It could be an aster (recently reclassified as Symphyotrichum), but I couldn't tell you which one - they are autumn-flowering, so give it a few weeks and see if any flowers appear.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
JennyJ's suggestion seems likely, especially as the Novi-Belgii ones are prone to mildew, which is partly why it looks weedy. The flowers could surprise you, some of them are lovely, or they might be the smaller greyish-mauve wild type ones, in which case you might still get rid. Lucky dip time!
The leaves look the same as an Aster (google images ), so I think you are right!
I will wait for it to flower then... I thought it was a weed at first as where they are in the garden, there are only a few single stem and tall ones... very random...certainly not bushy like the ones in google images...
I don't see any mildew in your pics, so they're probably a type that's not particularly prone to it (powdery mildew, the type that some asters get, tends to strike when conditions are dry, which most of us have had this year)
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I can see mildew on the leaves in the first picture JennyJ. It looks like the common wild flower - Michaelmas daisy. Once it flowers it should be clearer.
Cacoethes: An irresistible urge to do something inadvisable
I thought that was just the light reflecting off the leaves! When I used to have the Novae-belgae types, when they got mildew, it covered whole leaves and the stems too, starting at the bottom and working its way up, never just little patches on higher-up leaves. Maybe mine weren't typical. I gave up growing them because they always looked really manky at the bottom by the time they flowered.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
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Lucky dip time!
The leaves look the same as an Aster (google images
I will wait for it to flower then... I thought it was a weed at first as where they are in the garden, there are only a few single stem and tall ones... very random...certainly not bushy like the ones in google images...
Will read up on mildew, thanks again.