I spent an hour this morning digging in the front garden. Fat worms curled in every spade full happy to return to their  freshly turned home and afterwards I felt a sense of contentment as I surveyed my weed free plot. My feel good mood may not have been simply due to the fact the garden looked better but also because of microbes in the soil. Scientists have discovered that certain microorganisms living in healthy soil stimulate the central cortex of the brain known as the pleasure and relaxation zone. It is the same area that prozac and other anti-depressants target. So a couple of hours gardening isn’t just food for your soil but can make you feel happier. Definitely a good excuse to get outside and start digging.