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I love watching Gardeners World but I’m always so jealous of the long growing season that Bongs get, compared to Canada.
Most of their perennials are annuals over here due to the hard frosts over winter. I’ve seen a lot of use of cold frames and hinged low tunnels on that show, can anyone attest to those being helpful in around Zone 5? If not for overwintering, getting a good head start in the season?