They have a habit of doing this, particularly in the middle of summer (sorry, I know its still only spring but we've had a really dry spell), a good tidy and a feed (and lots of wet) should help it. If you think the pot looks a bit small for it then it's probably time for a bigger one, or preferably a nice sheltered spot in the ground. I've got a baby one and a wisley cream currently in pots and I really struggle to keep them hydrated
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How big is the pot?
How often do you water it?
I would not feed a sick plant, just give it water. Once it has leaves again, you can feed.
When you don't even know who's in the team
S.Yorkshire/Derbyshire border