There's a lot of gratitude being expressed towards trees these days. The gratitude tends to be towards trees in general, but this fall, I'm especially grateful for three trees in particular.
News from the preserves, parks and backyards of Princeton, NJ. The website aims to acquaint Princetonians with our shared natural heritage and the benefits of restoring native diversity and beauty to the many preserved lands in and around Princeton.
Friday, October 27, 2023
Update on Native Butternuts and Chestnuts in Princeton
Sunday, October 15, 2023
Lorenz Hiltner--Plant Scientist and Potential Relative
"Hiltner became convinced that root exudates of different plants support the development of different bacterial communities. His definition of the rhizosphere in the year 1904 centered on the idea that plant nutrition is considerably influenced by the microbial composition of the rhizosphere."Lorenz Hiltner was part of the great European tradition of cutting edge research that was the envy of American scientists early in the 20th century. In researching the lives of my "adopted ancestors", American mathematician Oswald Veblen and atomic physicist Walter Colby--both of whom traveled frequently to Europe as the century began, wishing to emulate the great institutions of learning they found there--I see a contrast in trajectories. As the U.S. rose in prominence and innovation, European scientists became increasingly hampered by political conflict and instability, even before the Nazi rise and WWII.
"In the centennial symposium of Hiltner’s definition of the “Rhizosphere” in Munich in September 2004, more than 450 scientists gave tribute to his founding work on the rhizosphere and presented studies that continue on many of the ideas first brought to light by Hiltner."
Sunday, September 17, 2023
Last Chance to Pull Stiltgrass
More on Stiltgrass, and a Success Story
Walking in the local woods, you've probably seen this kind of scene--what looks like a grassy meadow extending through the forest. In the filtered light of the understory, its simplicity and lushness may have some visual appeal. And yet, in some ways what you are looking at is the ecological equivalent of an urban food desert.
Stiltgrass is an introduced plant that could be called a pervasive invasive, able to thrive most anywhere and dominate whole landscapes. Its success has come in part through being inedible. As wildlife selectively eat native vegetation, the stiltgrass expands, preventing the native plants from rebounding.Though stiltgrass has covered large areas of woodland in the eastern U.S., we have found it worthwhile and even satisfying to counter its relentless incursions. Today in the Barden at Herrontown Woods, some volunteers pulled it out of a patch of native jewelweed along the edge of the parking lot.
Saturday, September 16, 2023
Where Have All the Spotted Lanternflies Gone?
Well, it's happened, at least in our neck of the woods.
It's true that people gave themselves over to squashing the pesky bugs--leafhoppers, actually--in spirited ways. (This photo shows one of the more creative approaches.) Some think the unusual weather has had an effect. Insect numbers overall have been down, be it the pollinators on backyard flowers, the odorous house ants that used to invade our kitchen, or spotted lanternflies. But my guess is that it has been the full-time predators, feathered or with eight legs or six, that are to be most congratulated for stemming the explosion of spotted lanternflies.
Just follow the trail of colorful wings that brightened a walk up towards Veblen House one day.
Thursday, September 14, 2023
Yew Berries and Dewberries
Yewberries
I've passed by this yew hedge on busy North Harrison Street thousands of times, and usually pay it no mind.
But a couple days ago, I happened to be looking down at the sidewalk rather than the gazillion cars and trucks driving by, and saw something that caught my eye.
Thursday, September 07, 2023
Pilewort--A Native Weed With Hidden Flowers and Showy Seeds
Some plants have it all backward. Flowers are supposed to provide the show; the seeds, not so much.
But with pilewort, its the seeds that catch the eye, clustered in raggedy bunches that look like cotton.Tuesday, September 05, 2023
Obedient Plant: Big Pink in a Season of Yellows
Among sun-loving native flowers of summer, the so-called obedient plant shows up all fresh and fulgent just as the party is starting to wind down. Each year it catches me by surprise with its pink when so many other flowers--sunflowers, cutleaf coneflowers, Silphiums, Heleniums--go with yellow.
Obedient plant (Physostegia virginiana) is also off my radar because it is risky to plant. Its tubular flowers may obediently remain sideways if you push them, but the plant itself spreads aggressively underground. Not surprisingly, it's in the mint family, known for roots that spread hither and yon.That's why this gardener on Grover Ave was so smart to plant it between a sidewalk and the road, where its capacity to spread is limited.
A similar strategy to curb its spread was used in front of Jay's Bike Shop.Wednesday, August 16, 2023
Princeton's Fuel Tank Raingarden Threatened By Lack of Early Intervention
A couple years ago, the town planted this raingarden next to the fuel tank on Witherspoon Street. They put in some pretty cultivars of showy native species like black-eyed susan, purple coneflower, and St. Johnswort, then mulched it all carefully. Everything looked under control, as gardens do when they are first planted.
Even this summer, with flowers blazing, it looks like a success.But I can see that the seeds of its ultimate demise have already sprouted. This botanical drama has played out many times before--raingardens that failed for lack of strategic intervention when aggressive weeds started to move in.
