A way to keep empty ground from becoming a sea of weeds, is to spread a thickish layer of manure over the whole surface, then add a layer of straw, up to a foot deep. If you have lots of cardboard put that in as a sandwich (ie between the manure and the straw) and it will slow down the perennials such as thistle, although not stop them. You could cover the lot with a tarp or black plastic if you have it, but not necessary. Next year when you are ready to plant you will find a wonderful, friable, clean soil, into which you can plant straight away with no digging, or minimal digging if the perennials stayed. If you are leaving the ground for longer then you need to repeat this every year as the manure and straw, and the cardboard if you used it, will have rotted clean away, and been incorporated into the soil by earthworms
We have some veg areas fallow this year and have seeded them with grass. This is cut frequently just like the lawn, which keeps down weeds. When we decide to re-use these areas, maybe in a few years, we can simply remove the turf (stack it to rot to loam) and expose a cleanish surface below.