“The same roses we brought in from England, we’ve now had to bring in from Ireland to top them up and they’re 20% dearer,” Mercer said. “Prices are going up.” In the 80 years since Mercer’s grandfather founded the Hillmount Garden Center on the outskirts of Belfast, on Northern Ireland’s east coast, the business has never faced as many obstacles as it does now. The past year of lockdowns has seen a demand for plants and garden furniture outstrip supply, while staff have been furloughed. Now, complicated post-Brexit trading arrangements are acutely hitting the horticultura...