Ng Fat Chuen and his mother grew vegetable in Wong Tai Sin for years. They had accumulated many knowledges on agriculture. He thought that his mother was very competent. Although she never went to school, she knew how to farm by her instincts and understood the principle of “awns fall at Manzhong and water fills the field at Xiazhi” (i.e. it was not suitable to grow rice during rainy season). Her mother grew crops according to seasons. For example, the third and fourth months of the Lunar Calendar would be the season for planting water spinach, while the fifth month was suitable for cabbage. Ng's family once grew bok choy and brocolli. Three catties of bok choy only worth 10 cents. However, it was not vulnerable to insects. Brocolli was frequently attached by black worm. They could climb up to the soil’s surface and eat up a whole crop overnight. To curb the problem, Ng’s family used American-made insecticide.