Convolvulus arvensis -- oh lucky day!


We moved to a new house this summer, partly for increased garden space.  Got a great bargain -- and about a 10 by 15 meter patch of bindweed.  I thought that, for the first time in my gardening life, I might do something non-organic.  I guess I should have investigated this further before purchasing, because now that it's winter and I have time to look things up on the net I see that apparently even herbicides don't work on this stuff. 

Has anyone had any success with any technique at all?  Hand-digging seems utterly impractical.  I've tried black plastic before, with no success after three years of continuous coverage.  I'm considering having a guy with a backhoe dig up the soil in that area and take it away to use for fill (hopefully somewhere very deep, and under a concrete slab).  This could be expensive, though.

I expect to be eternally grateful for any suggestions,

-- Susannah
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