Don’t attempt to remove it by hand as this will require a LOT of digging. Weeding is also ineffective, however it helps to remove the shoots as soon as they appear above ground. Use weedkiller with glyphosate/diflufenican on soil with no herbaceous perennials, bulbs or crops to stop new shoots. At this time of summer, growth is strong so use a tough weedkiller with glyphosate to keep the shoots at bay. Use a rake to bruise the shoots beforehand to ensure the solution effectively enters the weed.