Hi all. I have a small stream going into a small pond. At the head of the stream is a rock that I drilled to take the water pipe. I want to plant something at the back of the rock that will grow up and over the rock covering the pipe and most of the rock so it looks like the water is pouring through the plant. I thought I had found the perfect thing, Creeping Jenny, then I read just how invasive it can be. I have just got rid of an invasive alpine so I don't want that to happen again. Any suggestions of something that looks as good as the Jenny without the invasion? Thanks in advance.