rosmary looks pale

i bought a nice trailing rosmary from woolies and it looked perfect as i planted it, i put a bit of gravel under the plant to improve drainage, after two weeks some of the leaves look rather pale, what should i do, i dont think it is short of water , the soil is poor, but acid clay loam

 

Rosemary likes poor hot soil in good sun. Never heard of a trailing one, is it grafted?

I just moved mine cos I really had to but it looks very sick, but a new one from veg shop about 75p so not too desperate, but hate to loose anything.