@mikeymustard don't give up on your Carnaby clematis. They often throw up new growth from beneath the soil. Just make sure that all old stems are cleared away.
Cacoethes: An irresistible urge to do something inadvisable
Mary Rose is a group 3 viticella and, in theory, they don't get clematis wilt. However, they do go crispy if under watered. Clematis need lots of water. It's also possible that some naughty slug or snail has chewed the stems at the base and made them unable to pass water and nutrients up the stems.
I suggest you cut off those dead stems right at the base and keep the pot watered until those new leaves die down for autumn. Then wrap some bubble wrap round the pot to protect it from winter frosts.
Come spring, cut the old stems at the base then give it a generous handful of specialist slow release clematis food and a good drink of water. Train the new shoots along the supports as they appear. Add liquid tomato feed to the water once a week to help it along as the nutrients in planting compost only last 90 days or so and clematis are hungry plants as well as thirsty.
Vendée - 20kms from Atlantic coast.
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See the 3 stems that are brown on the left side of the plant ? Can you cut through one of these stems about 12 inches above the ground and see if it is green or brown, please ?
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I suggest you cut off those dead stems right at the base and keep the pot watered until those new leaves die down for autumn. Then wrap some bubble wrap round the pot to protect it from winter frosts.
Come spring, cut the old stems at the base then give it a generous handful of specialist slow release clematis food and a good drink of water. Train the new shoots along the supports as they appear. Add liquid tomato feed to the water once a week to help it along as the nutrients in planting compost only last 90 days or so and clematis are hungry plants as well as thirsty.
It looks as though it hasn't been planted deep enough from here.