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CANNABOOST plant food is one of the best selling products at the Hydroexpress hydroponics store in Stirchley, a working-class part of Birmingham. The small shop, its windows filled with graffiti-style posters, also sells fertilisers with names like “Nirvana” and “Bud Candy”, alongside strong lights and giant rolls of tin foil to line greenhouses. In one corner, a couple of juicy-looking tomato plants grow in a demonstration set-up. But the...
