Feeding plants of any kind when they're struggling is never a good idea. Far better to improve the soil with organic matter, and wait until they're thriving if you want to add food of any kind. They'll always struggle in cold weather, and in cold wet sites in particular.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
It is considerably warmer here than in Wales but we've had a long, cold, wet winter - for here. I have two of these plants the same age but behaving differently.
One is in the ground and planted against a metal grid fence that forms the chicken run. It's foliage is green and bonny with just a hint of red on a few leaves. It was planted in good, fertile soil and mulched with well rotted garden compost including a good dollop of pelleted chicken manure. I watered it regularly all last summer as we had drought and plants here can take 2 years to get their roots down deep enough.
The second is still in a large pot, outside and up against the polytunnel wall so it's sheltered from northerly winds. It hasn't been watered over winter except by rainfall and has quite a lot of red foliage. That will resolve itself as soon as I decide wheer it's going to live permanently.
In short, I think you need to address the water issue so would advise giving them a few good soaks of 15litres of water each, poured slowly so it soaks in rather than running off and then, once wetted, a good thick mulch of 3 or 4 inches of well-rotted compost or even just chipped bark to retain that moisture. Let them recover and then, if you want to feed once they are less stressed, give them some liquid comfrey tea or tomato fertiliser but don't do this later than end of June, mid July. you don't want new soft sappy growth that hasn't time to harden off before the forsts arrive again.
Vendée - 20kms from Atlantic coast.
"The price good men (and women) pay for indifference to public affairs is to be ruled by evil men (and women)."
Trachelospermum is semi evergreen so lose a percentage of their leaves at the end of each winter, turning red before they drop so yours is doing what comes naturally. Any plant growing at the bottom of a wall needs to be watered so dryness is probably part of why your plant is unhappy. Cold weather also makes them look miserable. Wait a month then trim off any dead tips of branches, keep it watered and no feeding until growing strongly with new growth. It is hard work to keep them growing well in a container due to lack of water and nutrients.
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They'll always struggle in cold weather, and in cold wet sites in particular.
I live in west central Scotland - not where that photo is...
One is in the ground and planted against a metal grid fence that forms the chicken run. It's foliage is green and bonny with just a hint of red on a few leaves. It was planted in good, fertile soil and mulched with well rotted garden compost including a good dollop of pelleted chicken manure. I watered it regularly all last summer as we had drought and plants here can take 2 years to get their roots down deep enough.
The second is still in a large pot, outside and up against the polytunnel wall so it's sheltered from northerly winds. It hasn't been watered over winter except by rainfall and has quite a lot of red foliage. That will resolve itself as soon as I decide wheer it's going to live permanently.
In short, I think you need to address the water issue so would advise giving them a few good soaks of 15litres of water each, poured slowly so it soaks in rather than running off and then, once wetted, a good thick mulch of 3 or 4 inches of well-rotted compost or even just chipped bark to retain that moisture. Let them recover and then, if you want to feed once they are less stressed, give them some liquid comfrey tea or tomato fertiliser but don't do this later than end of June, mid July. you don't want new soft sappy growth that hasn't time to harden off before the forsts arrive again.