Plants provide a natural balance on the quality of the water. Plant eaters such as ducks and large carp make filtration essential for any sort of water clarity to be attained. Plants range from submerged oxygenators to emergent marginals with just their feet in the water.
Water Lily blooms float on the surface but their roots are firmly embedded in the bottom of the pond. Choice of lily variety will be dictated by the depth of water. The smallest variety needs only 15cms depth and the most vigorous water lilies can be planted in 1metre depth and over the years spread into even deeper water and are thus unsuitable for the average garden pond.
Marginal plants need about 5cm of water covering their pot. Aquatic plants are usually planted in special mesh containers with gravel over the top of the compost.
Pond design should include a shelf 20-25cm deep to accommodate Marginal plants . At the pond centre a depth of 45-60cm will suit Water lilies, Oxygenators and fish. Aquatics thrive in sunlisght and waterlilies need full sunlight for at least half the day. An excess of autumn leaves can pollute the pond.
Ponds can be made from preformed moulded plastics, flexible sheet liners, reinforced cement mortar and even concrete. Natural ponds can be dug into clay ground with variable success.
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