In addition to the above good advice, the larger the stone is the longer it takes to get covered with silt and dead organics. As the silt layer develops, it allows more weed growth. Larger stone also provides more habitat in terms of hiding places for invertebrates, esp crayfish, and fish. Invertebrates live on and in the attached growth of the rocks, micro-habitat. Broken concrete in hand movable chunks from construction projects works good along one side of the pond. I like broken cement sidewalk chunks. Contact cement contractors to see if they have a waste disposal site where you can get it for free. Be aware that limestone based rocks will sometimes grow more attached algae due to calcium phosphate dissolving form the limestone.
Last edited by Bill Cody; 03/14/16 03:11 PM.
