Do people eat a soap tree yucca?

Yes, people do eat the soap tree yucca, also known as Yucca elata. The roots, which are rich in starch, can be cooked and consumed similarly to potatoes. Additionally, the flowers and young shoots are edible and can be used in salads or cooked dishes. However, care should be taken in preparation, as some parts may contain saponins, which can be toxic if not properly processed.