During the time of the dinosaurs seed plants (spermatophytes) were well developed and were the most dominant vegetation on earth, especially the lush seed ferns, conifers and palmlike cycads. These primitive seed plants are called gymnosperms (meaning "naked seeds") because their seeds are not enclosed in a ripened fruit but are protected by cones or by a fleshy seed coat.
|Most gymnosperms (and flowering
plants) have both sexes on the same plant, but the Ginkgo is a dioecious
gymnosperm, male and female are separate trees, its seeds have a fleshy
The Ginkgo and the cycads are the only living seed-producing plants that have motile or free swimming sperm (more info here).
In earlier classification systems the Ginkgo
tree was placed in the class Coniferopsida, because it is thought to be
more related to conifers than to any other gymnosperm, but the two groups
appear to have evolved independently.
Green algae (Coccomyxa) live in symbiosis with
Ginkgo tissues, recent research has shown. So far this association is not
known on any other tree and only occurs in the animal kingdom.
old Ginkgo in Japan
photo Hiroshi Takahashi
||You can distuinguish a Ginkgo from other gymnosperms by its fan shaped and bilobed leaves. All Ginkgo trees have a relatively primitive vascular system. The veins continuously divide into two's. This vein pattern (dichotomous venation) is unique to the Ginkgo.|
Because of its unique position botanists found
it difficult to classify the Ginkgo. Therefore the Ginkgo has been placed
in a separate group in recent years, the division (phylum) Ginkgophyta.
This division consists of the single order Ginkgoales (Engler 1898), a single family Ginkgoaceae (Engler 1897), a single extant genus Ginkgo.
Click here for the classification scheme
There are two extinct genera: Ginkgoites and Baiera (known from fossilized leaves).
The only living representative of the order Ginkgoales is the Ginkgo biloba.
A Ginkgo tree can reach about 30 sometimes 40 metres (100 feet) height and a spread of 9 metres. The trunk can become about 4 metres (13 feet) wide in diameter (in open areas much larger; near temples 50 m with girth 10 m grow!) and is straight columnar and sparingly branched. Some trees are very wide spreading, others are narrow.
Young trees have a central trunk, pyramidal in shape, with regular, lateral, ascending, asymmetrical branching and open growth. Older trees have an oval to upright spreading growth and sometimes irregular branching and tremendous sized limbs and trunk. When about 100 years old its canopy begins to widen.
The male tree usually has a slim column form and is slightly longer, the female tree has a wider crown and a more spread out form.
chichi on 'Tenjinsama no ichou', girth 10 m
Aomori Prefecture, N. Honshu, Japan
Photo © Hiroshi Takahashi
|The Ginkgo has long and short
at nearly right angles. A short branch may become a long branch and the
tip of a long branch may change into a short branch. That's why older trees
may have a more irregular form. The buds are mounded with distinct form
and leaf scars. The leaves grow alternate on the long branches during spring.
On the ends of short, lateral shoots they grow very slowly in clusters
and produce a long shoot with scattered leaves after a number of years.
The short shoots also produce the seeds and pollen. The stems are tan,
light brown or gray, relatively smooth and are somewhat reflective in the
winter sun. Some trees tend to have branches crossing the trunk.
The girth of the trunk of the older trees may become large because of secondary growth. The tree usually loses its central leader and gives rise to several vertical trunks ("basal chichi") that keep reaching great heights. These socalled lignotubers can also be observed on the Sumter plantation (see Usage-page) where the trees are regularly cut down to groundlevel and produce lignotubers that give new shoots and roots.
buds and bark
Video I made of an old Ginkgo tree
at Maldegem (Belgium), c. 1840, female, with chichi
The Ginkgo also produces peg-like structures (chi-chi = nipples, sort of "aerial" lignotubers) along the trunk and branches that can grow into the ground and form roots as well as leafy branches above because of the embedded vegetative buds, which is characteristic only for the Ginkgo. The chichi (Chinese: zhong ru) seem to be connected to traumatic events, environmental stress and individual properties of a tree. It is seen with old, but also with younger trees. It is thought the chichi, its resistance against diseases, its adaptability and individual properties of the tree etc. contribute to the long history of the survival of the Ginkgo.
Inside the trunk the wood is yellow.
