Something has killed my impatiens that I have planted in front of my home. I think it was cutworms but have not seen a photo of them. It has a hard green shell that is scored. Only by reading a description of what they do is why I think it was cutworms. How do I get rid of them? And how often? Any advice is helpful.
Getting Rid of Cutworms
Certified GKH Gardening Expert
If it is cutworms, then this article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/get-rid-cutworms.htm
Neem oil may help with cutworms too, as well as most other insect pests. Here is more information: https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm