Bit late for Shasta daisies to still have been flowering in autumn - are you sure that's what they are? What colour are the flowers and how tall is it?

Flowers are white with yellow centre and the one stem I haven't cut back is 41". They might not be Shastas. Encroaching on other plants seems to be their habit.

Moving them into direct sun will reduce the flopping over. Daisies are cheerful perky flowers that take me back to childhood (picking a bunch for momma or my teacher if I thought she was pretty). They do tend to spread, but you can slice the clump in half using a simple bread knife.

I was just wondering if they were the perennial Heleniums which are highly invasive and very tall, but they're yellow, not white. Shasta do spread, its usual to dig out half every other year, and they do get taller in shade, and because they get taller,they tend to topple more. There are shorter or dwarf versions - Leucanthemum superbum
'Snowcap' or 'Snow Lady', which only reach a couple of feet and don't topple over.

I suppose, with this ridiculous random weather we're having, I shouldn't be surprised yours have been in flower so recently!

I found Leucanthemum superbum was prime slug food.Mine disappeared the first night after planting...
And they are so lovely too. Definitely worth a go though - the lemon cream ones are specially gorgeous.

I dig them up and split them, discarding the old centres and replant a small healthy piece. I repot the other healthy bits and sell them. This is done about every 3 yrs.

And it does not seem late to me for them to be still flowering. Ours (the old Wirral Supreme) are still going strong.
We cannot keep any of the new smaller ones though, they get eaten to nothing within hours of planting.
Definitely need dividing and replanting every three years to keep them healthy.

Thankyou everyone. If they are so much better in sun I will have to lose them. They are cheerful blooms but too much hard work for me. Might try a shorter one next year. My garden is a constant problem with me; nowhere has full sun and much of it is in shade. Having said that, I enjoy finding a plant that does well in a particular place.
Strange, but these daisies don't seem to attract slugs here.
Again, many thanks for your help.
I think i will pot some pieces up and put them on freecycle.
Hate wasting plants.