Would be a good idea to dig down and check the roots. The yellowing suggests over watering. The main thing is not so much the amount of water but whether it drains away. Soggy anaerobic soil isn't good for them.

These plants hate wet feet...but need moist soil & well drained, they need sun but look better in partial sun/shade....curling leaves mean too much sun, burnt/browning leaves too much sun also, yellowing leaves too much water so it is going to be finding the right combination of all....during the cooler months they will go to sleep and die back and return in the Spring. These plants are beautiful and fragrant and well worth the trouble...just do not get too frustrated and keep working at it. "SMILE" did I tell you grasshoppers love the leaves....sorry

This post was edited by sandnsea on Thu, Sep 19, 13 at 22:56