There's a new food we are all likely to hear a lot more about in the future. Developed from wheatgrass, 'Kernza' is being hailed as a weapon against climate change that could also protect the environment and revolutionize farming. Big claims for a grain that is but one-fifth the size of wheat.

Americans can already buy pasta, pizza, bread and beer made with the grain, which was trademarked 'Kernza' by the Land Institute in Kansas. Last month, US food giant General Mills launched a breakfast cereal made from it. General Mills has also given the plant-breeding team behind Kernza half a million dollars to bring it to full commercial production.

Worldwide production of grain in 2018/19, by type (in million metric tons) Image: Statista

People who have tried Kernza say it tastes good. But the grain has a much more serious purpose. Unlike wheat, barley and other cereals it is a perennial plant whose roots can be left in the ground to regrow after harvesting.

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Sustainable growth

Kernza roots extend over 3 metres beneath the soil, more than twice the depth of wheat, helping to stabilise soil, retain water and improve wildlife habitat. The first product to be made commercially from the grain was a beer named Long Root Pale Ale.

How Kernza roots measure up to wheat. Image: The Land Institute

Kernza is also good at trapping carbon in its roots. Fred Iutzi, president of the Land Institute, which developed the grain, describes it as being like a pump that takes carbon out of the atmosphere and stores it in the soil. It also traps nitrogen, preventing it from reaching streams and rivers.

Bigger and better varieties

In order to make Kernza more attractive to farmers and food producers, Iutzi and his team plan to create new strains of the grain, with higher yields. Currently, Kernza grains are a lot smaller than wheat, but the Kansas team believe they can create varieties with much larger seeds.Developed from what is commonly known as intermediate wheatgrass (Latin name thinopyrum intermedium), Kernza has a long time has been used in animal feed. It's suited to cooler climates such as that found in the prairie lands in the north of the United States.

It could be another 10 years before Kernza-based products are widely available in supermarkets. But things are progressing fast. The Land Institute is working on a dwarf variety of the grain that promises improved bread-baking qualities. And Kernza beer is on sale at the Blue Skye Brewery in the town of Salinas, Kansas.

Kernza has been used to brew beer. Image: Blue Skye Brewery