“What you’ve got there from the sun on your face is a massive boost of serotonin!” says Alison Greenwood, founder of Dose of Nature, the charity successfully prescribing time outside as a treatment for mental health.
Greenwood is striding round Pensford Field, a tiny patch of wildness tucked behind houses in south-west London. The bright day is illuminating the early blackthorn blossom, gleaming off the pond where a heron watches tiny froglets and shadows of birch trees on a wood-chip path. “All these trees and plants are giving off phytoncides, and they’re good for your immune system too,” the former NHS psychologist says.
