Arrowhead

Let’s talk about arrowhead, Sagittaria sagittifolia (pics). Native to these Isles. Member of the Alismataceae family.

You’ve probably never heard of it. Most of us haven’t. Yet for thousands of years, entire communities across China and Southeast Asia have been thriving on this plant.

Building food systems around it. Using it as both sustenance and medicine.

Walk beside any pond, canal or slow river in Britain and you might see it. Arrow-shaped leaves poking through shallow water.

Beneath the mud, fat tubers are storing energy. Starch, protein, minerals, polysaccharides that can strengthen your immune system.

We call it arrowhead. The Chinese have been calling it dinner.

Here’s what traditional cultures worked out long ago. Harvest the tubers in late autumn when they’re plump with stored energy.

Boil them for 20 minutes, with a change of water half way through the cooking to mellow that raw bitterness.

What emerges is something halfway between a potato and a water chestnut, with a distinctive nutty sweetness and firm, yielding texture.

Collect young shoots in spring. Peel them. Braise them with soy sauce, sugar, and aromatics and you have a half decent wild vegetable.

In Traditional Chinese Medicine, arrowhead occupies that brilliant space where food and medicine blur together.

It’s considered a tonic, something that builds vitality over time. Not a quick fix. Just consistent nourishing support for your health.

Throughout Southeast Asia, in places like Manipur, people have integrated this plant so completely into their food systems that eating it is simply… normal.

And you know what? Modern science is backing this up. Studies by Gu and colleagues in 2020 confirm that polysaccharides extracted from arrowhead have powerful antioxidant properties. They neutralise free radicals. They stimulate immune cell activity.

Recent work by Feng and team in 2021 explored selenium-modified arrowhead polysaccharides, showing enhanced antioxidant and potential anti-cancer properties. This isn’t speculation. This is laboratory research validating what traditional practitioners observed through centuries of use.

The nutritional profile is genuinely impressive. Complex carbohydrates that provide sustained energy. Significant protein content, unusual for a starchy vegetable. Fibre. Phosphorus and potassium.

All wrapped up in a package that grows wild in environments we often consider wasteland.

So why have we ignored this? Partly, it’s cultural blindness.

Western foraging traditions focus on terrestrial plants. Berries from hedgerows. Leaves from woodland edges. We’ve largely ignored aquatic vegetables, missing an entire category of wild foods that East Asian cultures have mastered.

And partly, it’s unfamiliarity. The tubers require proper preparation. That’s more work than grabbing a potato from the supermarket.

But the reward? Access to nutrition that’s sustained communities for millennia.

Compounds that actively support your health. And a challenge to your assumptions about what counts as food and whose knowledge matters.

Right now, today, you can walk into a Chinese grocery in most major cities and buy fresh arrowhead tubers. They’re sitting there, waiting for people who know what to do with them.

Better yet, you can learn to identify it, gather it and feed your family.

Food scientists are even extracting arrowhead polysaccharides as functional food additives, blending the starch with other aquatic vegetables to create novel applications.

But here’s my question. Why extract and isolate when you can just cook and eat the whole food?

Sometimes the old ways are the best ways.

References

Ahmed, M., Ji, M., Sikandar, A., Iram, A., Qin, P., Zhu, H., Javeed, A., Shafi, J., Iqbal, Z., Iqbal, M., & Sun, Z. (2019). Phytochemical Analysis, Biochemical and Mineral Composition and GC-MS Profiling of Methanolic Extract of Chinese Arrowhead Sagittaria trifolia L. from Northeast China. Molecules, 24(17), 3025.

Feng, Y., Qiu, Y., Duan, Y., He, Y., Xiang, H., Sun, W., Zhang, H., & Ma, H. (2021). Characterization, antioxidant, antineoplastic and immune activities of selenium modified Sagittaria sagittifolia L. polysaccharides. Food Research International, 153, 110913.

Gu, J., Zhang, H., Wen, C., Zhang, J., He, Y., Ma, H., & Duan, Y. (2020). Purification, characterization, antioxidant and immunological activity of polysaccharide from Sagittaria sagittifolia L. Food Research International, 136, 109345.

Gu, J., Zhang, H., Yao, H., Zhou, J., Duan, Y., & Ma, H. (2020). Comparison of characterization, antioxidant and immunological activities of three polysaccharides from Sagittaria sagittifolia L. Carbohydrate Polymers, 235, 115939.

Li-Cha, Z. (2014). Gel Characteristics of Starch Blends from Sagittaria sagittifolia, Eleocharis dulcis and Trapa natans. Modern Food Science and Technology.

Sun, Y., Liu, Y., Li, J., & Yan, S. (2023). Acetic Acid Immersion Alleviates the Softening of Cooked Sagittaria sagittifolia L. Slices by Affecting Cell Wall Polysaccharides. Foods, 12(3), 506.