I love ginkgo trees so much that for my birthday one year, I asked my husband for a tree. It’s been growing steadily for four years, and now it’s going to contribute to climate science!
I joined up on the National Science Foundation’s “Fossil Atmospheres” project, which combines contributions from citizens and scientists from the National Museum of Natural History and the Smithsonian Environmental Research Center to conduct climate change research. The project needs citizens around the US to send leaves and photos of ginkgo and to enter data about the tree into a database. (See Fossil Atmospheres for more info.)
Ginkgo are native to China and are the among most ancient trees on earth, little changed from the days when dinosaurs munched on their leaves. Because they are so ancient, they provide a great fossil record for comparison with modern trees.
You’d know a ginkgo if you ever saw one – they are the only tree on earth with a leaf that remotely looks like this (and yes, I have read a whole book about ginkgo).
It’s hard for even the most callow citizen scientist to misidentify one. If you do, some ginkgo in public gardens and parks will have labels, like this one, on another ginkgo in a park near my house:
I wanted to send in at least two samples, so I sampled my little tree and also a very large, older tree that sits on the grounds of the public library near my house.
I love looking at this tree – which I call “Grandma Ginkgo” and imagining what my little tree might look like in 100 years.
The project requires you to take a few samples, photos and observations. You need to take one cluster of at least six leaves off each tree to be sampled. You must cushion the leaves inside a few sheets of newspaper and then reinforce the bundle with cardboard, so the samples don’t get damaged in the mail.
You also need to note the sex of the tree. Yes – ginkgo are male or female. Most trees you see around are male, because people usually don’t want to deal with female trees’ stinky fruit. The fruit covers a nut that some people find delicious. I have never tried it but I promise to this year (it involves a lot of prep work and can be toxic in large doses, so there are other issues besides the smell). Here’s what a developing fruit looks like (courtesy of Grandma Ginkgo). It turns golden yellow when ripe:
You also need to note what side of the tree the sample came from (north, south, east or west) so the scientists can adjust for sun exposure. And you note the approximate height of the tree – 10-30 feet or 30+ feet.
Here are some other fun facts about ginkgo:
- The oldest specimens are over 2,500 years old, making them among the oldest living things on earth
- In the fall, the leaves turn a lemony yellow color. All the leaves drop in one day.
- The first European visitors to China took home ginkgo seeds to plant in the UK, the Netherlands, France, and Germany
- They’re among the most popular street trees in Manhattan – accounting for about 10% of all trees there
- The leaves and nuts have many medicinal properties
And here are some gratuitous photos of some of the ginkgo motif items in my own home. What can I say? I am a nut for ginkgo!
If you want to participate in this project, follow the directions at Fossil Atmospheres and get your samples in by September 1!