Not clematis wilt definitely. It looks to me as though it has been given too much nitrogen feed, stop feeding, give it plenty of water daily.
...................plus gallons and gallons and gallons of water.
What type of compost are you using, also the ' special clematis feed ' you mention is probably high potash, you need to use a balanced 1 . 1 . 1. fertiliser for root growth, vegetative growth and flowering.
Your clematis looks like one of the evergreens, James, possibly Pixie, Avalanche, Joe ?
Yes, these are seedheads, difficult to see if any seeds are set or if they are just seedtails.
I can't see anything there, James
Must say I like the hosta idea from 'plant pauper'..................divert the snails from the clematis !!
Not the easiest clematis to propagate, Perle d'Azure. The leaf joints are much farther apart than on most other clematis, so less cutting material.
Perle d'Azure is an excellent clematis and not prone to wilt. If your plant is in a 2 litre deep pot with good root system, then stand it in a bucket of cold water for a couple of hours, chop it hard back and then plant it out, about 2 inches deeper than it was when in its pot, it will soon send new shoots from the crown below ground. Then prune it hard back in February, every February. Perle d'Azure is special.
Vyvyan Pennell and Duchess of Edinburgh
Negritianka, White Magic, Morning Heaven are some of my favourites