Pruning leggy star jasmine

Do you have advice for how I should be pruning my star jasmine. I have 3 of these along my fence. They were previously in trough planters which probably weren’t large enough in hindsight, but are now in the ground in fresh soil as of a few weeks ago. They have got quite leggy over the years. What’s the best way to get them back to their best? Photos included.

 

They don't look leggy - I think they were not happy being in troughs and will recover when they get their roots down into some good fertile soil. Each plant will want to get to about 30ft so they can be vigorous and hungry plants.
They do need decent soil and as much sun as possible.
They're not hardy in all parts of the UK, but you don't say where you are.

In March give them a good handful of blood, fish and bone (keeping it a few inches away from the main stem/s) and on top of that, a 3-4" mulch of well rotted manure to set them up for the rest of the summer. Repeat each year.

By next summer they should be growing very strongly.
Once flowering is over, they send out long whippy new growth.
You can either tie that in, or cut them off if it's getting too out of hand.

 

Thanks for the advice, and will follow that! Yes, they looked very root bound in the trough so hopefully will see them rebound now they’re in the ground. We’re in London, and have survived the winters over the last years so fingers crossed.

 

They can be cut down to 3-4 ft from the ground for a hard prune if they are out of hand and you want to retrain them. You will lose flowers the first year after a hard prune or you can lower the tops gradually over 3-4 years, in Spring.