The bark is light brown to brownish-gray; more brown, deeply furrowed and ridged on older trees and has a corky texture.
click picture for enlargement
and more photos of the wood
|As said before although the Ginkgo is more like a conifer than a deciduous broadleaf tree it is neither, it has a unique position. This also becomes clear when looking at the microscopic structure of the wood. It lacks vessels in the xylem but has slightly rounded tracheids giving rise to intercellular spaces (conifers have regularly close-fitting rectangular tracheids). It has beautiful crystals (called druses) consisting of calcium oxalate.|
|The leaves are an easy recognizable feature of the deciduous Ginkgo biloba. They are 5- 8 cm wide and are sometimes twice as broad although they vary in size and shape. The leathery leaves have a wax layer on both sides and are slightly thicker than other Northern tree leaves. They consist of a leaf stalk and a fan-shaped dichotomously veined blade: two parallel veins enter each blade from the point of attachment of the long leafstalk and divide repeatedly into two's (picture click here) , are not often cross-connected (seldom fuse). The veins are slightly raised giving a ribbed appearance. The pores are recessed and limited thereby reducing waterloss from evaporation. The form is bilobed, it has no midrib and is fan-shaped. The leafstalk is also about 8 cm (3 inches) long causing the foliage to flutter in the slightest breeze.||
- GINKGO LEAVES :
|The leaf resembles the leafshape
of a Maidenhair fern (Adiantum), hence the plant's nickname, the Maidenhair
A deep vertical slit in the top center divides the leaf into two lobes mostly on the upper part of long branches. The leaf can also have more than two lobes, esp. on the lower part of the tree. There is great variation in the degree of lobing on the same tree and this also seems to vary from tree to tree.
The colour is gray-green to yellow- to darkgreen in summer, turning in yellow and in good years a beautiful golden yellow colour in fall. Certain selected cultivars yearly have this golden yellow colour in fall.
|The leaves remain
on the tree until late in the season and then can all fall rapidly in a
single or a few days and even in 1 or 2 hours!
HD-Video: Ginkgo in fall in Amsterdam.
Slideshow: Ginkgo in fall impressions.
The form of a butterfly resembles a Ginkgo leaf.
The extract of the dried leaves is popular for their use as a diet supplement and/or herbal medicine (prescribed in Europe) for the brain, legs, eyes, heart and ears. Scientific studies show that good extracts may improve bloodcirculation and memory, prevent bloodclotting, damage by free radicals and give an improved sense of well-being and can be used for many other disorders. The leaves are also used as tea for a variety of ailments.
The fungus Bartheletia paradoxa is a living fossil like Ginkgo biloba and grows on fallen Ginkgo leaves (it is not present on leaves on the tree), it does not grow on other plant species.
Read more about this on my Usage-page.
Climate zones 3 to 9 (-30/40 to +20/40 C). So from Iceland to Australia, read my Where-page.
Nearly every arboretum or botanical garden will contain specimens. The supreme specimens are to be found on temple grounds in China, Korea and Japan. In China they also grow in forests and valleys on acidic, well-drained sandy loam (pH 5-5.5) and they are cultivated below 2,000 m (see Where-page).
Ginkgo has survived in some areas of China where the impact of glaciation was minimal. Populations of Ginkgo biloba are found across the country, but are generally associated with human activities.
Questions about the extent of Ginkgo biloba’s native range in China have been the subject of debate among botanists for well over a hundred years.
DNA analyses (Literature-page) have demonstrated that isolated Ginkgo populations in southwestern China, especially around the southern slopes of Jinfo Mountain (Jinfo Shan) of Nanchuan County at the boundary of Chongqing Municipality and Guizhou Province (28°53'N; 107°27'E) possess a significantly higher degree of genetic diversity than populations in other parts of the country. Southwestern China was less affected by cold air from Siberia during the glaciations.
The area has a mesic, warm-temperate climate with a mean annual temperature of 16.6°C and a mean annual precipitation of 1185mm, with Ginkgo trees growing mainly between elevations of 800 and 1300 m. The largest Ginkgo tree was estimated to be 2500 years old with a mean diameter of 3.69 m at breast height.
click photo to enlarge and to view more photos
|Ecological work in this area,
as well as in adjacent parts of Guizhou Province, has identified numerous
small populations, for instance in Wuchuan County and Tuole, that can be
considered to be either wild or remnants of wild plants, despite their
proximity to small villages practising subsistence agriculture. Both the
Jinfo Mountain and Wuchuan County populations are situated to the east
of Mt Dalou. This region has the greatest biodiversity in China due to
the relatively stable environment and diverse topography.
Evidence for the persistance of wild Ginkgo biloba (Ginkgoaceae) populations in the valley and lower mountain slopes of the Dalou mountains in southwestern China was published in 2012 (Tang et al.). More info and photos.
