Posted: 14/05/2017 at 18:55
No need to deadhead Joanna - in fact , many clematis have very attractive seedheads, but you'll find the petals will discolour and drop off by themselves usually.
You can take off any stems where the foliage is brown - back to a pair of buds or a leaf joint. There's been a lot of cold, dry, frosty weather recently almost everywhere in the country, and any new soft growth on clematis can be affected by that. As the weather warms up, it'll come away again.
As you've just planted it, it may have made it a bit more vulnerable if the weather suddenly turned chilly, and it's trying to establish. If it was grown or kept undercover prior to that, that won't have helped.
Just make sure it doesn't dry out for now - a good mulch after watering will also help - but try and water when the weather is favourable (ie no frost forecast) if possible until it really gets going.