I can only say that with us it isn't, whereas maculatum here is very invasive and we can only control it by pulling up the leaves when we can see them. Digging them out is a no go as they are so often growing in amongst plants that we want.
Is it really arum? It looks very like what I have in my garden. Bought under the name "asarum something or other". It never gets more than about 20 cm tall and if you look in the middle of the clump you'll find these brown flower buds with long 'tails', as they develop they look like mice diving down a hole. See pics. It's a pain, I thought I'd eradicated this clump about 2 years ago and it's come back again! Lots of horrid little rhizomes to get rid of.
I do have arum italicum, which is fairly well behaved, and the arum maculatum from my neighbour's side which I pull out when I see it. Neither forms clumps like this.
Arum maculatum, aka 'cuckoo pint' and 'lords and ladies' amongst many other common names. It is difficult to control as weedkiller doesn't seem to work and if you dig them out, they have a small knobbly soil-coloured corm and these usually break-off and remain in the soil. Some folk like them and they're good for wildlife, although the red berries in summer are poisonous to us and every seed seems to be viable, so they spread easily.
All you can do is dig them up from where they are unwelcome and try to get the corms out (that's also the only part which will have any roots on.) Because more will keep appearing in future years, just pull those up when seen and they will eventually give-up.
@BobTheGardener I’ve just dug up a very tiny two leaves piece... is this the corm?
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