To prevent the plants from absorbing too much water and sunshine, they are usually cultivated in greenhouses. Because Yeh lacked the necessary capital, he had to protect his plants with transparent plastic sheeting.
例如為了阻擋不必要的水份及使陽光直接照射，國外培養仙人掌多採用玻璃屋溫室栽培的方法，但在國內，因為花費大，成本高，早期一般都使用塑膠玻璃紙覆蓋在仙人掌上，如此一來，便宜是便宜了，卻耗時耗力，因為塑膠玻璃紙容易破損，保持時間不長，得不厭其煩的更換。