Hi Jane and welcome to GoY as it is in a pot are you keeping it well enough watered? Could it be root bound - i.e. to big for the pot it is in?

Hi Jane... or is it possible you have over-watered the Rosemary ?

Hmmm, not sure about that Mg
I wondered about overdoing it too, i've experienced their leaves going crispy and brown when not watered enough.

Yup thinking about it more likely over rather than under watered,especially given where they grow in the Med.

How long have you had the plant? Have you ever repotted it?

Rosemary are supposed to be able to survive dry conditions, so overwatering would do so much more damage than underwatering.

I find they go a bit yellow when they need repotting - it might just be starving.

I feed my rosemary with Baby Bio for herbs. It says use 5-10 drops per 1/2 litre of water or half capful per litre of water, every two weeks.

This may help. Use it when the plant is actively growing in Spring & Summer.

I have noticed that mine has slowed right down, so I think that it may be a bit late to feed.

Others may have more advice to do with feeding.

I wouldn't recommend feeding at this time of year but in spring and summer you could I suppose. Rosemary though grows naturally in very poor soil.

I have a Rosemary growing in a sunny, dry, area of rather poor soil ... The plant is healthy, and right now is producing lots of flowers very happily ...

If you saw the huge bushes grown in really impoverished soil around the Med. you'd know you're doing exactly the right thing!