I question that is it NOT a weed because there are absolutely no plants like it in the area. It's growing by my little pond and sweet bay plant. Please help with this plant. I will pot it up if no one knows. If it is a weed, it does have strong growth, I will get rid of it far away..
Euphorbia, though which one ? Watch out for the sap, it is very unpleasant if it gets into your eyes.