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.