Most deadly is the mugwort that has become established and is quickly spreading. That one invasive species alone could obliterate the intended plants in a few years.More easily dealt with are the ragweed--a native weed with allergenic green flowers--
a flamboyant patch of crabgrass, and what looks like a patch of black medic. The mulch laid down two years ago surely helped, but its capacity to stifle weed growth clearly didn't last.
Cindy Taylor, Princeton's First Open Space Manager, Moves On
It was a brief but extraordinary tenure for Princeton's first Open Space Manager, Cindy Taylor. Her hard work and accomplishments made abundantly clear the importance of the open space manager position in town government, validating the view of all of us who fought long to have the position created, and the wisdom of the current council in funding it.
Cindy served as primary contact within town government for the nonprofits that take care of Princeton's open space at Marquand Park, Mountain Lakes and Herrontown Woods. Among her many activities, she compiled an inventory of open space in Princeton, worked with the Environmental Commission on updating the Environmental Resource Inventory, and helped apply for habitat restoration grants. In my many communications with her, I would have to say she was impeccable, sending us detailed notes from meetings, and attending quickly to our various requests.After a year and a half on the job, she is leaving for a job in Mercer County open space. We thank her for setting such a high standard of public service.
(Photo plucked by TapInto Princeton from a zoom video of a council meeting)
Friday, August 11, 2023
The Invasive Grass Fueling Wildfires in Hawaii
Hawaii didn't used to get pummeled by highly destructive wildfires. What has changed? A big part of the answer lies in the interaction between climate change and invasive species.
Begin with a couple paragraphs buried in a NY Times article:
The area burned annually by wildfires in Hawaii has quadrupled in recent decades. Declining rainfall and rising temperatures have left the islands more susceptible to blazes, climatologists say.But what invasive species? A University of Hawaii website points to one that has been particularly destructive:
Invasive grasses that are highly flammable have crowded out native vegetation in some areas, and climate change has exacerbated dry and hot conditions in the state, allowing wildfires to spread more quickly.
Guinea grass (Megathyrsus maximus), a nonnative invasive grass in Hawaii, forms dense stands that outcompete native plants and has very high fine fuel loads that greatly increase fire potential, spread, and severity.
Wikipedia describes guinea grass as a tough customer, growing ten feet tall. Though it can thrive in full sun, it can also tolerate shade, allowing it to invade native woodlands and thereby increase their vulnerability to fire during droughts. Native to Africa, the grass was introduced not only to Hawaii but also to south Texas.
How did guinea grass get to Hawaii (also spelled Hawai'i)? Wired provides an answer:
When Europeans arrived in the late 18th century and established plantations for growing sugarcane and pineapple, they also brought invasive grasses. Now the economics have changed, and those fields lie fallow. But the grasses have spread like a plague. “Those fire-prone invasive species fill in any gaps anywhere else—roadsides, in between communities, in between people’s homes, all over the place,” says Pickett. “At this point, 26 percent of our state is covered in these fire-prone grasses.”An article in ABC News explains how the more intense and frequent fires affect the soil and human health:
This stuff is highly sensitive to short-term fluctuations in rainfall. The grass will grow like crazy when the rains come, then quickly desiccate when the landscape dries. “When we get these events like we’re seeing these past few days—when the relative humidity really drops low—all those fine fuels become very explosive,” says fire ecologist Clay Trauernicht of the University of Hawaiʻi at Mānoa.
Elizabeth Pickett, co-executive director of the Hawaii Wildfire Management Organization, a nonprofit working with communities to prevent and mitigate fires, lamented the changes wrought by fire.A Philosophical Footnote
Invasive and fire-prone grass species have moved in over time and during a fire they can burn into native forests, which means the forests are replaced by more grass, Pickett said. The soil burns and sloughs off, leading to massive post-fire erosion that smothers coral, impacts fisheries and reduces the quality of the ocean water, she said.
The state is windy and the dust blows for years, harming human health, she added.
“When you lose your soil, it’s really hard to restore and replant. And then the only thing that can really handle living there in many cases are more of those invasive species,” Pickett said. “It’s systemic. Air, land and water are all impacted.”
Friday, August 04, 2023
Four Kinds of Honey Bees in Northern Thailand
There's the honey we're familiar with, and then there's another one that tastes like apricot jam. A third, produced by the stingless bee, has a fermented fruity flavor like Kambucha.
The asian honey bee (Apis cerana) produces less honey than our honey bee, but is much easier to take care of.
A Brief Account of Life in a Mountain Village in Thailand
Their first night in the village, they were surprised to be awakened at 3:30am by the robust crowing of roosters, so raucous that the whole village has little choice but to rise and begin its day. Chickens run loose, apparently free of local predators that might consume them before people have a chance to. Once a year, a tiger passes through the area, apparently without raising much concern.
The town runs on solar energy, but lest one think this mountain village an idyllic integration of humanity into nature, daytime brings cooking fires and the burning of refuse. The villagers are conditioned to the resulting stew of smoke that can linger in the valley, but it registered as noxious and toxic to Anna.
