the flowerheads. Before planting next year, amend the soil with organic matter to loosen it and help it hold moisture and after planting water deeply every 4-5 days to encourage deep roots. Hope this helps your next crop of sunflowers!
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