Composting green waste on plot

Hi chaps, so there's a lot of greenery on my plot, remains of courgette plants, overgrown brassicas, spent bean plants etc, my 3 compost bins are full what can I do with the rest of it, I'd like to avoid building another bin so can i just pile it in a heap in the open and will it rot down over the winter for spreading next year ? should I cover it and/or turn it occasionally ? any advice very welcome.

All that material already in your compost bins will reduce in volume very rapidly, so I'd just stack your surplus material for a week and then add it to the bins as the levels fall.

I quite often have a heap of stuff that won't fit into the compost bins at this time of year.  If you cover your stack of material, it rots down faster.  The same is true of compost bins and then you can chuck the stacked stuff in as others have said.

It doesn't need anything fancy.  I use split open sacks that potting compost, bark or manure came in and weigh them down with planks of wood and bricks 

Mix in some brown corrugated cardboard, shredded paper, newspaper, toilet roll tubes etc etc if you can, don't put too much green stuff in at the same time otherwise it may become a slimy mess.