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Gabrielle Marsden

@zswallowtailpgh.bsky.social
136 followers 177 following 144 posts

I’m working on restoring the zebra swallowtail back to Pittsburgh and beyond. That means lots of pawpaw, Asimina triloba for Eurytides marcellus, hike, canoe, industrial history

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Gabrielle Marsden @zswallowtailpgh.bsky.social · 30/07/2026
Cooper's hawks, not eating my chickens
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Reposted by Gabrielle Marsden
Ferris Jabr @ferrisjabr.bsky.social · 20/07/2026
This was one of the most polarizing subjects I’ve ever covered, with reader reactions all over the map. Notably, the Bluesky community was by far the most reasonable and nuanced — you guys are awesome! In case you’re interested, my post on IG regarding the diversity of reactions and key points:
Screenshots from Instagram. Text reads:
“My @nytmag feature on the native plant movement is now in print (July 19 issue). Thank you so much to everyone who read and shared the story. It generated a big response: more than 26K likes on IG, more than 700 comments on the NYT website, a lot of reader emails — a truly spirited discussion. Plants provoke our passions. 

It also proved to be one of the most polarizing subjects I’ve ever covered. Reactions were all over the map. Several big name writers I really respect told me how much they enjoyed and agreed with my essay, which meant a lot. Many readers commented that they appreciated the research, thoughtfulness, and balanced analysis, which helped them navigate this complex subject. But there were also far more extreme reactions, ranging from irate native plant enthusiasts who somehow got the utterly wrong idea that I’m completely against natives, with some even accusing me of being a shill for the horticultural industry, to anti-nativists who claim I was not nearly critical enough of a movement they equate with xenophobia and Puritanism. 

For the record, I’d like to take a moment to restate and reemphasize a few key points:

-I support gardening with native plants. I honestly don’t understand how anyone could read my article in good faith and conclude otherwise. My essay explicitly advocates for prioritizing native species in our gardens to support wildlife and our local ecosystems and concludes with me doing exactly that….
-Just because native gardening alone cannot solve the extinction crisis does not mean it’s pointless — far from it. That passage was about maintaining perspective. I was writing in direct response to Tallamy’s hyperbolic claims that individual gardeners and homeowners alone can solve the extinction crisis and determine the future of nature in our country. I would love it if that were possible, but unfortunately it’s not. It’s vital to remember just how much more reform is needed to preserve biodiversity and functioning ecosystems across the continent. Nonetheless, as I wrote, gardening with natives has numerous genuine ecological benefits and banding together to create a Homegrown National Park is a thrilling and achievable goal that I fully support. 

-There are valid ecological reasons to strategically incorporate a few non-invasive introduced species with proven benefits into majority native gardens. Some nativists claim that “there is never any excuse to plant a non-native.” That is an extreme stance that is not supported by science, is highly unrealistic for the majority of gardeners, and a poor strategy for our rapidly changing world. Some introduced species can expand habitat and resources for wildlife and help our gardens, parks, and other cultivated spaces adapt to climate change. I honestly do not think that intelligently integrating a few introduced species into primary native plantings should be controversial at all. We need open-minded, diverse, and flexible strategies to grow a better world together. Gardening with natives, and for wildlife more generally, has benefits far beyond the ecological — it shifts people’s attitudes, renews a sense of agency, and inspires change. This is a point that many commenters raised with which I completely agree. I wish I’d had more room to write even more about the emotional and cultural aspects of gardening. I have personally witnessed neighbors change how they manage their land after seeing our garden here in Portland. 

-Extremism within the gardening community is real. Many native enthusiasts get upset at the suggestion that there are purists among them, but if you want proof, just take a look at the comments here and on the NYT website, not to mention the legions of stories of gardeners who have been shamed by extremists. I can personally attest. After the article published, I experienced the unfounded wrath and abuse of such gardeners to a degree that shocked me. To be clear, I think such attitudes constitute a minority, albeit a vocal and problematic one. As I wrote, most people who support gardening with natives, especially professionals, are reasonable and nuanced, advocating for strategically combining natives and non-natives. 

