The "Luju" in Su Shi's famous poem "The Four Seasons of Spring Under Luofu Mountain" refers to grapefruit.

Expand knowledge:

1. Source: The names of fruits often appear in Su Shi's poems, such as Shu persimmon mentioned in "Red Cliff Ode" and "Dongli Yuefu". The watermelon arrived and so on. In "The Four Seasons of Spring Under Luofu Mountain", Su Shi wrote about fruits such as oranges, bayberries and grapefruits.

2. Lu orange: Lu orange is a citrus fruit. It is relatively small in size but has a very sweet taste and is very popular among people. The origin of the name Lu orange is said to be because the Lu family of Marco Polo Bridge planted this fruit; another is said to be because the Lu family planted this orange in the Ming Dynasty.

3. Lu Ju: The "Lu Ju" mentioned by Su Shi refers to grapefruit. Pomelo and tangerine are not the same fruit. Pomelo, also known as Wendan, has a slightly conical appearance, thick and granular skin, and fragrant and sweet flesh.

4. Birds of a feather flock together: Su Shi described the scenes of oranges, bayberries and grapefruits in his poem. The three fruits are not completely unrelated. They are all fruits, have sweet and delicious qualities, and grow during the spring and summer seasons.

5. Expansion: Su Shi is one of the important figures in the history of ancient Chinese literature. His poems have been widely circulated in history. They are not only remembered by future generations, but also praised by many people. The poem "The Four Seasons of Spring Under Luofu Mountain" has a beautiful artistic conception, describing the scenery of spring and summer and the taste of food, highlighting the unique charm of Chinese culture.

Su Shi (1037-1101), also known as Zizhan and Hezhong, was also known as Tieguan Taoist and Dongpo layman. He was known as Su Dongpo and Su Xian in the world. Su Shi is a Han nationality, a native of Meishan, Meizhou (now part of Meishan City, Sichuan Province), and his ancestral home is Luancheng, Hebei Province. He was a writer, calligrapher and painter in the Northern Song Dynasty. His father is Su Xun and his younger brother is Su Zhe. The father and son are collectively known as "Three Su".

Su Shi passed the same subject as his younger brother Su Che in 1057. In 1061, he took the imperial examination and entered the third class, except for being a judge in Dali and a judge in Fengxiang Prefecture. In the first month of 1065, he returned to the court and was sentenced to Wenguyuan. In February, he was summoned to examine the Secret Pavilion and Zhishi Hall. The following year, Su Xun died and returned to Shu to mourn. In 1069, he returned to the dynasty and served as the Chengzhong Cheng, Zhishi Guan, and Magistrate Suiyuan. In 1071, due to political disagreements with Wang Anshi, he went to Hangzhou to judge, and then Zhimi, Xu, and Huzhou.