Sedums
im sure I've divided these sedums last year...they have become like giant spiders. im guessing I should have staked them? Would that prevent this happening or would Chelsea chopping them help next year. Not sure what to do with them - usually leave them until spring with heads on but I'd like to tidy that bed up more thoroughly and get some evergreens in there. Any advice please? 
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I give mine the Chelsea chop and also place a hoop support for them to grow through to keep them tidy.
I give mine the chelsea chop, I cut them almost to the ground. At the moment they are all stand up nice and neat. Sedums look awful when they do that
Thankyou both for your quick replies and good advice. What you you both do now it they were in your garden Please?
Not much you can do now just enjoy the flowers and the visits from butterfly's and bee's.
Thanks perki, I could do with trying to tidy up a bit as I'd like to get a couple of evergreens in for autumn, would it be ok to chop back to around 10 inches diameter
Do that and you will be cutting off the flowers. Wait until the flowers have finished.
The trouble with doing the Chelsea chop is you get smaller, less impressive flowers.
I remmber Alan Titchmarsh, years ago, recommending that you lift the plants slightly with a fork in the spring, just enough to break the roots, but not otherwise disturbing them, and that this should stop them splaying. I think more sun and a less rich soil also help.
those I dug up and moved this spring are very good
In the sticks near Peterborough
My theory is that when they sprawl like that, they're trying to get away from each other. Time to split the clumps, once they've died back. Nutcutlet's post bears this out.
Two of my sedums, in pots, got decimated by mildew. Another hybrid, in the ground, is absolutely fine, no watering or particular care. Could it be too rich soil in the pots, or is it something to do with the watering regime?