-To sum up: If you want your garden to support wildlife and your local ecosystems, then you should absolutely prioritize native plants, a conclusion supported by decades of research, careful observations, and basic ecological principles. But you don’t have to tear out or vilify absolutely everything that isn’t native. There are also legitimate ecological roles for a few beneficial introduced species. And you can have some plants just for you, too: veggies, medicines, gorgeous flowers, plants that hold memories, spark joy, or are otherwise meaningful to you. It doesn’t have to be one or the other, black or white, native or non-native. The world is big and complex and diverse enough for both.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 28/07/2026
substack.com/@gabriellema...
substack.com
Gabrielle Marsden (@gabriellemarsden)
These maps I searched for because I am obsessed. It begins with the zebra swallowtail, as always. I look at this map pouring over the details recalling places that I have visited largely by canoe, won...
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Reposted by Gabrielle Marsden
Pittsburgh's Public Source @publicsource.org · 10/10/2025
For 21 years, a Natrona Heights orchard has produced North America’s largest native fruit — the pawpaw. Now locals hope it plays a role in bringing back a long-displaced butterfly. www.publicsource.org/pawpaw-nativ...
publicsource.org
Pittsburgh’s pawpaw revival takes root —and could bring a rare butterfly back to town
From Natrona Heights orchards to a Wilkinsburg pawpaw party, a native fruit is gaining favor as a tasty snack for residents, human and insect.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 06/09/2025
Spicy spicebush swallowtail in Donora
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 28/08/2025
A lovely surprise #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 10/08/2025
I’ve been thinking about relationships. The world is built on relationships and the relationships I mean are those of the natural world. I had this thought yesterday which I will describe in the photo descriptions.
I am canoeing on the Monongahela with someone from 3RiversWaterkeepers who started having free kayak outings to help people get their feet wet, quite literally, in the hopes that more people will think of recreation on our rivers. I have my own canoe with my co-pilot Todd. It is a bit monotonous actually hearing about all of the various current insults to our rivers plus most of the people who sign up are quite tardy, then we go over safety info for boating, including inspecting my PDF to assure that we are safe as well as everyone else. However, the majority of participants are very much novices. A number aren’t aware that when you go kayaking your feet will get wet. 

Eventually, we are on the river. I tend to feel like I’m a little obnoxious with imparting my knowledge of various things. Many of the people who work for the nonprofits know me and I’m a bit of an interloper. I’m not sure whether or not they appreciate that. One of the kayak people asks about the flora that existed and I share a bit of my knowledge on that front. I am learning that less is more and it helps that my knowledge is not comprehensive but it’s still easy to overwhelm people.

It does surprise me when some folks that work for these folks have large gaps in their knowledge on these matters which is true of one of the kayak employees. Anyway, it is fortunate that one river plant, eelgrass (Vallisneria americana) is in bloom so I had something to show anyone who showed interest is a good number of people there. In writing this, I look up more details of this plant. Eelgrass has male and female flowers that cross pollinate via water. The female flowers are the ones that are visible as the males stay under water.We meander upstream, not very far as there is a time limit, and between the tardiness and the lectures, not much time was left to paddle, at least not to my liking. I chat with, an employee of 3Rivers about her botanical knowledge though she knows a bit, she opines that fungi are more important to learn about than plants. I gently disagree as I see that all are important. I don’t say it there and then, but I later reflect on the river that it’s the relationships between the plants, fungi, and the land and water that they exist on that are more important to me and how human activity impacts them.I worry a lot about my relationships with the various nonprofits that have more power to impact our neglected environments than I do as a single person. I actually signed up for this outing because I would like to organize outings similar to it. I want to take groups of people out on our rivers, especially rivers like the Monongahela that tend to scare people due to the massive insults that it has endured and still endures today. I honestly don’t care to do the heavy lifting in organizing an outing like this because at heart, I’m a bit lazy. I tried to organize an outing like this past year but failed, though I can use poor weather conditions partially as an excuse. The facts are that any individual does have the power to have a positive impact on their environment, but it is limited. A lot of compromise is needed if one wants to get more done. It’s about building relationships that last which is what our natural world is built upon.

