Hello, from the Lehigh Valley!
This week I have the second article in my Roseto series as well as part 2 of the Secret Underground Network.
To read the first article I wrote about the beneficial properties of Dandelions and my memories of picking them for my Grandmother in Roseto you can click the button below:
I was walking in the woods up in Roseto and the cold clear mountain streams brought back memories from foraging for watercress with my Dad back behind the Green Walk’s Trout Hatchery in Bangor. So I thought this would be a great time to publish the second article of my “Roseto Series”.
Watercress is called the most nutrient-dense food by the CDC
Watercress, My Dad, and the Quiet Wisdom of Roseto
When I was a kid—probably not even eight yet—my dad would take me out into the woods behind the old Green Walks Trout Hatchery in Bangor. We weren’t fishing or hiking. We were hunting for something small, green, and wild: watercress.
We’d walk out along those winding little streams, where the water was always cold and clear, even when the air had that edge that hinted winter was on its way—maybe sometime near Thanksgiving or even closer to Christmas. I remember the ground being soft, the air crisp, and the sound of running water echoing through the trees. My dad carried a pair of scissors, and when we found it—those bright green clusters floating like tiny rafts in the stream—he’d bend down and start trimming.
It wasn’t for us, not really. It was for my Gram and her friends, the old Italian ladies back in Roseto. We’d bring the watercress home and deliver it like gold—little bundles wrapped in damp paper towels, full of surprise and smiles. I still remember their faces lighting up at the door, their hands reaching out with that mix of gratitude and familiarity. They’d say things like “Dio ti benedica” and “You made my day.”
Back then, I just liked the walk and the adventure. But now, I see it for what it really was—an act of love, tradition, and healing.
Watercress: A Powerful Gift from the Stream
I wasn’t a big fan of it as a child but for those who loved it, Watercress wasn’t just delicious; it was powerful medicine disguised as a humble green. The old ladies knew it instinctively, but today’s science confirms their wisdom. The CDC ranks watercress as the most nutrient-dense vegetable you can eat, loaded with vitamins A, C, and K, and minerals like calcium and potassium. That peppery flavor? It’s packed with glucosinolates—compounds shown to fight inflammation, protect against cancer, and promote cardiovascular health.
The vitamin K in watercress helps bones stay strong, and its nitrates help keep arteries flexible, promoting lower blood pressure and reducing heart disease risk. It’s also abundant in antioxidants that combat aging and inflammation, two major drivers behind chronic disease. Those little bundles my dad harvested might have been quietly keeping Gram and her friends healthy for years.
Tradition, Community, and Longevity
Watercress symbolizes something deeper than nutrients—it embodies Roseto’s quiet wisdom. Scientists once studied our town, puzzled by its low rates of heart disease despite dietary habits that didn’t fit conventional wisdom. They coined it the Roseto Effect, crediting our tight-knit community bonds. They weren’t wrong. But what they overlooked might have been right there on the plate—those fresh greens, gathered by families for generations.
Our ancestors ate seasonally, foraged for their food, and maintained strong bonds through acts of generosity like my father’s deliveries. These traditions were the real secret sauce of longevity—a blend of nutritious food and heartfelt community.
This article is the second in my series revisiting the foods my Gram loved and the hidden connections between diet, culture, and health in Roseto. Next, we’ll explore another treasured plant from her kitchen: rhubarb.
While my Gram focused on what went into the kitchen, my work today focuses on what happens under the soil that makes those plants possible.
5 Ways You’re Accidentally Killing Your Soil’s Fungal Network
Part 2 of The Underground Network series
The mycorrhizal network in a single cubic inch of healthy soil. Most suburban lawns haven’t had this in twenty years.
Last week we covered the underground network that connects nearly every plant in your yard — the mycorrhizal fungi doing the quiet work of moving water, nutrients, and chemical signals between roots you can’t see.
The response was bigger than I expected. Over 300 of you opened that email, and a dozen wrote back asking some version of the same question:
Am I killing mine?
