What are heritage grains?
Heritage grains are varieties of wheat, rye, barley and oats that were grown before the introduction of intensive, scientific plant breeding in the early 1900s. Our ancestors grew genetically-diverse ‘landrace’ crops that were adapted to poor soils and difficult growing conditions.
These crops were much more resilient, reliable and adaptable than modern varieties, and had large root systems that allowed them to draw moisture and nutrients from deep below the soil surface. Wheat rarely cross-pollinates, and traditional landraces were complex mixtures of pure-breeding lines that were well-adapted to local growing conditions. Seed was resown from the previous year’s harvest which ensured crops were always in the process of adapting to local growing conditions and longer term climate change.
In the mid-19th century, plant breeders began to select and purify individual lines within these mixtures that yielded better in soils with higher levels of nitrogen derived from natural (eg. manure) or ‘artificial’ (eg. guano) sources. Only the most promising lines were retained and multiplied, and most of the diversity that once grew in farmers’ fields was lost.
Many of the heritage varieties that are becoming popular with artisan bakers are genetically narrow because they have been bulked up from samples that were ‘purified’ by plant breeders, or which lost their diversity accidentally while being maintained in gene banks over the past century. Thankfully, heritage lines from the UK and abroad can be mixed to create new ‘populations’ that, if sufficiently diverse, will gradually become dominated by the best adapted lines and thereby mimic the resilient landraces and variety mixtures that were grown by our ancestors.
Some growers and bakers use the term ‘heritage’ to refer to cereal varieties that were grown before the introduction of dwarf ‘Green Revolution’ wheat varieties in the 1960s , which triggered a massive expansion of industrial, agrichemical-fuelled grain production in developing countries around the world. This caused a further decline in crop genetic diversity, accentuated the already catastrophic collapse of biodiversity in farmers’ fields in the UK and abroad, and massively increased the carbon footprint of flour and bread.
We believe the terms ‘heritage’ and ‘diversity’ are linked historically and genetically, and that the introduction of hybridisation and pure line selection methods in the early 1900s provides the most logical date for discriminating between traditional heritage varieties (which may be genetically diverse), and modern hybrid varieties (which, because of how they are created, are always genetically uniform). The first commercially successful ‘Green Revolution’ dwarf wheat was introduced to the UK in the early 1980s.
Today, almost all of the grain used for baking, brewing and distilling is grown from a handful of modern hybrid varieties that perform poorly in organic and low input (ie. low fertility) systems. They have shallow roots which make them susceptible to drought, and because they are genetically uniform they lack resilience and cannot adapt to longer term climate change. They perform well only when grown intensively using massive quantities of artificial fertiliser, herbicides, fungicides and pesticides – which are poisoning our food, destroying biodiversity and warming the planet. Modern wheat fields are ecologically sterile grain factories designed to convert cheap oil into cheap grain, much of which is fed to animals.
There is a growing demand for ‘real’ bread that is more flavourful than mass-produced supermarket bread baked from ‘commodity’ grains. Consumers are also demanding bread that is more nutrient dense and less problematic for people with gluten intolerance or coeliac disease. The Heritage Grain Trust will support the efforts of growers who have created genuine heritage populations that grow well in low input conditions, and which produce grain well suited to artisan-style baking, brewing and distilling.
In diversity there is strength!