I will eventually organize a boat outing. I am getting closer to finding a viable collaborator, but I’m not there yet. In the meantime I am watching. My cross pollination might be akin to flowing water, but I’m not really sure, and it is evolving.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 06/08/2025
River rings on the lower lower Youghiogheny
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 05/08/2025
Hawk being pestered by a mockingbird
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 02/08/2025
#PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 28/07/2025
A few things that make me happy
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 18/07/2025
Grafted pawpaws in sterile patches. In theory, these will bear fruit in a few years which will help them grow and spread. There’s a mix of cultivars and wild stock from the vicinity #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 08/06/2025
Some wonders that I saw yesterday
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 18/05/2025
Mahatma Pawpaw! And more!
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 14/05/2025
Hey butterflies! Come see me talk about butterflies! #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #ukelele #banjolele maps.app.goo.gl/MuGbWCUYMxet...
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 02/05/2025
Battus philenlor on Arisolochia serpentaria, Greene County, PA
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 25/04/2025
Battus philenor, pipevine swallowtail climbs up, then flies. I’m not sure if this is a pattern but several showed this specific behavior while other species seem to just take off where they are. When I release insects I try to move them to a more natural setting before they are eager to go.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 24/04/2025
I love the flowers I love the millipedes
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 21/04/2025
Battus philenor, hand reared last year from eggs collected in my yard. Their host plant is various species of pipevine, thus their common name pipevine swallowtail. They aren’t common in the Pittsburgh area but they aren’t rare either.
I am finding that wings are not 2 dimensional. Here we see rounded spoilers just above the tails. Zebra swallowtails have them too.I love the shimmering dark blue that’s not only on the wings, but also the body I had 2 today The shimmery back
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 17/04/2025
#ZebraSwallowtailTrails #pawpawpathways #pittsburghpawpawpathways #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 16/04/2025
Here’s a song that I sing daily that is like a prayer #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #ukelele www.tiktok.com/t/ZP8jmJ3tM/
tiktok.com
I’m, not dead, I should be in Pittsburgh #Frankblack #reidpaley #Pixies #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #ukelele
TikTok video by Gobbism
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 13/04/2025
here we go! #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 13/04/2025
Some of the wonders that I saw at Enlow Fork
My iPhone takes decent night photosBlue eyed Mary, Collinsia verna. I forgot the name and called them blue blooded Mary. I kinda like my name!Pawpaw blossoms getting ready to bloom. This is on Wheeling Creek and Wheeling West Virginia is the only place in Westsyvania where I have seen the zebra swallowtail in the wild. It is highly likely that it still flies in Enlow ForkDevil’s Urn, Urnula craterium with some insects, springtails and something else
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 08/04/2025
It’s happening! This is a very, very rare butterfly in Pittsburgh thank you @laughingmantis.bsky.social #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
This butterfly is a result of a stray that came from somewhere close to Greensburg that landed in Greenfield.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 06/04/2025
My protest sign
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 30/03/2025
Blurry blue butterfly Celestine Landon?
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 29/03/2025
A big thank you to all who came to my fireside last night. There was no fire due to rain but I told the story inside #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #ukelele
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 28/03/2025
Drone recording during the golden hour
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 26/03/2025
Hey Butterflies! Come sit by a fire, have some beer and hear the story of the zebra swallowtail & its history in Pgh and beyond 1130 S Braddock Ave, Pittsburgh, PA 15218 #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #ukelele
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 25/03/2025
Decompressing butterflies. This drawer holds butterflies collected about a hundred years ago. The tiling dampened them a little.
Not ideal conditions
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 23/03/2025
Ai isn’t all bad. I was at a function where I googled some people that I met and decided to google myself. Here’s an AI result. #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 19/03/2025
Went on a walk with the Botanical Society of Western PA at Meeks Run. Saw some cool stuff
Dragonfly nymphSpring beauty’s have sprung!BubblesA little waterfall
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 13/03/2025
I wrote an article that is a valentine to NYC because I am writing a book about my work in Pittsburgh. Any ideas of publishers in the NYC area? #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration #NYCzebraswallowtail
I love this view of the zebra swallowtail because it shows its spoilers. Butterfly wings are not 2 dimensional!
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 13/03/2025
Yesterday I encountered these creatures in Greene County, PA
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 12/03/2025
Skunk cabbage pollination. King/Potter Nature Reserve
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 11/03/2025
Here’s a few bees since i am starting to see them outside. Spring is near
I’m terrible at identifying bee species. And I am failing at the flower species. I think though that both might be native.A forest flower and beeMexican sunflower is one of my favorite annuals for bees and butterflies Sneezeweed!
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 07/03/2025
Just some zebra swallowtails i posted to TikTok a while ago #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 05/03/2025
Sunflower for Ukraine. PS: there’s nothing wrong with seed oil
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 04/03/2025
I’m feeling a bit down today so I decided to post kittens. A few years ago we took in some from my street and it was an absolutely delightful experience. I only wish that I could have saved them all. A few remained feral and lived much shorter lives. I didn’t understand feral cats like I do now.
Pierogie, Tortellini, Simone, and To my
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 28/02/2025
I have tended to search my photos at random for something interesting. Today’s word is BLACK
This happens to be by Blacklick Creek. I forget what they used to make hereAnother scene from the Hoodlebug TrailThis is from a pizza place.Caliente I believeI’m wracking my brain trying to remember where this is. My guess is somewhere up north.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 26/02/2025
Pipevine swallowtail caterpillars. I love them. So much poop!
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 25/02/2025
A young sycamore stipule. A stipule stays on young sycamore twigs. Sycamores are pioneer trees that I see growing in places where other trees will not take root. We need pioneer trees before understory trees like pawpaws can grow.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 21/02/2025
Do you like fire, beer and butterflies? Well I’ve got just the thing for you! #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration 3riversoutdoor.com/blogs/events...
3riversoutdoor.com
COMMUNITY HAPPY HOUR - Paw Paws and Zebratails
Few people are as passionate as Gabrielle Marsden when it comes to the Zebra Swallowtail Butterfly. Once common in Pittsburgh, loss of habitat and pollution are the primary reasons for its disappearan...
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 20/02/2025
I’ve slowly been building a list of Bsky accounts that post 3 or more actual photos of butterflies and moths. It’s one way to distract from the kleptocracy. bsky.app/profile/did:...
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 19/02/2025
Barge drums. These are pretty amazing but I don’t know enough to explain them well.
This brutalist barge dock is close to a dismantled lock and dam. When the industries were at their peak. These were used frequently. I don’t know much about how this worked but I have seen them used around Elizabeth. This is close to Friendship HillA view from the Great Allegheny Passage in the Southside. This isn’t a drum like the others but it still has ship rope attached to it. There was a day that I was on the Ohio that I got tired and held onto one of these sort of ropes to rest. I think that this smaller construction is on the Monongahela, maybe still within Pittsburgh.I’ve not sure where this one is. It might be the Allegheny.
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Reposted by Gabrielle Marsden
Rich Lord @richelord.bsky.social · 18/02/2025
Pittsburgh is a research hotbed, and uncertainty about federal funding for science is rattling local labs and teams. If your Pittsburgh-based research is threatened or on hold, @publicsource.org wants to interview you. DM me for contact options.
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 18/02/2025
I few years ago I built a shed to house canoes and pawpaw seedlings. #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
Nipper helped supervise the construction. I specifically designed it to start pawpaw seedlings and to house canoes, both of which are necessary for the restoration of the zebra swallowtail. 

