If you have to clear a large area of weeds like an allotment, and you haven't got space in your compost bin, you can pull the weeds up and spread them between the beds to make paths, as you might do with straw. Gradually the weeds will rot down and add their goodness to the soil. It's true you may get a few weed seeds, but it's time-saving and the weeds can be easily be forked into a compost bin when they have reduced some of their bulk. With the bare soil, it's a good idea to cover it with cardboard or mulch sheet weighed down against the wind with rocks or other heavy objects to save your hard work! Or, if you've already removed the perennial weeds and you are returning to the plot within a week to two weeks, you can leave it bare and hand-weed or hoe it again just before you sow. This is what some gardeners call a 'stale seed bed'.