Creeping jenny is an excellent cover for edges of water gardens or waterfalls.  It grows to about 1-2  inches and creeps in the moist soil or water to 1 inch deep.  Its rounded leaves will clasp onto other leaves and form a tight clump of foliage with yellow, buttercup-like flowers appearing throughout the summer.    It will grow in sun or shade.  You can take short stem cuttings of this plant and begin new ones in a mixture of equal parts peat and perlite. 

I always have this plant in several areas of my pond covering rock edges, waterfalls and areas in my bog that I like to hide.  Its an easy plant to grow and is enjoyed by its bright yellow flowers and attractive foliage.