The Ginkgos on West Tianmu Mountain, which were previously considered to be wild by many researchers, may, instead, have been introduced by Buddhist monks. However, more research is needed.
For places where the Ginkgo has a special growing spot see the page Where on my homepage.
The Ginkgo can have a long life span, 1,000 or older. In China the oldest Ginkgo is about 3,500 years old!
The majority of ginkgos live as a hardy ornamental tree and, being nearly cosmopolitan, specimens are planted around the globe in almost any temperate and subtropical areas. In the USA only 0.2-2% of the total number of roadside trees is a Ginkgo, in Europe this is even less (1992). The tree is farmed extensively (esp. for its medicinal use as a herb) in Europe, Japan, Korea and the USA.
In China Ginkgo trees of more than 100 years old are listed as second class protected plants of the state. Roads and buildings should give way in order to protect them well.
Some people think there's a good opportunity
to plant a Ginkgo tree on special occasions like the death of a beloved
one, the birth of a child, an anniversary, moving house etc.
prefers full sun to partial sun and moist,
deep, well-drained soils
loam), but is very adaptable, so it also grows in poor soils, compacted
soils, various soil pHs, heat, drought, salt spray in winter and air pollution.
1-2 times a year. Don't mulch with shredded bark round the trunk, keep
it airy. It roots deeply (photos of root system).
The roots of most Ginkgos are infected by vesicular-arbuscular mycorrhizae
(VAM) that play an important role in the uptake of the element phosphorus.
|The Ginkgo tree is particularly
resistant to insect pests and to fungal, viral and bacterial diseases as
well as to ozone and sulfer dioxide pollution, fire and even radioactive
radiation (atom bomb WWII). Therefore it is used as a street tree, esp.
in cities, it never needs spraying.
It can tolerate snow-and icestorms. Research showes that the Ginkgo has no trouble adapting to greenhouse-effect conditions (elevated CO2).
It is also planted as a park and landscape tree and in gardens.
It is also grown for its shade (little shade when it's young). It is particularly easy to establish in the garden.
It initially grows somewhat slowly: it takes 10 to 12 years to become 6 metres (20 feet) tall and it takes about 20 years before it has a rounded shape.
It can be trained as an espalier (photos), hedge or climber.
Playlist videos of the Ginkgo as a street tree.
Midousuji Boulevard, Osaka, Japan
900 Ginkgo trees of 1937 in a row of 4.5 km
Photo © Sando Tomoki
|Plant in spring or fall. Young
trees tend to grow crooked and should at first be staked. Give plenty
of water (more during dry/hot periods) until they are about 6 metres
It is slow to recover from transplanting.
In favourable conditions the Ginkgo grows from
about late May to the end of August over 30 cm per year for the first 30
years of its life. In some years it doesn't grow at all, in others 1 metre
of growth can occur, independent of watering or nutrients.
The tree needs no pruning.
the tree is dioecious, male and female trees are separate. The sex
chromosomes (XX females and XY males, just like humans) are difficult
to distinguish, so the tree's gender is not easily classified.
The pollen and ovules grow on the short spurts, very seldom on the leaves (Ohatsuki). Occasionally both genders are found on the same tree.
After a hot summer or grown in a warm sunny
position the tree produces them more reliably.
Ohatsuki ovule. More photos of old tree in Japan and ohatsuki leaves.
Ohatsuki pollen remain small
photo © Hiroshi Takahashi
They look like cherries. It takes about 20-35 years before they appear for the first time in spring. Catkin-like pollen cones (microsporangia) containing the sperms on the male tree also grow on short shoots in spring (also after about 20-35 years) and the pollination usually takes place via the wind. The female tree can carry seeds without pollination (sterile). Variations in the cycle of pollination, fertilization and seed abscission in Ginkgo are mainly due to the latitude and the local climate of the region in which the tree is growing.
|When the ovules are fertilized they develop into yellowish, plumlike seeds about 2,5 cm (1 inch) long, consisting of a large "nut" (the size of an almond) with a fleshy outer layer. The actual fertilization of the seed by free swimming sperm occurs mostly on the tree (read more here).||
The propagation can also be done by cuttings (the best way to ensure the gender) or by grafting a female branch onto a male plant or visa versa.
Read further about this on my Propagation-page.
The fresh nutritious seeds (also canned with fleshy outer coat removed) are sold in markets esp. in the Orient.
The "nut" has for long been used in Chinese medicine for asthma, coughs with thick phlegm, bronchitis, digestive aid and urinary incontinence etc.
Read further about this on my Usage-page.
I made a special page about the Ginkgo as a bonsai tree.
Click here to go there.
