If the tops are free of blight then, yes, chuck 'em all in, and the onion stuff. It'll all rot down.

Crikey, worthy1, that was quick, thanks. I'd only just put my pen down !

Don't remove the foliage though until you are ready to harvest the potatoes.

Absolute rubbish answers. The Potato family belong to the Tomato family. The foliage of these plants should never be put into the compost bin, or dug into the garden.
Dry them off and burn, and their viruses with them.
Same applies to Brassic Roots which harbour pests.

Onion and Garlic foliage yes.

Sorry to get cross, thought everyone knew.

I have always composted healthy tomato growth. but never any diseased looking stuff.

You have opened a can of worms here, Diane!!!!!! I expect that some GoYers will agree with you and others disagree. You base your argument on these plants harbouring viruses. Well, they may and infected plants should not be composted but most plants are liable to be infected by a virus and I am sure that you are not saying that we should not compost any green material. If I see virused material, or other disease, in any plants they go in the wheelie bin otherwise I consider them possible for the compost heap.
I see two problems with our potatoes:
1) there is such a lot of soft green vegetation that it would un-balance the compost heap and,
2) getting small potatoes or sprouting peelings in the bin. These can be spread around the garden in the compost when it is used.
Not getting at you, Diane, but a different opinion.
And Hank, no problem with the onions.

Boy, I appear to have opened a real can of worms here. Thanks for the replies though, it makes interesting reading. i wonder if anyone else will weigh in on this question ?

Both potatoes and tomatoes belong to the Solanum family. Whilst I would not compost visibly blighted potato or tomato tops the RHS site has this to say on the subject of potato blight:

"The pathogen overwinters in rotten potatoes left in the ground or by the sides of fields. However, the great majority of infections in gardens arise from wind-blown sporangia."

To me this disproves the perceived wisdom that they can not be composted.

Hank I always leave the stems on the onions so that I can plait them and hang them up to store for the winter but, as already said, no problem with composting them.

How odd ! This is my 33rd year growing vegetables
and what I said has been true since the day I started.
Best to make up your own minds.
I should have put dont put Onion stems in the compost bin if they have Grey Mould disease, forgot.

Thanks MG, buy I have little idea how to plait Them, I've got about 25 super onions and may experiment.

I love this stuff! HEALTHY green veg plant waste can go on the heap, whatever it is.

Hank if you want pm me and I'll send you details of how to plait (braid) onions. I'll need you e-address to send you the info clearly.

Some people put them into the legs of old stockings - haven't tried this,as I plaited mine when I grew them.

We use old stockings for the ones that haven't enough foliage to plait Stera.

I've not worn stockings for ages - so what do I do now, buy new, just for my onions?

worthy!!!! that is an image that will stay with me all day. naughty boy.