1. Climate & Natural Phenomena
Guyu (Grain Rain) is the 6th solar term, occurring around April 19 to 21. It marks the grand finale of spring. The name comes from the ancient saying “Rain brings the growth of the hundred grains (雨生百谷)”, indicating that rainfall becomes significantly warmer and heavier, perfectly timed to nourish sprouting seedlings.
Ancient Chinese phenology divided Grain Rain into three distinctive micro-seasons (Penthads / 三候):
萍始生 Duckweed begins to flourish and spread across ponds and quiet streams.
鸣鸠拂其羽 Cuckoos flap their feathers and call out, alerting farmers to tend their fields.
戴胜降于桑 Hoopoe birds land among mulberry trees, signaling the prime season for silkworm raising.
2. Lifestyle, Diet & Customs
As spring transitions toward summer, ambient humidity rises sharply. Health customs focus on eliminating dampness and boosting vitality.
🍵 Diet & Health
Dietary advice during Guyu revolves around fragrant and naturally detoxifying herbs:
- Eating Chinese Toon (吃香椿): Fresh shoots of the Chinese toon tree are fried with eggs or tofu, offering an intense, nutty spring flavor.
- Guyu Tea (谷雨茶): Tea leaves picked on Grain Rain day are rich in vitamins and believed to clear body heat and ward off evil spirits.
- Red Bean and Barley Soup: Widely consumed to drain excess dampness from the body before early summer heat arrives.
🏮 Folk Traditions
In coastal fishing villages of northern China, Guyu is celebrated as the “Sea Sacrifice Festival” (渔民祭海). Fishermen perform ceremonies praying to the Sea God for safe voyages and abundant catches as the warmer fishing season officially begins.
📜 Classic Poetry
Poets cherished Grain Rain for its vibrant floral displays, especially the blooming of peony flowers, which are often called the “Grain Rain Flowers”:
《晚春》 — 韩愈 (Tang Dynasty)
草木知春不久归，百般红紫斗芳菲。
杨花榆荚无才思，惟解漫天作雪飞。
(Plants and trees know that spring will soon depart, so they display ten thousand shades of red and purple in competition. Even the poplar catkins and elm seeds, lacking fragrance, flurry through the sky like willow snow.)
3. Agricultural Wisdom
In rural farming communities, an old proverb states: “Rain on Guyu means fish will fill the river; a dry Guyu brings a tough year.”
This is the most critical agricultural juncture of spring. Adequate precipitation ensures that spring-sown crops root deeply, preparing the entire agricultural ecosystem for the onset of summer (Lixia).