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The best way is to test the seeds by taste and appearance. If the inside of the seed looks green or empty then it is not ripe. The seeds ripen from the outside of the head to the center. The petals will be shriveled, the head down-turned and yellow on the back. Sometimes the seeds - especially those in the middle - do not ever fill properly. When ripe, it is easier to rub the seed loose from the head. The seed color usually darkens also.

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Wiki User

16y ago
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Wiki User

12y ago

sunflowers are ripe when the center of the flower is a brownish-yellow color. and when the petals are not white anymore .

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Wiki User

11y ago

It begins to bloom.

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José Morales

Lvl 1
1y ago
Hi

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Q: How do you know when a sunflower is fully grown?
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