Often dismissed as 'weeds' these 'non-crop plants', as they were described, can instead be understood as messengers, offering clues about drainage, fertility, disturbance and more. Rushes, for example, often point to wet soils, while poppies can indicate recent disturbance. Others, like dock, can signal multiple conditions. 

Rather than focusing on and dealing with individual species in isolation, Chris suggested that we look at the plant communities that exist in our fields. While each plant does indeed reflect certain conditions, it’s where the overlap exists between several species that the clearest signal as to the true soil condition can be deduced. He emphasised the fact that whatever we might call them, they need to be considered differently depending on whether they are found in an arable or livestock system.

This way of observing offers an accessible complement to lab testing. More importantly, it builds ecological literacy, supporting farmers and growers to become active interpreters of their land. By understanding what plants are telling us about our soil (fertility, structure, acidity, etc) and what they are doing to it (aerating, decompacting, fertilising) we can make better decisions about soil health and even redesign systems with more beneficial species in mind.

The process itself is very straightforward and begins with observation: What’s growing? What patterns are there across a field? How does what you’re seeing compare with the results of any soil tests? While not exact, it is a powerful, free tool for reconnecting with the living systems beneath our feet.

Plant bioindicators remind us that the land is always communicating. We just need to learn how to listen. 

Download the full webinar notes here.

For a more in depth  practical field guide click the button below.