Poppy problem on Veg plot
I am trying to recover an area of my garden to use for vegetables. It's about 50m2, and the previous owner covered it in poppies, which flower late in the spring and seem to dwarf over anything we plant and grow ferociously, sapping the life out of anything I plant. The bed was treated with roundup, and visible roots were lifted last year, but many still survived.
As I prepare the beds to try again this year - what can I do to try and rid them of the perennials?