The morning of that day in the winter of 2011 began like any other. Known as cutblock number 7190 by his employer, Teal Jones, the twelve hectares fringing the east bank of the Gordon River a half-hour’s drive north of Port Renfrew was a prime example of kind of old-growth forest that once spanned Vancouver Island from tip to tip and coast to coast. This small patch of trees held black bears and Roosevelt elk, with the possibility of wolves and cougars passing through. It held red-capped woodpeckers knocking on standing deadwood, squirrels and chipmunks nibbling on cones to extract the seeds, and fungi the size of a dinner plate protruding from the trunks of some of the largest trees in the world. New green seedlings sprouted from old fallen stumps. Cronin brushed through the undergrowth, his jeans damp with persistent dew. Mounds of lime-green moss covering a thick bed of decaying tree needles were moist and soft underfoot—absorbing sound like a sponge. For now, the forest was still.

Cutblock 7190 also held great value for his timber company. At roughly twice the size of twelve soccer fields, the flat plateau near the base of Edinburg Mountain in the scope of the valley was a tiny sliver of forest. But it held some towering and valuable trees. The price of timber fluctuates every year, depending on species and market, but that year old growth was fetching between $80 and $100 per cubic metre of wood. (One cubic metre is roughly the size of a telephone pole.) West Coast old-growth forests produce between 800 to 1,200 cubic metres of wood per hectare, roughly twice as much timber as second growth. The gross value of the cut wood in this one cutblock in the Gordon River Valley could yield approximately a million dollars.

Working in tandem with Walter Van Hell, Cronin began the survey at the low side of cutblock 7190, where he could hear the Gordon River thundering on the other side of a steep gorge. Come spring, salmon fry would be wriggling free of the pebbled river bottom and make their first swim downstream to open water; come fall, grown fish would hurl themselves upstream to spawn in the clear waters. He walked the contour of the cutblock. At regular intervals of a couple dozen metres or so, he reached into his vest pocket for a roll of neon-orange plastic ribbon and tore off a strip. The colour had to be bright to catch the eye of the fallers who would follow in the months to come. He tied the inch-wide sashes around small trees or low-hanging branches to mark the edges of the cutblock. “Falling Boundary” was repeated in block letters along each ribbon. The forest practice code stipulated that the company had to leave a buffer of intact forest 50 metres up from a river, especially one that was known to be a spawning ground for salmon. Some engineers keep tight to those regulations to try to extract as much timber as possible from a given area. They fall under the category of what’s known as a “timber pig,” someone who cuts and hauls trees by a singular mantra: log it, burn it, pave it. The sentiment is two-fold: ecology comes secondary to economics and these forests exist to be harvested. But Cronin was often generous with these buffer zones, leaving 60 or 75 metres up from a river—as much as he could without drawing the ire of coworkers or bosses.

Once the twelve hectares was enclosed in orange ribbon, Cronin crisscrossed through the cutblock surveying the pitches and gradients of the land. It was a slow task, clambering over fallen nurse logs and through thickets of bush. His goal was to determine where a road could be ploughed through the forest. It takes a specific skill to see through dense trees and haphazard undergrowth and plot a sure course that could allow for the safest and easiest extraction of logs. Maneuvering over undulating land layered with deadfall and vegetation, he marked a direct line through the forest with strips off another roll of ribbon, this one hot pink and marked with the words “Road Location.” He traversed any creek he came across and flagged it in red ribbon. When he was done, the green-and-brown grove was lit up with flashes of colour.

While working, Cronin was followed by a Steller’s jay—the provincial bird of British Columbia—which took particular interest in his work. “He would follow me around like a dog,” Cronin said. “I would be traversing creeks, taking my measurements and bearings, and he’s hopping behind me picking up the bugs as I stirred them up.” But once Cronin traversed a creek that separated cutblock 7190 with another patch of old growth slated for clearcut to the southeast, the jay stopped. “He would never cross that creek. We would pick him up again when we crossed back,” he says.

The sun broke through the canopy in long beams that spot-lit sword ferns and huckleberry bushes growing from the forest floor. But as Cronin waded through the thigh-high undergrowth, something caught his eye: a Douglas fir, larger than the rest, with a trunk so wide that it could have hidden his truck behind. He scrambled up the mound of sloughed bark and dead needles that had accumulated over centuries around the base of the giant tree.

Dennis Cronin looked up.

