When do walnuts ripen? What are the strains of walnuts?

Walnut 9- 10 ripens, and the ripening time will depend on the local climate and walnut varieties. If the climate is relatively warm, walnuts will mature faster. Walnut strains are divided into northern walnut, Xinjiang walnut and Yunnan walnut by region, thin-skinned walnut, thick-skinned walnut and paper-skinned walnut by thickness, and summer walnut and autumn walnut by maturity.