plants
A garden pond can be left to its own device as a miniature nature reserve, but will be a much more attractive feature if it is stocked with aquatic plants and ornamental fish. The key to a successful, thriving water garden is balance. Plants balance a pool ecologically by oxygenating and shading it (algae flourish in too much sunlight). Get the natural balance right and the pond will be virtually self-sustaining, needing only occasional attention to keep it is good condition. If you are stocking a new pond from scratch, get the plants established before introducing the fish. Always buy plants from a reputable source, to ensure that they are healthy. Do not be tempted to use ordinary garden soil, or to plant directly in soil spread on the bottom of the pond. Always use fertilizers made for pond plants.
Golden Rule - Always top pond plant containers with gravel to stop fish from disturbing the soil and therefore discoloring the water.