In the backyard of the family home, there are two barrels of yogurt and milk powder. This mixture can be sprinkled on the wugus leaves as organic fertilizer. "Not only does this provide nutrition to the wugus, it is also eaten by the insects that prey on the wugus, so that they don't suck out the sap," notes Cheng.
黃家後院裡兩桶由過期嬰兒奶粉、養樂多等培養的有益微生物，是要灑在山蘇葉面上的有機添加物，「不但可以供給山蘇營養，還可以讓山蘇的敵人紅蜘蛛和介殼蟲吃，就不去吸取山蘇的葉汁」，鄭書杏說。