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Is it too late to thin out sunflowers after they begin to put on heads? I planted an acre of them but came up really small.

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1 Comment To "Sunflowers"

#1 Comment By Downtoearthdigs On 07/21/2016 @ 12:23 pm

Yes, you can thin your plants as young seedlings, then again at 12 inches and a last thinning can be done when the plants are 2 feet tall.
This will help you develop the largest heads for seeds.
You can cut the plant down if pulling will disturb the other plants roots.

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