its horsetail. blooming nightmare to get rid of. all you need is round up weed killer, just bruise it a bit and spray the weed killer. ensure no little bit falls onto the ground otherwise it will grow. roots go very deep and if pulled they break so best option is weedkiller it all top to bottom. ensure when winter approaches to just blast every bruised shoot with weed killer so when they take their juices down to preserve during winter they take the weed killer as well in the hope it kills the deep root system.