Kolmishak

Lore & Background

Ipomoea aquatica, known as kolmishak in some contexts, is generally believed to have been first domesticated in Southeast Asia. Its origin is not quite clear, but phylogenetic studies, ideal climatic conditions, and the number of native pathogens in the region support a Southeast Asian origin. Some sources cite China or India, but these claims lack supporting evidence beyond historical name appearances; the first clear Chinese mention, in the Nanfang Caomu Zhuang (AD 263–307), identifies it as a foreign vegetable from 'western countries.'

Reader's Guide

Kolmishak (Ipomoea aquatica) is a significant vegetable in East, South, and Southeast Asian cuisines, used in dishes such as stir-fries, salads, and curries. It is also used in traditional medicine in Southeast Asia and parts of Africa, for conditions including piles, nosebleeds, high blood pressure, and jaundice. The plant has potential as a phytoremediation agent, removing nutrients from wastewater, but it can accumulate heavy metals like cadmium, lead, and mercury, posing health risks if grown in polluted waters. Its edible parts have lower heavy metal concentrations, and removing stems and bottom portions can minimize intake. The plant is also fed to livestock as green fodder.

Did You Know?

• The hollow cavity within the stem makes the plant buoyant.
• It is an efficient accumulator of cadmium, lead, and mercury.
• Infections of the intestinal parasite Fasciolopsis buski in humans have been linked to water spinach in the Mekong regions.
• The first clear mention in Chinese records is in the Nanfang Caomu Zhuang (AD 263–307), where it is called 'a strange vegetable of the south.'