Can anyone identify this please?

I'd be inclined to leave it and see what happens. It's possible that it has grown from bird seed if it wasn't there before.
You might get a flower on it, wait and see, you can always pull it up if it's just all leaves and takes over.

I threw some of D's parrot seeds in her back garden a few years ago and come October had a huge gourd which GS made a lantern of, but they were much bigger leaves---like umbrellas

Oh yes, we're both intrigued and interested to see what happens, so we've not really any plans to remove it just yet. But golly, I don't want leaves the size of your gourd plant EllanVannin, haha! We really haven't got room in our little garden for something like that!

If it eventually turns into something with exotic flowers, I shall report back!

It's almost foxglove shaped leaves but they have a serrated edge. I used to grow verbascums and it could be that. Lovely flowers.

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Could it be Centaurea Montana, a perennial cornflower?

If it develops purple flowers then it might well be.
I'm not sure if it's a weed or not but I have a self-setter in a most inhospitable bit of ground an it is very pretty.

There are some apps you can download. You take a photo of a plant and it will tell you what it is. Maybe you can try that?

It looks like a mullien of some sort.. probably blown or flown in!!
I would wait and see.. if you dont like it when it flowers remove before it sets seed..
Some are quite tall and spectacular!

It could be Giant Mullein which is a wild flower (weed) in theVerbascum family.

Or evening primrose?

Thanks for all your suggestions. I don't think it's Centaura Montana - the leaves are too broad. And I know what you mean about it being like a foxglove, muse, but again, much bigger than any foxglove I've ever seen! We have evening primroses in our garden, Ro60, and the leaves are very much smaller than this monster!

I think Fleur and Avalon have got it right - it's definitely looking like a Mullein, probably the Great Mullein.

CafeAuLait I just put it on Plant Snap on my phone and it came up with Verbascum Thapsus, which is the proper name for Great Mullein, so there we have it! (I forgot I had that app - I stopped using it because it so often gives random results!)

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I let this thing have its way, and by golly has it grown! It’s now approaching 5k’ tall and just coming into slower. We will have to be extremely careful not to let it set seed, or else we will be over run with them next year

It’s always the way, we nurture a plant, feed and water with care but a weed (plant in the wrong place) grows so fast and strong.

Commonly called Aaron's rod. I don't know it's proper name. They do grow very tall.

MiniMoon

Commonly called Aaron's rod. I don't know it's proper name. They do grow very tall.

It’s verbascum thapsus, or Great Mullein. Quite a striking plant but I certainly don’t want it taking up permanent residence!

Yes, beat me to it JulieNoted.

Mullein weed?
Have a look on Google images.

Haha just noticed that I said it was now 5k’ tall. Er no, it’s 5’ not 5000’ ???

sharon103

Mullein weed?
Have a look on Google images.

Yes, if you read above, you will see that it has already been identified as Great Mullein.