From Aug 23, 2026 to Aug 27, 2026, the corresponding solar term in the Nijūshi Sekki (24 solar terms) is 処暑(Shosho), and the corresponding microseason in the Shichijūni Kō (72 microseasons) is 綿柎開(Wata no hanashibe hiraku).

What Is “Wata no hanashibe hiraku” (綿柎開)?

"Wata no Hanashibe Hiraku" (綿柎開, "cotton bolls open") is one of the traditional Japanese seasonal markers known as the Shichijūni Kō (72 microseasons). It corresponds to the first microseason of Shosho (処暑) in the Nijūshi Sekki (24 solar terms) calendar and usually falls between around August 23 and August 27, signaling the gradual arrival of autumn. "Wata no hanashibe" (綿柎) refers to the calyx of the cotton plant. Around this time of year, the cotton fruits that bloomed with white or pale yellow flowers during summer begin to ripen and burst open, revealing soft white cotton fibers inside. The poetic expression "the flower calyx opens" beautifully captures this scene and became the origin of the microseason's name. The Shichijūni Kō (72 microseasons) divide each of the Nijūshi Sekki (24 solar terms) into three smaller periods of roughly five days each, expressing Japan's uniquely delicate awareness of seasonal change. Although originally based on a calendar system introduced from China, these seasonal markers were adapted over time to reflect Japan's own climate, landscapes, and changes in plants and wildlife. During the period of "Wata no Hanashibe Hiraku," the lingering summer heat still remains strong, yet hints of coolness can finally be felt in the mornings and evenings. The sight of white cotton fibers spreading from the ripened bolls symbolizes both the fading of summer and the beginning of the fruitful autumn season. By learning about this expression, we can gain a renewed appreciation for the Japanese sensibility of carefully observing the subtle shifts of nature and living in close harmony with the changing seasons.

List of Japan’s 72 Microseasons