Honest answer: probably. Not because you’re careless. Because the entire conventional landscaping industry — the fertilizer schedules, the “weed and feed” bags at the big box store, the spring cleanup checklist your neighbor swears by — is built on practices that sterilize soil.
Here are the five most common ways it happens. If you’re doing even two of these, your network is in rough shape.
1. Phosphorus Over-Application (the silent killer)
Anything above 50 ppm shuts down the fungal partnership. This sample tested at 287. It’s not unusual around here.
This is the one almost nobody talks about, and it’s the one that does the most damage.
Here’s the science: when soil phosphorus gets high, plants stop investing in fungal partnerships. They don’t need to. The P is already there for the taking, so the underground economy shuts down. Research consistently shows that once soil P climbs above roughly 50 ppm (Bray-1 test), mycorrhizal colonization drops sharply. Keep piling it on and the relationship collapses entirely.
Where it sneaks in:
“Starter fertilizer” with a high middle number (the P in N-P-K)
Bone meal dumped in the hole at planting — gardening magazines have been recommending this for decades and it’s mostly counterproductive
Generic 10-10-10 applied on autopilot every spring
Most suburban Lehigh Valley lawns I test are already loaded with P from 20+ years of this stuff
The fix:
Soil test before you fertilize anything. Penn State Extension does it for around $10, and the results come back with specific recommendations for our region. If your P is already high — and it probably is — stop adding it. Don’t wean down. Just stop.
2. Tilling and Soil Disturbance
A rototiller is a blender. One pass through a garden bed can reduce mycorrhizal colonization by 30-50%.
The fungal network is made of actual physical filaments called hyphae. Miles of them per cubic foot of healthy soil, woven through the root zone like a living textile.
A rototiller is a blender. One pass through a garden bed can reduce mycorrhizal colonization by 30-50%. Two passes and you’ve essentially started over.
This is why “double-digging” and annual bed prep are some of the worst things you can do to a garden that’s finally hitting its stride. You’re destroying the infrastructure your plants spent years building.
The fix:
No-till beds once established
Broadfork instead of a tiller when you need to loosen compaction
Sheet mulching (cardboard + compost + wood chips) for new bed installs — builds soil instead of pulverizing it
3. Fungicide Use
This one is obvious in the name and invisible in practice.
The brown patch is the symptom. The sprinkler is the cause. The bottle is the wrong answer to the wrong question.
Lawn fungicides applied for “brown patch” or “dollar spot” don’t discriminate between pathogens and partners. They kill the helpful fungi along with the ones you’re targeting. Systemic fungicides on ornamentals are worse — the compound moves through the plant and into the root zone, where it hits the mycorrhizal community directly.
Here’s what bothers me about this: most lawn “fungal problems” in the Lehigh Valley aren’t fungal problems at all. They’re watering problems. Or compaction problems. Or a thatch layer that’s smothering the crown of the grass. The fungus is a symptom, not the disease.
The fix:
Diagnose before you treat. If you’ve got a recurring patch issue, look at what’s happening above the soil first — irrigation schedule, mowing height, foot traffic, drainage. The fungicide route treats the symptom and degrades the underlying system every time.
4. Bare Soil Exposure
Leaf litter holds moisture and feeds the fungi.
On a sunny July afternoon in Bethlehem, bare soil surface temperatures hit 140°F. Fungal hyphae in the top inch die above 95°F.
This is why the “clean mulch ring” around every suburban tree is, biologically speaking, a disaster. The aesthetic looks tidy. The tree is slowly losing its network.
Same issue with freshly installed beds that sit open between plantings, or lawns scalped short in summer heat.
The fix:
Living mulch — low ground-covers that shade the soil
Leave the leaf litter in beds. This goes against every instinct the lawn care industry has trained into us. And it can be extremely ugly. However, if you go about it the right way it’s 100 percent possible to keep the same aesthetic as a property being maintained by a professional full-service provider that bags and removes all the leaves throughout Fall. (I’ve developed a whole system for doing this for customers which I’ll get into soon.)
