Empty plot over the winter - to cover or not

So, most of you know that I haven't grown much veg I've r the last couple of years. Pretty much beans, courgettes, and gourds  and then green house crops.

So when I dig up my dahlias and take down my bean poles apart from a small patch it will be empty until May. 

Last year I covered it all in black plastic that I found. It's ripped everywhere so I could only save a few sections. Ideas please. I'm not trooping round shops looking for card. But I am willing to buy something so long as it will last me several years and I can reuse lots.