This stage starts when the yellow ray petals begin to open.
Tiny "disk flowers" in the center are pollinated to produce seeds. sunflower growth timeline
Sunflower development is divided into two primary phases: (root and leaf development) and Reproductive (flowering and seed production). The timeline described below assumes standard growing conditions (warm soil, adequate moisture, and full sun) and is based on the standardized growth scale developed by agronomists. This stage starts when the yellow ray petals begin to open