'Cheap plants are like cheap food, you get what you pay for': meet the new generation of independent nursery owners / Their grandfather came to America and opened a nursery. A century later, it's closing / 'NHS nursery closure could mean I can't do my job' / 'I'm desperately trying to save my nursery' / Nursery closures 'punishment' for choosing rural life / Revealed: the bumper profits taken by English private nursery chains