I answered on your other post, repeating here:

My thyme does not turn brown in the winter. It appears alive although its winter color has some purple to it but never brown. Do not do anything now. Wait for the warmth of spring to see what life there is in your plants.

Just so you know, the first winter is the true test for any plant north of the frost line. If you wind up having a lot of loss, you will need to see if something else will do better there for you. It may be too cold, not enough drainage, wrong kind of thyme for climate, and so on for your planting.

FataMorgana

I recently just bought a potted thyme from a nursery, repotted, and now my plant has shriveled up and browned. Any suggestions how to revive my favorite little herbie?