Hi everyone,
I'm quite new here... I've posted mainly in the roses forum but I do have other plants as well in my garden so I'd require kindly a further little help.
I have a more or less 10 years old Nandina Domestica (I think it should be the Obsession variant)... height about 100-120 cms... the diameter of the bush is now around 1 mt.
I love this bush that keeps growing (in width!)... every year new branches grow and now the bush got really fat The only problem I have is that it steals space for the roses around, so I would like to get it slim.
How can it be properly pruned? cutting the external branches from the base? Just cutting with a brush cutter to give it a new shape maybe it shouldn't be good (or maybe yes?).
Thanks for your help!

Cut off any stems that crowd other plants all the way to the base. You will also have to remove the horizontal stems underground or they will send up more vertical stems.

In my experience, There's not much that you can do to harm nandina...
It's extremely aggressive here... dig the entire clump out and it still comes back...

As above... dig out as much as you need to get back the space for the roses...
Chop through the middle of the bush with an axe if necessary!

Any tall stalks remaining in the clump that hasn't been dug out can be cut to the ground... any short stalks can be kept, if you want.

Around here, that stuff spreads from the root system... and the berries have seeds which come up everywhere...