WANDERING round an achingly cool San Francisco espresso store just a few years in the past, I used to be fascinated to see big, open-topped barrels stuffed with used espresso grounds and an indication saying they had been free for purchasers to scoop into recycled luggage and take dwelling to perk up their vegetation. I realised that we had reached peak hipster.
Certainly, the declare that espresso waste dramatically boosts plant development has been a staple of natural gardening books since not less than the Nineteen Seventies, and appears to be seeing a contemporary renaissance. Proponents in all places wax lyrical about how the spent grounds are usually not solely wealthy …