A growing number of people are taking an interest in herbal medicine. Why learn herbalism now? For many, it is a way to deeply learn and lean into the nature right outside their door. Further, learning how to identify, prepare, preserve, and use medicinal plants helps you take health into your own hands. A lot of people who live in the US (especially in rural areas) recognize that healthcare is more costly and more difficult to access: it is harder than ever to keep a family doctor or get specialist care, and it is so costly that a lot of people can’t afford visits, tests, or medicines.
If you’d like to join us on August 30 or August 31 for an exciting day of ecology and geology, you can register here. These outings are great opportunities to explore beautiful ecosystems while learning tree identification, mushroom identification, forest history, geologic influences on plant communities, and much more.
I’d love to see you there!
And now on to the new video…
Are pawpaws neurotoxic?
It sounds like an absurd question to ask. After all, many people eat these wild fruits every year without experiencing any apparent negative effects.
But let’s consider the following pieces of information:
Studies have linked the consumption of fruits in the Annonaceae family to neurodegeneration in humans. Pawpaw, it turns out, is in the Annonaceae family.
A compound isolated from pawpaws is neurotoxic in laboratory studies.
And a case report from 2020 describes a man who developed a possible variant of a neurodegenerative disorder called progressive supranuclear palsy. The man was known to eat lots of pawpaws.
Of course, none of this information is conclusive, but it does make some people wonder. Are pawpaws neurotoxic? Should we avoid eating them? Or is this issue overhyped?
I’m excited to announce that I’ll be leading a series of forest ecology outings, and I’d love for you to join me!
On August 30 and 31, 2025, I will be leading two Summer Forest Ecology Outings at McConnells Mill State Park in Pennsylvania.
Designated a National Natural Landmark for its outstanding features, McConnells Mill is a treasure trove for learning. Central to the park’s landscape is the Slippery Rock Gorge — a deep ravine carved by powerful forces, exposing millions of years of ancient bedrock and currently supporting mature forest ecosystems.
Located in northwestern Pennsylvania, Cook Forest is home to one of the last remaining old-growth forests in the entire region, with 11 old-growth areas spanning over 2,300 acres. One of the areas within the park, the Forest Cathedral, contains arguably the finest concentration of old-growth trees in the northeastern United States.
During these outings, we will walk through deciduous and coniferous woodlands while discussing forest ecology. We’ll investigate big trees and big rocks. We’ll see historic landmarks, and we’ll discuss important geological influences that have drastically shaped the landscape.
In addition to learning key characteristics of mature and old-growth forests, participants will learn tree identification, mushroom ecology and identification, the role of fire as an ecological agent, ways to interpret forest history, and much more.
These outings are great opportunities to learn, explore, and connect with nature in spectacular settings. They’re also great opportunities to meet wonderful people.
Please note: Each outing is a single-day event. To maximize your learning experience, space is limited and registration with payment in advance is required to secure your spot.
I first heard this statement many years ago. Occasionally, I still hear some version of this claim: Black walnut engages in warfare by releasing a chemical into the soil. This chemical kills or inhibits the growth of plants.
But is this entirely true? Does black walnut actually kill plants?
Some people say yes. Other people say no.
In a brand-new video, I share several key findings from scientific studies and personal observations that shed some light on this controversial topic.
I’m excited to announce that I’ll be leading a Summer Forest Ecology Outing in a few weeks, and I’d love for you to join me!
This outing offers a unique in-person opportunity to learn the fascinating ecology and geology of a remarkable area: McConnells Mill State Park in Pennsylvania.
Designated a National Natural Landmark for its outstanding features, McConnells Mill State Park is a treasure trove for learning. Central to the park’s landscape is the Slippery Rock Gorge — a deep ravine carved by powerful forces, exposing millions of years of ancient bedrock and currently supporting mature forest ecosystems.
During this outing, we will walk through deciduous and coniferous woodlands while discussing forest ecology. We’ll investigate big trees and big rocks. We’ll see historic landmarks, and we’ll discuss important geological influences that have drastically shaped the landscape.
In addition to learning key characteristics of mature forests, participants will learn tree identification techniques, mushroom ecology and identification, the influence of glacial activity on landscape development, ways to interpret forest history, and much more.
This outing is the perfect opportunity to learn, explore, and connect with nature in a truly spectacular setting.
Interested? Here are the details:
When: Saturday, July 12 or Sunday, July 13, 2025 (Choose one date; both programs will cover the same material.) Where: McConnells Mill State Park, Pennsylvania Time: 10:00 am — 4:00 pm
To maximize your learning experience, space is limited and registration with payment in advance is required to secure your spot.
Every now and then, I’ll come across a decent-sized American chestnut and wonder: “Just how big did these trees get?”
I’ve always read that American chestnut was a dominant tree throughout eastern North American forests. I’ve heard people describe American chestnut as a tree that towered above all others. I’ve even seen references to American chestnut as “the redwood of the east.”
But how much of this is true? Was American chestnut an exceptionally massive tree?
Unfortunately, it’s difficult for us to know for sure. A fungal disease known as chestnut blight killed nearly every large American chestnut throughout the first half of the 1900s. Today, American chestnut still exists on the landscape, but almost always as a smaller tree.
