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1. The maturation process of sunflowers is from the outside to the inside. When the sunflower disk takes on a convex shallow basin shape and the seeds in the center are basically full (it will never be completely full!), it can be harvested.
2. After the sunflower is pollinated and fertilized, the grains swell and the grain filling is gradually completed. The tongue-shaped flowers of the sunflower begin to wither and fall off, and the tubular flowers wither.
3. Sunflower enters the mature stage, and the top functional leaves turn yellow-green or yellow-brown. Performance varies depending on variety maturity and sowing date.
4. The flower disk shows the inclination that the variety should have (grade 1-5), the back of the flower disk is yellow to yellow-brown, and the color of the receptacle changes from green to yellow-green. Looseness and tightness (shattering) of the mouth vary depending on the characteristics of the variety.
5. When you touch the flower disk with your hands, the withered tubular flowers will fall off easily. The sunflower seeds are full and the outer seed coat is hard, showing the inherent color (black, white, gray, flower stripes) and luster of the seed coat. Gently pinch the seeds with your hands to prevent them from peeling off.
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