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Harvesting sunflowersIf you have an annual sunflower with a single flower on top, then once you harvest the seeds, it's OK to cut the stalk down to the base or remove it completely. If you have an annual sunflower with multiple flowers, you can harvest each flower as the seeds become ripe, but leave the other flowers to complete their ripening. After all flowers have been harvested, you can cut the plant down to the base or remove it completely. Annuals will only grow for one season, so you will need to plant more seeds in spring. If you have a perennial sunflower, with multiple flowers, harvest each flower as its seeds become mature. Once all of the flowers have been harvested, wait until the foliage has died in late autumn before cutting the plant back to the ground (keep roots intact); the perennial will start new growth next spring.

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