Ecologists in recent years have been wondering about the size of American chestnut in pre-blight forests. I’ve been wondering about it too, which is why I decided to film a video on the topic. It turns out that we may have some answers after all.
Has the size of American chestnut been exaggerated in recent decades? What do sources from the 1800s tell us?
“Our relation to the natural world takes place in a place.”
The American poet Gary Snyder wrote those words. I don’t think he’s wrong.
Every time we harvest a wild mushroom, we do so in a place. Every time we add a new bird to our life list, we do so in a place. Every time we gather spring water and admire a wooded valley, we do so in a place.
Alvars, bogs, fens, forests, marshes, prairies, savannas, and swamps are all places where life abounds. When we refer to these places specifically as “ecosystems,” a few interesting things happen: We see important connections, we see intricate relationships, and we see where humans fit into the story.
If you want to strengthen your connection to nature by learning these fascinating ecosystems, consider enrolling in Exploring Wild Ecosystems. This is my newest online course designed to improve your ecological literacy.
First, I want to say thank you to everyone who registered for the upcoming Old-Growth Forest Ecology Outing on May 31 and June 1. Both programs are sold out. Stay tuned for more Learn Your Land events this year!
I also want to mention that Exploring Wild Ecosystems will be open for enrollment on Monday, May 12. Thisis my newest online course intentionally designed to improve your practical knowledge of ecology. If you’re looking to develop ecological literacy and become a better naturalist, consider enrolling on Monday, May 12.
And now on to the newest video…
If you’ve spent enough time in tick-prone areas, you’ve probably seen ticks sucking the blood of deer. Logically, it makes sense that deer would at least be carriers of the Lyme disease spirochete. After all, white-footed mice and other mammalian tick hosts can be reservoirs for the bacteria.
But white-tailed deer are different. Their blood isn’t like the blood of other animals.
Scientists have been studying the relationship between deer and Lyme disease for decades. The newest research is quite fascinating, and in a brand-new video, I address some of the misconceptions surrounding the role of deer in transmitting Lyme bacteria.
Do deer ever get Lyme disease? If they don’t, what is it about deer that makes them immune? If deer are immune, why do ecologists still advocate for a reduction in the deer herd as a way to reduce Lyme disease rates in humans?
I’m really excited to announce that I’ll be leading an Old-Growth Forest Ecology Outing in a few weeks, and I’d love for you to join me.
This outing offers a unique in-person opportunity to learn the rich ecology and distinctive features of older forests.
We’ll begin the day by walking through a mature upland hardwood forest and discussing forest ecology. In the afternoon, we will explore a magnificent old-growth conifer forest and discuss old-growth forest dynamics.
In addition to learning key characteristics of mature and old-growth forests, participants will learn tree identification techniques; mushroom ecology and identification; the influence of geology on forest development; ways to interpret forest history; the role of fire as an ecological agent; old-growth forest misconceptions; and much more.
This event will take place in Cook Forest State Park. Located in northwestern Pennsylvania, Cook Forest is home to one of the last remaining old-growth forests in the entire region, currently hosting 11 old-growth areas totaling over 2,300 acres. One of the areas within the park, the Forest Cathedral, contains arguably the finest concentration of old-growth trees in the northeastern United States. This remarkable area is home to dozens of old-growth eastern white pine and hemlock trees, many over 300 years old and towering above 140 feet in height.
This outing is the perfect opportunity to learn, explore, and connect with nature in a truly spectacular setting.
Interested? Here are the details:
When: Saturday May 31, 2025 or Sunday June 1, 2025 (Choose one date; both programs will cover the same material.) Where: Cook Forest State Park, Pennsylvania Time: 10:00 am — 4:00 pm
To maximize your learning experience, space is limited and registration with payment in advance is required to secure your spot.
Years ago, I didn’t know anything about morel mushrooms. I didn’t know what they looked like. I didn’t know how they tasted. I didn’t even know they existed.
Then one day I attended a mushroom program with a local club. Experts in the club introduced me to morels. “Here’s what morels look like,” they said. “You’ll find them all over this park.”
“Great,” I thought to myself. “I now know everything I need to know.”
Except I still hardly knew anything.
Sure, I quickly learned how to identify morels, and I heard a few things about looking in certain areas: “Look for elms, apples, and poplars. Morels really like sweet soil.”
But where would I find elms, apples, and poplars? What the heck is sweet soil?
It soon dawned on me that knowledge of mushrooms wasn’t enough. If I really wanted to improve my skills, I needed to learn tree identification. I needed to learn ecology. I needed to learn geology.
And so I learned as much as I could. Slowly but consistently, I developed a wider set of skills. Eventually, I became a better mushroom hunter.
Today, I interact with wild landscapes a bit differently than I did back then. I now look for connections. I look for relationships. I look at the bigger picture.
All this to say, if you want to find morels this year, I strongly encourage you to learn the connections that bind morels to their ecosystems. In a brand new video, I discuss how to approach morel mushroom hunting through a more holistic lens.
Speaking of learning, consider enrolling in Foraging Wild Mushrooms to improve your foraging skills.
I created this 4-season online course to help you become a successful mushroom hunter. Included in this course are instructional videos on mushroom ecology, mushroom biology, common edible mushrooms, medicinal mushrooms, poisonous mushrooms, cooking techniques, and medicine-making.
Paths I Walk 
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