Easy ways to protect herbaceous herbs This winter
Common herbaceous perennial herbs include catnip, chives, fennel, lemon balm, lemongrass, mint, oregano and thyme.
In climates where winters are harsh, herbaceous perennials will die down to the ground when hit by hard frosts and reemerge from their roots in spring.
One of the easiest ways to protect herbaceous perennial herbs from the frosts and thaws of winter is to mulch them.
Here in Maryland where winters are relatively mild, I use leaves. Straw is also a good mulch choice.
Boughs from evergreen trees may also be placed over herbaceous perennial herbs to shelter them from frost, ice and snow—and it's a great way to recycle Christmas trees. The boughs, which will not decay very much over the winter, are easy to remove once the threat of frost has passed in spring.