Posted: 15/10/2012 at 18:57
It's probably a bit late in the year to treat sucessfully with glyphosate weedkiller. I'd dig it over a couple of times before even contemplating beds on an area infested with bindweed. That way you can try & remove as much as possible of the roots.
Then I'd cover the area with the weed membrane & leave it over the winter until spring next year. When you remove the membrane you'll soon see if/when the bindweed returns & can retreat asap & repeatedly until it, hopefully, gives up. Then go ahead with the beds. No easy way to ensure it's prevented from growing again.
Yes the membrane will stop weeds coming from beneath, but also prevent roots going deep for your plants. Also any tear of the membrane will allow the bindweed access to your bed again, so trying to eradicate it before you do the beds will pay dividends in the long run. Sorry to be so negative, but bindweed is very determined. J.