Cold Hardy Varieties
“Munstead”, “Hidcote Blue”, and “Phenomenal” are all known for being cold hardy varieties (as low as hardiness zone 4). Before buying plants, your best bet is to google lavender plants hardy to your zone, speak to a local master gardener, or peruse local gardening blogs and articles, and make a list of which varieties will work for your specific area and microclimate. Don’t trust that the local big box store is going to sell you a lavender variety that is great for your specific hardiness zone. Instead, go to a local small nursery with the varieties you’ve researched, and you’re likely to find one or two in stock (or they’ll be able to get them for you).