Posted: 30/08/2017 at 10:04
The white flowered plant is bindweed. It has white roots that crawl around under the earth and other plants roots and is almost impossible to dig out. Every bit broken off and left in the ground turns into another plant. It's a very common weed.
It does respond to glyphosate weedkiller, but so do roses - so you mustn't get it on the rose. Unwind as much of the bindweed as you can and stuff it into a clear plastic bag, then spray into the bag with glyphosate. If you are anti- weedkillers then just pull off all the bindweed whenever you see it, all through the season, which should weaken it.