Comfrey flowers attract pollinators while the leaves can be used to make liquid feedThe more I hear about comfrey, the more fascinating it sounds. There is a native perennial comfrey (Symphytum officinale), a member of the borage family, but in this instance, we’re talking about Russian comfrey (Symphytum × uplandicum), a powerful herbaceous perennial superplant valued by gardeners and herbalists alike. Russian comfrey is a robust and vigorous plant that grows upright to about two metres and has a similar spread, with bristly, elliptic to lance-shaped, green leaves. It arguably excels greatest as a liquid feed – or so-called tea – which is high in potassium and packed with other key nutrients such as nitrogen and phosphorus. Like all the best liquid feeds it’ll stink like a rotting carcass but that means it’s all the more potent.