History Of The Ginkgo Tree

The Ginkgo Tree: What It Actually Is and Why People Keep Confusing It

The ginkgo is not a conifer. It is not a fern. It belongs to its own division, Ginkgophyta, with no living close relatives. That means every ginkgo tree you see today is the last representative of an entire branch of the flowering plant world that diverged roughly 270 million years ago. Most people who ask about the History Of The Ginkgo Tree are really asking why it looks so weird compared to every other deciduous tree. The leaves are fan-shaped with dichotomous venation. The seeds are not nuts; they are gymnosperm ovules that resemble plum pits. The tree is dioecious, meaning individual trees are either male or female. Only the female trees produce the seeds that smell like rancid butter when they rot on the sidewalk. This is not a metaphor. It smells exactly like that. I have seen landscaping companies charge extra to remove a female ginkgo because the odor complaints from tenants exceeded the cost of replacement.

History Of The Ginkgo Tree

The fossil record shows ginkgo-like organisms appearing in the Permian period, radiating widely across Pangea, and then collapsing to near extinction by the end of the Cretaceous. What survived was probably a handful of populations in isolated valleys in central China. Chinese monasteries kept the species alive through cultivation starting around the Tang dynasty, maybe earlier. The trees were sacred, planted around temple grounds, and never harvested for timber. That protection is the only reason the species exists at all outside of cultivated settings. European botanists encountered the tree in the mid-1700s through Dutch traders at the Nagasaki outpost. Philip Franz von Siebold sent specimens to Europe in the 1830s and published the first scientific description. Carl Ludwig Blume had actually named it Ginkgo biloba earlier, borrowing the Japanese word "gin kyo" from a misread Chinese text. The botanical name has been stable since then, even though the etymology is slightly garbled. By the late 1800s the ginkgo had spread through botanical gardens and then into city streets. It was prized for pollution tolerance, resistance to most pests, and ability to survive in compacted urban soil. That last point matters more than people realize. Most street trees die within twenty years because the soil gets sealed by pavement and construction. Ginkgos keep growing in conditions where maples and elms fail.

I worked on a restoration project once where the original planting plan called for American elms. The soil pH was 8.4, drainage was poor, and the site was next to a salted road. The elms lasted three years. We replaced them with ginkgos and they are still alive forty years later. The spec sheet said the root system was shallow and spreading. It understated how aggressively those roots lift concrete. I had to watch a crew jack up a sidewalk because a three-inch ginkgo root had been pushing against it for fifteen years. The tree was healthy. The sidewalk was not.

How the Species Survived and Spread

Ginkgos are remarkably resistant to pathogens. No serious insect pest attacks them. Fungal diseases are rare. The one exception is anthracnose, which appears mostly in stressed specimens grown in shade. In full sun the leaves are thick and waxy enough that spores struggle to establish. This is why ginkgos became popular during the industrial revolution in cities like London and Paris. The soot and coal smoke killed most other species. Ginkgos did not care. Male clones dominate the urban landscape because female trees produce the smelly seeds. Nurseries selected male cultivars decades ago. The most common ones are 'Princeton', 'Tolstead', and 'Autumn Gold'. They are all clones propagated by grafting or cuttings. This means every male ginkgo on a city block is genetically identical to the parent tree it came from. If a pathogen adapts to one, it can adapt to all of them. That is a real risk and it is why arborists prefer mixed plantings even when aesthetics push toward uniformity. Seeds from female trees do germinate, but the seedlings are highly variable. Some produce better fall color. Some are more drought tolerant. Some grow unusually fast. You cannot predict which trait will express until the tree is established. I once planted thirty ginkgo seedlings from a single female and got three that looked worth keeping. The rest were mediocre. If you want a specific form, buy a grafted clone. If you want to experiment, grow from seed and accept the variance.

What the Fossil Record Actually Shows

Ginkgo fossils are among the most recognizable in the paleobotanical record. The leaves are distinct enough that even fragmentary specimens can be identified to genus. Deposits from the Jurassic and Cretaceous in North America, Europe, and Asia contain abundant ginkgo foliage. There are also fossilized seeds and pollen cones that confirm the reproductive biology matches modern ginkgos closely. The mass extinction at the K-Pg boundary wiped out most ginkgo populations globally. A few persisted in refugia in what is now China. Genetic studies of wild and cultivated Chinese populations show very low diversity compared to other tree species. Bottleneck events are evident. The trees that survived likely did so because they grew in remote mountain valleys where human clearing had not yet reached. The Buddhist connection to temple planting probably amplified that effect rather than creating it. Some researchers have suggested that ginkgo populations in China were deliberately transplanted by humans thousands of years ago, which would explain the current genetic uniformity. The evidence is indirect. Ancient Chinese agricultural texts mention ginkgo cultivation, but dating those references precisely is difficult. What is clear is that the species existed in cultivation centuries before it reached Europe. The monasteries were the reservoir. The traders were the vector.

Why People Think Ginkgo Supplements Work

Ginkgo biloba extract is one of the most studied herbal products in the world. It contains flavonoids and terpenoids that act as antioxidants and affect blood flow. The most common extract is standardized to 24 percent flavone glycosides and 6 percent terpenolides. That is the ratio used in nearly every clinical trial. Studies on cognitive function show mixed results. Some suggest modest benefit in patients with dementia. Most show no effect in healthy adults. The safety profile is reasonable at recommended doses. The main risk is bleeding. Ginkgo inhibits platelet aggregation. If you take it with aspirin, warfarin, or NSAIDs, the risk increases. I have seen case reports of subdural hematomas in elderly patients who combined ginkgo with blood thinners without telling their doctors. That is the kind of interaction that matters more than the advertised benefits. Wild-harvested ginkgo seeds contain a toxin called ginkgotoxin, also known as methyltegolic acid. It can cause seizures in high doses. Commercial extracts remove this compound during processing. If you are ever tempted to roast and eat raw ginkgo nuts, which some East Asian restaurants serve, limit the quantity. A handful is probably fine. Dozens can make you sick. I learned this from a colleague who tried a cooking experiment and spent the night in urgent care. The medical staff were not impressed.

Growing One: The Practical Reality

Ginkgos are easy to grow from seed if you have the space. The seeds need cold stratification. Scarify the hard outer layer, soak them for twenty-four hours, then plant them in a cold frame or refrigerator drawer with damp sand for eight to ten weeks. After that, plant them outdoors in spring. Germination usually takes two to six weeks. The seedlings grow fast. Expect six to twelve inches of growth in the first year under good conditions. Transplanting larger trees is more work. Ginkgos do not tolerate root disturbance well. Balled-and-burlapped specimens up to three inches in trunk diameter will establish if you water them deeply and mulch the root zone. Container-grown trees are easier to move because the root ball stays intact. I prefer container stock for street planting. The survival rate is higher and the establishment period is shorter. Pruning is straightforward. Ginkgos tolerate heavy cuts and redirect growth readily. Structural pruning in the first five years prevents the common problem of weak branch crotches that split under ice or snow load. After that, the tree maintains itself fairly well. Pests are rare. Diseases are rare. The main maintenance issue is seed drop from female trees and root heaving under pavement. Both are manageable if you plan for them during installation.

The tree has been around longer than written human history. It survived ice ages, asteroid impacts, and industrial pollution. It outlived the forests that surrounded it. That is not a poetic claim. It is the literal fossil record and the living population data. The species persists because it is physiologically flexible and biologically uninteresting to anything that eats plants. Herbivores avoid it. Pathogens ignore it. Humans moved it across continents. It keeps growing in places where other trees give up.