*The rule of thumb is that plants are winter hardy in containers if it is two zones hardier than the zone you live in*. https://www.greatgardenplants.com/Great Garden Plants> is located in zone 6, which means we can grow plants hardy to zones 4 and lower without problem in containers. We always recommend growing plants that are two zones hardier for success. But don’t let this rule stop you! If you’re determined to grow plants that are hardy to your zone (or just one zone hardier), there are some extra steps you should take to make sure they survive.