Q.Identification
Can anyone tell me what this is? It’s very invasive and I assume it’s a weed. Thanks in anticipation! Shelagh.

Certified GKH Gardening Expert
You may have to consider this a permanent resident. Equisetum is an ancient plant that reproduces by spore AND underground root system. They will not go peacefully, and you will kill your entire lawn trying to get rid of it.
Here are some articles for more information:
https://www.gardeningknowhow.com/edible/herbs/horsetail/horsetail-weed-control.htm
https://www.gardeningknowhow.com/edible/herbs/horsetail/harvesting-horsetail-herbs.htm
https://www.gardeningknowhow.com/edible/herbs/horsetail/horsetail-herb-growing.htm