But stay with me - microbes, Microbacterium Vaccae, found in ordinary soil have been studied and the results show that they actually stimulate the human brain to produce more Serotonin, a natural calming hormone. Getting your hands dirty makes you calmer. Who knows? Maybe you can throw awake your Prozac just by growing your own vegies and herbs or even some colourful flowers/bushes.
If you live in an apartment, you don't have to miss out. Use whatever space you have. Make sure it's garden SOIL, not potting mix. You can buy it from nurseries and hardware stores.
The act of tending to a living thing is in itself soothing. It takes your mind off your troubles. Let the microbes in the soil take care of the rest! You can also find out about local community gardens and get involved that way.
You can read more here:
soil and depression