Black Narcissus….. when I can prune

I have a Black narcissus and want to cut it back as it’s getting unruly.
Can I prune now and where do I make the cuts in the wood. I have taken a picture for anyone to see.

 

@Judy1979 I can find Dahlia "Black Narcissus", but the picture and mention of wood would indicate not a dahlia. Can you confirm name and species or type of plant.

 

Sambucus nigra ‘Black Lace’
Sorry, I should have been more precise. Thank you for replying

 

Dahlia 'Black Narcissus' | BBC Gardeners World Magazine

But looks more like sambucus to me.

 

It is sambucus, my mistake .

 

Personally I would prune in winter.
As far as I know its quite fast growing so could become a yearly problem if you want it small.

 

So now is too soon ? It’s not flowering now, just leaves.

 

Well you could do it now if you must, but it doesn't exactly look out of hand to me, I just think if you wanted something small its probably not the best option.

 

If you prune now it will shoot in a week or so and either you will need to trim again in spring or if we get a cold snap again this December the new growth will all get killed off. If you prune in winter then it will resprout in spring and grow away quickly.

 

Also its occurred to me that oif the intention is for flowers? Then maybe pruning should actually take place after flowering, anything during later times is likely to cut off flowering wood.
But not grown this plant, so only a thought.