HD-video: one of
the oldest Ginkgo trees outside Asia
Geetbets, Belgium, c. 1750
follow me on Twitter
Many garden centers sell the Ginkgo biloba.
Special cultivars are for sale at nurseries.
The Ginkgo can often be found in the conifer catalogue (check out my Links-page and/or try search engines). Male trees are often propagated from cuttings. Always buy from a reputable firm. Of course I would very much like to have male and female trees in my own garden, but I only have space for one big tree....
If you have a suitable spot then please plant a female tree or grow Ginkgos from seed (can become male or female tree), because they are so rare and when only male Ginkgos are planted it cannot survive without human intervention.
The Ginkgo is listed in the IUCN Red List of Endangered Plants.
The Ginkgo tree can grow large, therefore it is not the tree for every backyard. Selections are made to make it suitable for places with less space and also to meet with desired shapes etc. Upright, dwarf, narrow and conical, pendulous and variegated cultivars exist, search for them on the internet, ask for them at garden centers and nurseries. Cultivars are mentioned below (but no doubt there will be many more).
'Anny's Dwarf': dwarf form
'Autumn Gold': better fall colour and/or modified broad spreading growth habit, compact form, male.
'Barabits Nana': small bushy form, up to 2 metres.
'Beijing Gold': shrub form, 4 m, yellow leaves also in spring and summer ( in summer somewhat striped)
'Bergen op Zoom': small straight up to 4 metres.
'Chase Manhattan': small, tiny darkgreen leaves, compact, ideal for bonsai and rockgarden, 1.5 m
'Chichi (Icho)': smaller leaves and a textured trunk, bark has breast-shaped protuberances
'Chris's Dwarf' (or 'Munchkin'?): see 'Munchkin'
'Chotek': weeping form of 'Witches Broom'; cultivar from Czech Republic; found by Mr Horak, Bystrice pod Hostinemin. Named to tribute the house of Choteks, the family of archbishop F. M. Chotek.
'Eastern Star': female, bears abundant crops of large nuts.
'Elmwood': vertical columnar form
'Epiphylla': female. Max. 4 m h., more wide. Seeds form on rather young plant.
'Elsie': upright growing, female.
'Fairmount': slender form, big leaves, dense pyramidal crown, male, 15 m.
'Fastigiata': architectural vertical accent, nearly columnar form, slightly wider at the base, big leaves, male (also available as female).
'Geisha': female, long pendulous branches and dark green foliage which turns lemon-yellow in fall, heavy crops of large nuts.
'Globosa': Graft on stock, bulb-shaped, compact
'Globus': Bullet-form, big leaves.
'Golden globe': Full head and spectacular yellow fall color. Trees are unusually densely branched for Ginkgos. Young trees have full crowns that mature in a broad, rounded head. Male. (from a seedling of Cleveland Tree Co. )
'Gresham': Wide spreading horizontal branch habit. (from Gresham High School Ginkgos at Gresham, Oregon)
'Heksenbezem Leiden' (Witches broom):
quite compact, rounded, dwarf form, branching closely grouped,
up to 3 metres.
tall and wide form, many side-branches.
'King of Dongting': slow growing, very big leaves.
'Liberty Splendor': broad pyramidal form with strong trunk, female.
'Long March': Upright growing, female is cultivated for heavy crops of tasty nuts.
'Magyar': uniform symmetrical branching, upright narrow pyramid form, up to 19 metres, male.
'Munchkin' (or 'Chris's Dwarf' ?): Upright
habit and numerous slender branches, it has a tendency to be more
regular in shape.
'Ohasuki': up to 4 metres, halfround big leaves, female.
'Pendula': branches more or less pendulous ("weeping"), slow growing, decorative.+ video
'Prague or Pragense': low spreading and parasol-shaped.
well known cultivar, slow growing, big decorative leaves, upright conical
form gives very formal focal point, male, 30 m.
'Rainbow': striped with green/yellow leaves, about 3 m. Improved 'Variegata'. Remove green leaved branch immediately.
'Salem Lady': female from Oregon.
'Santa Cruz': female, low, spreading, umbrella-shaped.
'Shangri-La': fast growing with compact pyramidal form, 14 metres, grows somewhat faster, male.
'Spring Grove': dwarf, very small and compact, about 3 m.
'Tit': = Chichi (Icho).
form with variegated foliage, some leaves 'halved' green and gold,
others striped and others half gold/half striped, up to 3 metres, female.
'Windover': broad oval outline, shade tree, 17 m.
can also be grown as a bonsai
HOME - INDEX
© Cor Kwant