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Yeah although I wrote 'cut back everything', I actually leave what I can, but I think when stuff goes mushy and rotten (eg. nasturtiums, geraniums, banana) or completely collapsed and flopping over (eg. water iris, gingers, some of the crocosmias) then I'll cut back to try and reduce possible fungal or root rock problems.
lemonade
hoefla
I'd suggest not cutting back anything - if it's perennial, cutting now risks frost damaging whatever it is. The messy stuff might be hiding little creatures over winter or hold seeds or other edibles.