To propagate lady’s mantle, the easiest method is to divide an established plant in early spring or autumn by digging up the entire clump, carefully separating it into smaller sections with a sharp knife, ensuring each piece has roots and shoots, and then replanting them individually at the same depth as the original plant; make sure to water thoroughly after transplanting. 

Key points about propagating lady’s mantle:

Best time to divide:

Early spring or early fall when the plant is dormant. 

Method: Dig up the entire plant, then use a sharp knife or spade to cut the root ball into sections, making sure each piece has a good amount of foliage attached. 

Planting new divisions: Plant each section at the same depth as the original plant and water well to establish.