rhodocoma Browning

I’m after some advice if I may. Pictured I’ve got a rhodocoma in a pot. The pot gets full sun and sea air exposure. I’ve just returned after 6 weeks away from this holiday home to find it in this condition. It has had a drip feed irrigation on but perhaps not enough.
Firstly, is it worth having this plant in a fun sun pot where I’m frequently away so can’t care for it? Garden centre said it would be good for this but I’m not sure.
Secondly, assuming I keep it for now at least, do I cut it back or leave the brown foliage to fall off naturally ?
Any thoughts welcome!
Location is coastal south Cornwall if that’s of help.
Thanks
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