I have 5 beds of 3x5metres. One bed stays overwinter with leaks,cabbage and brussels. The other 4 beds get dug over,covered in about 3inches of compost and then covered with thick black plastic (the type used for damp-proofing). Come March the next year,each bed gets uncovered when ready to be planted,dug over,fed with a general purpose feed and treated for wireworms 2 weeks before the plants go in. Once the plants are in,the bed gets mulched with old straw from the chicken coop. This works for me and keeps down the majority of weeds,what does come through is weak where it's poked through the mulch and easy to pull...... Ree