Some of the refuse is plastic, which we're all told releases toxins when burned. What plastics do the villagers have if they grow their own food and have few possessions? Though they cook delicious meals most days, there are times when villagers may not feel like cooking, and so pull out store-bought noodles and tomato sauce, the plastic wrappings from which end up getting burned in the refuse pile.
This is not much different from my own experience growing up in a small village in Wisconsin in the 1960s. One of my chores was to burn the garbage, plastic and all. In autumn, we'd rake some leaves into piles to jump into, and others into piles to burn. We'd toss acorns into the glowing core of the fire and wait for the popcorn-like explosion. On brisk, sunny fall days, the whole village became suffused with what registered as a sweet and endearing aroma of burning leaves. Even after moving to a city, the 1930s house we moved into had an incinerator in the basement for burning trash. And in the 70s and 80s, when I played jazz gigs in smoke-filled bars, it was not until the next morning that I'd notice the wretched smell of stale smoke in the clothes I had worn.
There have been efforts to promote cleaner air in remote mountain villages around the world. Some students, before entering Princeton University, sign up to spend a "bridge year" in a foreign country doing good deeds, one of which is helping build cleaner burning stoves for villagers in Peru and elsewhere. You'd think the villagers would be grateful for a home less choked with smoke, and maybe they are, but the capacity of the body to become conditioned to abuse is both impressive and exasperating.
Lots of interesting reading out there on bees. Here's some info about eight species of honey bees around the world.
Thursday, August 03, 2023
The Pleasures of American and European Elderberries
One of my favorite shrubs, the elderberry, took on new facets and dimensions this year.
When I was a kid, we'd drive out to the countryside and harvest its berries, clustered on broad disks. What they lacked in size they made up for in numbers. Brought home in big brown paper grocery bags, they were soon on their way to becoming delicious jelly and pies. We made jelly out of wild grapes, too, but elderberries had a flavor all their own. It took a little time to strip all those small berries off the stalks, but the reward lasted all year.Our friend Joanna served as mentor and activator, directing us to pick the clusters when all the flowers were open but still fresh. For best flavor, one website suggests picking the flowers in mid to late morning.
Some Caution
Some recipes are less concerned than others about including any fragments of the green stems, which are toxic. Only the flowers and the cooked ripe berries are edible. We stripped the petals off the stems by hand, which is time consuming but delivers good results.
Making the SyrupOne bit of news from the turbulent, restless world of scientific nomenclature: the elderberry has been uprooted from its long-running membership in the Caprifoliaceae family and now rubs phylogenetic branches with Viburnums and a couple other genera in the Moschatel family, also known as the Adoxaceae.
A Curious Variety of European ElderberryWednesday, July 19, 2023
Monarch Butterfly Update -- July, 2023
How many monarch butterflies are people seeing this year? I've seen a grand total of two thus far. Neither paused for a photograph, so this picture is from a past year.
On July 11, I saw one flying crazily at the Barden. They are expert and often seemingly whimsical flyers, but this one's flight was unusually frenetic. At double the usual pace, it would approach flowers but not land on them, leading me to speculate that it was looking for a mate rather than nectar. A useful Q&A post at JourneyNorth.org suggests that these episodes of particularly erratic flight are induced either by a predator's attack or by a male chasing a female. But the frenetic flight made me instead imagine what it is like for monarchs when their numbers are few, and the search for a mate consumes more and more of their energy. Might a fruitless search at some point become frantic?A few days later, I saw a monarch in a pasture near Herrontown Woods, flying at a more measured pace.
There were a few common milkweeds growing in the pasture, but I was particularly happy to discover a couple specimens of green comet milkweed (Asclepias viridiflora), growing there as well. It's a species I've only seen twice in Princeton, the other incidence being a few individuals in the Tusculum grasslands."As applied in this case, extinction refers to the loss of the monarch migration and not the species per se. Given the link between the increase in greenhouse gas emissions and increasing temperatures and the world’s slow response to these changes, yes, the monarch migration will eventually be lost."
It's important to note that those who raise alarms about the climate crisis are the optimists. It is optimistic to face up to a grave risk, and call for action to save what will otherwise be lost. Denial and dismissiveness are rooted in pessimism. They take a gloomy view of 1) our capacity to recognize dangers and 2) our capacity to act collectively to prevent catastrophe. Taylor's recognition of the high likelihood that we will lose the migration raises an obvious question, which he hastens to answer.
"If the monarch migration will be lost eventually, why make great efforts to sustain it? Faith. We have to have faith that the world will come to its senses and work collaboratively toward the reduction of greenhouse gases to save the natural systems that sustain us. There is hope. The rate of increase in CO2ppm has declined in recent years."
Another answer is that, the longer the migration can be maintained, the longer humanity has to "come to its senses."
It is stunning, knowing the extraordinary power of carbon dioxide to influence the earth's climate, that society has left it unregulated. As individuals, cities, and businesses, we remain free to pour as much of it as we please into the atmosphere. Until that giant hole in our regulatory protections is patched, the vast majority of people will not change their behavior.