My Rosemary Herb plant

I have two Rosemary Herbs, each planted in a different pot that I purchased as young plants, not from seeds.  I transplanted each in their own pot and sprayed good with my Spray N Grow mixed with Mr. Bill's.  I also poured some of the mixture directly on the roots when transplanting.  One of the plants is doing great.  It is growing and I have already sniped some and used it, but the other is not doing well at all.  It looks like it is dying or something.  It has not showed any signs of growth or perking up even with the Spray N Grow being applied at least every 4 days or so. I have it in a very sunny place on my patio and it gets plenty of sunlight and sun.  I only water it when it is completely dry, as I read for its care, bt still it looks terrible.  Is there anything I can do to help this poor little thing survive?  Thanks for any advice.....Eileen