Posted: 10/02/2018 at 09:30
Lavendula stoechas ( the ones with the bunny ears) are generally thought to be tender. It depends quite a bit on the drainage, grown on thin poor soil, with sharp drainage, they will be hardier than soft growth on rich soil with poor drainage.
If you have had snow, it is probably too late. Even here in the midlands, they do not usually survive a winter outside. I usually pot them with a lot of grit, but lately I have given up, as I have a bed of L. angustifolia which is pretty hardy, and I just shear it over each spring.