It’s getting chilly out there, with the first frosts slowly sweeping over the UK. That means it’s time to start thinking about frost protection – and it’s worth knowing about the four-degree rule.
It’s pretty self-explanatory: the four-degree rule advises gardeners to start protecting their tender plants when temperatures are predicted to fall to 4°C or less. It’s basically the green light that tells us to start protecting our plants from frost. But is it effective? And does it apply to all plants?
