In the formal water garden it is usual to grow one or more shaped, or naturally erect, plants at, or near, the corners of the pools. Cypresses, Thujas, Iris Yews, and Junipers are the most frequently used. English Box, small specimens of green or Golden Privet, or the Shrubby Honeysuckle (Lcnicera nitida) are also very effective. It is not out of order to leave a few small holes in the surrounding pavement, if it be of stone, so that small plants such as Thymes and Sedums can be planted to soften the harshness of the path.
The informal pool is arranged with rock pockets partly surrounding it; or it can be a natural looking pool set in the lawn, in the shade of a tree. The pockets may be planted with any small shrubs or alpines.
In either the formal or informal water garden it is in keeping to grow some of the accepted water - loving plants in the vicinity ',of the pool. Among these are found Iris Kaempferi (Japanese Iris); Trollius (Globe Flower); Astible (Meadow Sweet); Iris germanica (Bearded Iris); and Nandina domestica (The Sacred Bamboo of Japan), which all look well grouped in this position. Maidenhair Ferns, and some of the shade - loving carpeting plants, such as Heixine and Arenaria can also be used, while the large, blue trumpet fiqwers of Gentian look attractive in a small, shady pocket near the water's edge.
WHAT TO PLANT IN THE WATER FEATURE
Plants of ornamental value are grown in the pool, either
EGYPTIAN LOTUS. Sacred Lily. Nelumbo. - These large - leaved, aquatic Lilies, hold their leaves and flowers above the water, the flowers being on taller stems, well abovethe leaves. They are large and very showy, and have a flat - topped seed receptacle which becomes perforated like a pepper pot in order to release the seed.
There are two species, a yellow flowered one, native to America; and one with pink fragrant flowers, which is largely grown in big expanses of water. The latter, N. nucifera, sometimes known as N. speciosum, is a native of India, the East Indies, Japan, the Philippines and northern Australia. It grows best in soil made up of equal parts of loam and cow manure, and should be planted in a pool at least one foot deep.
RUSHES. - These are sometimes used in a pool, though they spread fairly rapidly and soon become too large a clump for a small pond. Rushes may also be planted at the boggy edge of a pool.
WATER HYACINTH. Eichornia crassipes. - Water Hyacinths make an attractive display of color, but they increase so rapidly that they cannot be recommended for use in a garden pool. These floating plants have broad, clean, fresh green leaves, restricted in the centre, the lower half of which forms a bladder. The leaves grow more or less in rosette formation, and several together cause the plant to float. The flowers, which are a shade of violet, are large, and held in a loose spike well above the water. Water Hyacinths are natives of tropical America and Africa, but have so accommodated themselves to the Australian climate that they are a proclaimed weed in Victoria, New South Wales and Queensland where they frequently choke waterways.
WATER LILY. Nymphoea. - The Water Lily is undoubtedly the best plant for the garden pool. There are a number of species found in different parts of the world and ranging in color from white to yellow and pink. The leaves are more or less circular, and float plate - like on the surface of the water. The flowers sometimes float, but are often held several inches above the water. One of the most beautiful Water Lilies, of a clear blue color, is native to New South Wales and Queensland. The flowers are small and the petals more cupped than those of the European species, and they are held on thin, erect stems well above the water.
There are also other plants placed in the pool to float, or grow in mud (covered with gravel) in the bottom. These small plants, which increase quickly, provide food for fish, and oxygenate the water.
AZOLLA. - These floating water plants, with tiny feathery leaves, are useful in helping to keep the water pure. Azolla increases very quickly and has to be reduced from time to time. Multiplication is so rapid that in Germany and the Panama, the plant is used as a cover to retard the breeding of mosquitoes.
COMMON HORNWORT. Ceratophyllum demersum. - This aquatic plant is found in many parts of the world, including Australia. The leaves are narrow and forked, and produced in whorls at intervals round the thin, wiry stems. The fruit has two curved spines near the base, which give this plant its common name.
ELODEA canadensis. - This is a much - branched, fresh water plant which spreads very rapidly and will choke watercourses or pools. It has short leaves arranged in whorls round the stem.
POND WEED. Potamogeton. - This useful, oxygenating genus has several species which are used in pools, aquaria and bowls. The leaves are narrow and totally submerged. The flowers are inconspicuous and borne in small spikes held above the water. Pond Weed needs to be anchored to a stone, before introducing it to the water.
WATER STARWORT. Callitriche verna. - Callitriche is a native aquatic plant with narrow, opposite leaves on slender stems up to twelve inches in length. This plant is found widely spread in swamps, pools and watercourses throughout Australia as well as in other parts of the world.