Over the past couple of years, I’ve been planting up much of the pasture on our small Cornish farm with native hardwood trees, mainly oak. I now know I needn’t have bothered. As soon as the grass stops being cut, little oaks spring up of their own accord. This last dry summer in particular has seen dozens appear, tiny three-leaved stalks that push through the sward with their multi-layered greens beautifully tinged with reddish anthocyanin.