The tree dominated the forest; a monarch of its species. A crown of dark-green, glossy needles flitted in the breeze well above the canopy of the rest of the forest, made up of a handful of exceptionally large cedars and firs but mostly younger and thinner hemlock. The tree’s trunk was limbless until a great height, like many of the oldest Douglas firs he had come across in his career. The species often loses its lower branches that grow in the shadow of the forest’s canopy, directing its attention to those that enjoy the maximum of the sun’s energy. Many of these large and old Douglas firs have trunks that grow twisted and gnarled, with clear marks of disease. This tree’s trunk sported few knots and a grain that appeared straight: it was a wonderful specimen of timber, Cronin thought.

He had spent the majority of his life walking through old-growth forests, under the canopies of some of the largest trees in the country. He had seen hundreds of giants, but this one tree stood above the rest. Douglas firs and Western red cedar are the two species in this area that are the most wind resistant, so are often stable enough to outlast storms and continue to grow through several iterations of a forest over a millennium. Still, many of the larger, centuries-old examples of these two species break off at their more fragile tops and their centres, over time, fill with water and rot. They become unstable and prone to blowdown. The timber inside begins to lose its value. The majority of the trees Cronin had flagged over his career, marking them for protection, were ones that he considered to be non-merchantable wood: the trunks were too twisted or too flawed. He could tell by looking at knots along a trunk if there was rot inside. For these trees, Cronin thought, why cut them down? Instead of a timber company deriving little value from these diseased or hollow trees, they can be left standing to serve the remainder of their lives as wildlife habitats.

But when Dennis Cronin laid eyes on the large Douglas fir in cutblock 7190, he could see immense timber value. “I’m a logger and I’ve taken out millions of trees,” Cronin said. “But I was impressed.” The limbless trunk held only a minor twist, and the bark looked healthy. He couldn’t know with one hundred percent certainty, however. “You don’t know until you put a saw into it and by that point it’s too late,” Cronin said. But the tree exhibited few of the exterior telltale signs of rot or disease.

As well as an encyclopedic knowledge of these forests, Cronin could also see through the bark of a tree to its very core and see dollars. “I can look at a tree and tell if it’s got value or not. If it’s not twisted, if the bark is healthy, if the limbs are healthy,” Cronin said. “That one had value.” Encased within the deeply crevassed and corky bark of this single tree lay enough wood to fill four logging trucks to capacity with some to spare. If milled into dimensional lumber—two-by-fours, two-by-sixes, and the like—it could be used to frame five 2,000-square-foot houses. At first glance, he assessed the single tree in unprocessed log value as around twenty thousand dollars. But since it was a Douglas fir, with its coveted warm colour and pronounced grain, the tree could be turned into higher-priced beams and posts for houses in Victoria and Vancouver, or shipped across the Pacific Ocean to Japan. The single tree that the logger stood under could fetch more than fifty thousand dollars.

Using his hand-held hypsometre, a device to measure a standing tree’s height using triangulation of measurements, Cronin took readings from the base and the top of the tree and estimated its height at approximately seventy metres—one of the largest he had ever come across in his career—around the height of a twenty-story apartment building. Using a tape, he measured the tree’s breast height girth. It appeared just shy of the Red Creek Fir, the largest Douglas fir in the world, located a couple valleys away. Cronin didn’t know it then, but he had found one of the largest trees in the country. “When I walked up to it, I passed some big firs and some really big cedars—twelve footers, maybe,” Cronin said, referring to the diameter of the trees. But this one fir dominated the rest. “He towered above the forest. He stuck out like a sore thumb.”

Cronin could have moved on, continuing through the undergrowth to finish the job of mapping and flagging the cutblock for the fallers. The tree, with the rest of the forest around it, would have stood patiently awaiting its inevitable fate. The fallers would have arrived months later and the tree would have been brought down in a thunderclap heard kilometres away, hauled from the valley, loaded onto logging trucks, and taken to a mill to be broken into its most useful and most valuable parts.

But Dennis Cronin lingered under the big tree. He walked around a circumference so great it would take more than six people holding hands in a circle to wrap around its base. Cronin had spent four decades working on logging crews and as a forest engineer, countless days working in the forests of Vancouver Island, and had encountered thousands of enormous trees over his career.

Instead of moving on, Cronin reached into his vest pocket for a ribbon he rarely used, tore off a strip, and wrapped it around the broad base of the great Douglas fir’s trunk. The tape wasn’t pink or orange or red but green, and along its length were the words “Leave Tree.”