The mature period of walnut will change due to different varieties and climate differences. There are some early varieties and late varieties whose mature period can differ by 10 to 25 days. Generally, the mature period of northern region is mostly from the first ten days to the middle ten days of September, while that of southern region is relatively earlier.
When walnuts are picked from August 25 to September 1, they will be yellowish brown or light brown. At this time, their taste will be fragrant, but a little astringent. If they are picked after September 1, they will be white and yellow, with the smell of oil and crisp. If they are picked later, their maturity will be very high, and the green skin will crack itself. At this time, it will be easy to remove the green skin. The peeled fruit surface is clean and beautiful.
