hello, a lovely neighbour gifted me this to put along my front garden bed, but I have no idea what it is or what to do with it and too embarrassed to ask. I am not a gardener! What is this plant? Do I plant it as one clump or tease it apart and plant several? I had thought she had said she was giving me seeds but then found this on my doorstep. They are so kind and I want to definitely use this properly.