Food Safety Focus (243rd Issue, October 2026) – Article 3

Beware of Wild Taro and Cook Edible Taro Properly to Reduce Risk

Food poisoning cases occasionally occur when wild taro is mistakenly picked or sold. Wild taro contains high concentrations of needle-like calcium oxalate crystals, which can penetrate mucous membranes, causing burning and swelling of the mouth. Because normal soaking or cooking cannot effectively reduce this high crystal load, one should never pick and consume any taro-like plants.

As for the edible taro plant, while consuming its leaves and stalks is less common in Hong Kong, they are popular in other regions. Although edible taro contains far lower levels of crystals, its leaves and stalks still pose an irritation risk. Literature shows that traditional preparation methods, such as peeling, cutting, soaking, salting, fermenting, boiling and discarding the water, and cooking thoroughly, help reduce such irritation. These steps wash out oxalates and blunt the crystals, but they do not work on wild taro because its crystal load is simply too high.

To prevent poisoning, never pick wild plants and buy food only from reliable suppliers. Vendors must ensure they sell only edible species and never wrap produce in wild taro leaves.