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Cardboard used to starve vines of sun, should I place new soil on it?

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Hey guys, after talking with a few people about how to best kill a section of wild grapevine to make way for a bed of chaya/katuk/mexican sunflower/vetiver I decided to use cardboard to starve the area of sunlight. This was about 45 days ago and now 90pct of the vines are dead.

The question is: should I drop new soil or make a lasagna bed on top of the cardboard or should I take out the cardboard and put soil directly on the dead vines, or lastly, should I dig out the old grapevine and start fresh.

This is about 200 sq ft and has four mature pines at its borders. Zone 9b, Central Florida.
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Location: Kent, UK - Zone 8
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45 days doesn't sound long enough to actually kill a grape vine... if you disturb it now and allow light in it might just bounce right back again.

I would keep the cardboard down - perhaps even put a little extra down if there are gaps. You could bring in soil, but you are likely to bring in a host of weed with it. If you have access to mulch material like woodchip I would lay that on top of the cardboard and plant by doing transplants into slits through the cardboard.
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