Cotinus 'Young Lady' cuttings - what to do?

A few years ago i bought three Cotinus 'Young Lady' plants online, they arrived looking dead. I got my money back, but i attempted to rescue them.

Two of them remained dead, one remained a tad promising insofar as its main stem stayed green over winter and sported the smallest of growth the following year and poor growth the year after

Spring 2024 (three years later) it has started to grow well, so i took some cuttings late spring (June, July), and they are now (September) just starting to show some roots out the bottom of the pot and the leaves are turning a deep red colour.

Normally i would empty the pot and pot them on, but being a little nervous about losing them, i'm not sure what to do............. Do it or wait until the spring? Put them in the greenhouse or leave them outside.

Really don't want to lose them. What would you do?

 

This is where a ventilated cold frame comes in handy.
Cuttings rooted this late are better left alone overwinter and potted on around March as growth is starting IMO.

 

Four cuttings in the pot.

 

They won't grow a lot over winter, so leaving them till spring to separate should be fine. I would keep them undercover but without artificial heat, and check them periodically for dryness. You don't want the compost to be wet, but equally the roots need some moisture.