Robinia Red Robin

I would wait, as they are just about to put out their lovely new red leaves.

Do you mean Photinia? Robinia is something different and doesn't have a Red Robin variety. It would be a shame to trim back the attractive new shoots, best to wait until it gets out of hand.

I would leave it too - if I still had one. DH, in a fit of overenthusiastic pruning ignorance, chopped mine down. I was heartbroken. No room now to grow another ☹️.

We have lots of these, as does our neighbour and they are looking beautiful. I would give them a reprieve and let them do their lovely thing first.

Not until autumn - it is known as Red Robin because the fresh spring growth is red.

Mine seems to be about to produce flowers as well for the first time.

I agree with shysal - definitely not robinia, which is a fast growing tree with invasive roots. As we found to our cost.
Pretty though.

Yes, it's probably photinia

We have a robinia pseudoacacia and it is a tree

RHS advice:

If ‘Red Robin’ is grown as a hedge, remove the tips of young shoots to encourage the bright red leafy re-growth. They can be trimmed up to three times a year.

www.rhs.org.uk/advice/profile?pid=145

a great plant, I would trim after flowering.

Also if it gets a fungus, treat it with rose fungicide as these plants are in the rose family, as is spirea, cotoneaster, alchemilla , sorbus, rubus and prunus.

A timely post as the one in our large mixed border has suddenly doubled in size and lovely as the red leaves are I don't want it to take over.Only yesterday I made a mental note to look up when to prune.

Many thanks all. Much appreciated. I've checked in my garden notebook and it's Photinia. Thank goodness my daughter gave me a garden notebook. I am so bad with names.
I'd like to keep it in tight control as I only have a tiny London back garden.