Gaia, Demeter, Ceres (whatever your pet name for Mother Earth) is really quite a clever divine entity. She sends fruit to cool the febrile in summer and veg to soothe the flu-ridden in winter. And even when the fields are apparently barren and there is frost on the ground, she sends us stuff to use for salads. It may not be the pert lettuces and juicy tomatoes of summer, but it is still saladable.
If you have a herb patch, frankly there is no excuse for it to lie fallow at any time.