This past August 2016 I planted 2 English Lavender ‘hidcote’ plants. Now that the colder weather is coming, do I cut them back for the colder months or leave them as they are? They have been doing well thus far. I live in zone 5, the Ph of the soil was tested and is good; there has been good drainage as well. They have been receiving 6-8 hours of sunlight daily.
You could cut it back about 1/3 so you have some fragrant foliage to play with. Once it gets very cold after Christmas or so, you could cover it with boughs from discarded Christmas trees to protect it from dry winter wind. If is a snowy winter, you can cover it with snow to protects it.