Wood chip mulch over a layer of compost, kept away from trunks (no volcano mulching — more on that in Part 3)
5. Synthetic Nitrogen Dependency
Same mechanism as the phosphorus problem, different nutrient.
High soluble nitrogen tells a plant the same thing high P does: you don’t need partners anymore. The plant weans off the mycorrhizal relationship and becomes dependent on the fertilizer showing up on schedule.
This is why chemically-managed lawns need more fertilizer every year, not less.
The network that used to deliver nitrogen for free is gone. Now you’re paying TruGreen for what your soil used to do for nothing.
The fix:
Compost top-dressing in spring and fall
Leaf mulch mowed into the lawn instead of bagged and sent to the curb
Slow-release organic nitrogen sources when you do need to supplement (feather meal, alfalfa meal, composted poultry manure)
Organic nitrogen feeds the soil biology, which feeds the plant. Synthetic N skips the middleman and gradually eliminates him from the process.
The Pattern
Look at those five again. Every one of them is standard practice in conventional lawn care. None of them are necessary. All of them are profitable — for the company selling you fertilizer every six weeks, or the fungicide application, or the spring tilling service.
This is why the Living Property System starts with soil. You can’t design your way around dead dirt. You can install the most beautiful native plant palette in the Lehigh Valley and watch it struggle for a decade if the underground economy has been bankrupt since 1998.
The good news: soil biology rebuilds faster than most people think. Stop doing the five things above and you’ll see measurable improvement in a single growing season. Actively feed the system (Part 4 of this series) and you’ll see it in weeks.
Coming Up
Part 3 — Mother Trees in Your Yard:
How to identify the hub trees already doing this work on your property, and how to plant around them so you don’t undo decades of underground network-building. There’s an 160-year-old white oak I worked around last year that changed how I think about residential design. I’ll tell you about it.
Part 4 — Mycorrhizal Inoculation:
The practical guide. What products actually work, which ones are snake oil, and the DIY method nobody in the industry wants to talk about.
I have 3-4 more articles written and will be trying to stay consistent with weekly newsletters from here on out. Thank you very much for reading!
Now — this is a preview of the lawn care content I mentioned earlier:
The Lawn Care Industry’s Dirty Secret: Your ‘Custom Program’ Was Decided Last October
That soil test they did in your driveway? Let me tell you what it actually tells them — and what it doesn’t.
Every January, the phones light up at the big lawn care companies. TruGreen. Joshua Tree. The regional franchises with the familiar trucks. They’re calling existing customers with a deal: prepay your annual program now and save 5%. Act fast. Limited availability.
It sounds like a customer loyalty perk. It’s actually inventory management.
Here’s how the business actually works.
The Lawn Care Pre-Buy Cycle Nobody Talks About
Large chemical lawn care companies purchase the majority of their product inventory in the fourth quarter of the prior year. They negotiate volume discounts with chemical suppliers based on how much they commit to buying. The more they pre-buy, the better their cost structure.
Then they spend January and February selling annual programs to justify that purchase.
By the time their truck shows up at your door in April, the chemistry is already sitting in a warehouse. The visit schedule is already built. The products are already paid for. What happens between now and then — the winter your lawn had, the bare spots that opened up, the soil conditions specific to your property — is largely irrelevant to what they’re going to apply.
You’re not getting a program designed for your lawn. You’re getting a distribution schedule for pre-purchased inventory.
The “Custom Soil Test” That Isn’t
Here’s the part that really bothers me after 18 years in this industry.
These companies market their programs as custom and science-based. They send a salesperson — not an agronomist, not a soil scientist, not a landscaper with field experience — to walk your property for 8-10 minutes with a tablet. They measure your square footage. They ask a few questions. And then they print out a “custom program” right there in your driveway.
I want you to think about that for a moment.
I will be finishing and publishing the rest of this article soon. Thanks again for reading!
- Mike Ruggiero
