Aucuba japonica, commonly called spotted laurel,[ Japanese aucuba][ or gold dust plant (U.S.), is a shrub () native plant to rich forest soils of moist valleys, thickets, by streams and near shaded moist rocks in China, Korea, and Japan.][ Kew World Checklist of Selected Plant Families] This is the species of Aucuba commonly seen in gardens - often in variegated form. The leaves are opposite, broad lanceolate, long and wide. Aucuba japonica are dioecious. The are small, diameter, each with four purplish-brown petals; they are produced in clusters of 10-30 in a loose cyme. The fruit is a red drupe approximately in diameter that is avoided by birds.
The golden variegation patterns are inherited from the mother plant. If the female plant is variegated, the seedlings will be variegated regardless of what the male looks like. If the female plant is green and male is variegated, the seedlings will be green. This indicates that the cause of variegation is not under the control of the DNA of the Cell nucleus, but probably under the control of the where photosynthesis occurs. Chloroplasts float in the cytoplasm of each cell and are inherited from the female parent.
History
Aucuba japonica was introduced into England in 1783 by Philip Miller's pupil John Graeffer, at first as a plant for a heated greenhouse. It became widely cultivated as the "gold plant" by 19th-century gardeners. The plants being grown were female, and it was a purpose of Robert Fortune's botanizing trip to newly opened Japan in 1861 to locate a male. It was located in the garden of Dr. Hall, resident at Yokohama, and sent to the nursery of Standish & Noble at Bagshot, Surrey. The firm's mother plant was fertilized and displayed, covered with red berries, at Kensington in 1864, creating a sensation that climaxed in 1891 with the statement from the Royal Horticultural Society's secretary, the Rev. W. Wilkes, "You can hardly have too much of it".[Coats (1964) 1992.] A reaction to its ubiquitous presence set in after World War II.
Cultivation
This plant is valued for its ability to thrive in the most difficult of garden environments, dry shade. It also copes with pollution and salt-laden coastal winds. It is often seen as an informal hedge, but may also be grown indoors as a houseplant.["...whose measled form is now so common that one hardly realizes that there is also an unspotted Aucuba, which can be quite a handsome bush" (Coats 1992).] this is a female clone, a similar male clone being named 'Maculata'. The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:
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'Crotonifolia'
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'Golden King'
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'Rozannie' – A self-fertile variety not requiring a pollinator, produces deep red berries against solid green, glossy foliage.
Other cultivars include:-
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forma longifolia
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'Mr. Goldstrike' – Male plant with leaves heavily speckled in yellow.
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'Picturata' – Female plant with yellow foliage fringed with green.
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'Petite Jade' – Variety with narrower leaves than other species, slender, and serrated. Solid green, growing to 6 ft. tall (can reach 10 ft. after 20 or more years).
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'February Star' – Female plant with narrow leaves and sparse dots of variegation.
Etymology
Japonica means 'from Japan'.[Gledhill, David (2008). "The Names of Plants". Cambridge University Press. (hardback), (paperback). p 220]
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