I have bad luck with grocery store herbs it seems. I’m constantly roped in by this apparent value in buying an organic potted plant for $3.99 versus the finite bunch o’ herbs for $2.99. The problem is, I can never keep the darn things alive.
The first thing I’m doing wrong, as will not be stated in this article below, is laziness. I never actually repot these things with new soil. So if you are doing the same thing as I have been, start there. Get a small clay pot and a bag of potting soil and repot your new plant. If you continue to have brown leaves, leaf drop or yellowing leaves, then the article below should cover your bases: