Some ground elder has come through from next door's garden and I have sprayed it with glyphosate solution some days ago. No reaction so far. How soon can I expect to see some effect. I am about to spray another pernicious weed. I don't know what it is called. Had never seen it till we moved from Herts. to Bucks. It has a pink flower if one leaves it that long and long white roots and is spreading everywhere. Very difficult to get all the root out and it seems to spread that way as well as by other means.