philadelphus coronarius Mock orange help

I’ve just picked up an incredibly pot bound and scraggly mock orange in the reduced section (5l pot) It’s been potted on and watered. Anything else I should do to rejuvenate it?

 

It will depend on it's general size, but if it's not being planted out, it'll be fine until next spring in the new pot. Just keep it somewhere where it isn't exposed to a lot of sun for the foreseeable.

If there's a lot of top growth, and it's not looking great, that can also be pruned back.

 

Why would you keep it out of the sun?

 

Because it's been pot bound, you've just repotted it and hopefully opened up the old root ball a bit; all of this will have damaged the roots quite a bit. So you keeping out of the sun in a sheltered spot reduces stress on the plant as the roots will need to transport less water. The same goes for reducing the top growth, if there is a lot. This will allow the roots to recover and regrow into the new compost ready for the next growing season.

 

It will only bloom on 'last years' wood, so if you prune it now, it may disappoint you next year but it will reward you later.

 

It's always difficult to advise when we can't see it, but a struggling plant left with lots of top growth will only tend to struggle more, so pruning back is always a good idea.
Even sun lovers will benefit from a bit of shade if they're in poor condition, until they've recovered, so @NigelJ has given the exact answer I'd have given if I'd seen the post.

There's also a huge difference between the heat of any available sun in the north of the country, and sun in the south, and the amount of it a plant gets is also a big factor. An hour of sun a day in the north, isn't the same as 8 or 9 hours in the south east. Shrubs tend to take longer to revive than perennials too.
We don't know where you're located @Anguisfragilis , so it's harder to give suitable advice.

 

@Anguisfragilis any chance of a photo , if its leggy and sprawling it may benefit from some shortening