Lavandula angustifolia (Tähkälaventeli)

We buy some Lavandulas each spring for decoration and for the kitchen. Usually I have to throw them away in autumn, because they are not very winter hardy. 2019 we tried to find 8 similar Lavandulas, but bought of mistake 4 L.angustifolia and 4 L.stoechas. In the autumn I decided to try them outside, but in the spring all angustifolias were dead and all stoechas alive. My short experience is thus that L.stoechas is more hardy of these two species.