I used hooped cattle panels and reflectix insulation. To keep the critters out it is encased in hard cloth. This also helps with the structure.My first canoe is a duosport 13 of carbon Kevlar construction. This has been indispensable for my work. It has seen all of the local rivers here. Slipstream Watercraft is the company that built this canoe for me.Pawpaw seedlings from a dozen or so unique wild locations in the Pittsburgh area. They get partial sun which is what pawpaws need when they start. In addition they are raised on benches a foot above the ground to prevent Asian jumping worm infestations. As I plant these out in the wild I do not want to spread them.The roof is from an old billboard. It’s the most cost effective durable way to go and I’m recycling! GO STEELERS! Hey, I am in Pittsburgh so i must be a Steelers fan!
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 16/02/2025
A few highlights from yesterday. I wanted to see how the pawpaws that Oakmont got from me were doing. It’s been 11 months since they were planted. #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
Tacquería El Mariachi is very good! Pittsburgh is finally getting better Mexican food!There are a bunch of clean brick piles there. I need to look into the historyHere’s one of my trees! It’s still just a whip but soon it will soar!Plum Creek
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Reposted by Gabrielle Marsden
𝑀𝒶𝓎𝓇𝒶°❀⋆.ೃ࿔*:・🫧 @lepapillonblue.bsky.social · 15/02/2025
Donald Trump is the most disgraceful and incompetent president in American history. Article by: Ryan Grenoble
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Gabrielle Marsden @zswallowtailpgh.bsky.social · 15/02/2025
The Monongahela a bit upstream of Pittsburgh. This is absolutely amazing! If you have a boat that you paddle, come here! #PittsburghPawpawPathways #ZebraSwallowtailTrails #zebraswallowtail #pawpaw #asimina #pittsburgh #activerestoration
Monongahela River where the zebra swallowtail definitely flies. The river is lovely hereI have seen 4 beavers on the Monongahela, 1 in Pittsburgh proper, one by Homestead and 4 very close to where I found this piece of handiwork
A railroad bridge next to Friendship HillA long dismantled lock.
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