Cutting back herb plants or not???
I live in metro Atlanta and my herb garden is 3 years old and is planted in the ground. Some of the herbs have gotten "stringy" and only the ends of the stems produce herbs as would be expected. The bottom half (or more) of the plants are dead-looking and some have outgrown their space. The herbs have lived without requiring replanting and come back every year and I'd like to keep it that way. My question is can I cut back (without damaging them) any or all of the following and, if so, what time of year and do I cut back at the ground level?
Thyme- mostly non-producing stems. Few thyme leaves
Rosemary- It lives year round-- may just trim & cut back
Also, for what its worth, I bought some Mexican tarragon plants and they die with freezing weather and come back every year. I've never had any luck with French tarragon.
Thanks to all,