A Life Among Giants: Joseph Trimble Rothrock and His Beloved Trees
This botanical history post was featured on The Daily Gardener podcast:
April 9, 1839
On this day, Joseph Trimble Rothrock made his entrance into the world—a man destined to transform from a sickly child into the formidable "Father of Forestry." The irony, dear readers, is not lost on this chronicler that a boy of such delicate constitution would grow to champion the mightiest of nature's creations.
As a youth plagued by persistent illness, young Rothrock found himself inexorably drawn to the healing embrace of the wilderness, confessing rather poetically:
"I just had to go to the woods. Throughout my entire life, I have sought the 'out of doors' as a refuge against impending physical ills."
One must wonder if the trees whispered their secrets to him even then, knowing they had found their most ardent defender.
Rothrock's intellectual journey led him to Harvard, where he toiled daily in the private herbarium of the illustrious Asa Gray. The distinguished botanist had previously graced Rothrock's hometown with his presence, collecting specimens like a child gathering seashells. Of his mentor, Rothrock later remarked with touching sentimentality:
"[He] was kindness personified, though a strict disciplinarian and a most merciless critic of a student's work. I owe more to him than to any other man, and I never think of him without veneration."
Our hero also studied under the formidable Louis Agassiz, who became not merely his professor but a friend. Agassiz's motto—"study nature, not books"—seems to have imprinted itself upon Rothrock's very soul. How delightfully contrary for an academic!
When war called, Rothrock answered without hesitation, suspending his studies to fight in that most uncivil of Civil Wars. At Fredricksburg in 1862, both his right thigh and hand were wounded during Burnside's ill-fated assault. Imagine, dear readers, the scene of this future forestry icon shaking hands with President Lincoln himself in an army hospital—a meeting of two men who understood the value of preservation.
Later photographs reveal our bearded hero standing before a majestic white pine, his walking stick grasped in a right hand missing its little finger—a small sacrifice at Fredricksburg for a man who would give so much more to the forests he loved.
In a display of loyalty that would make even this chronicler's cynical heart flutter, Rothrock discovered upon attempting to return to Harvard that his professors—including the venerable Asa Gray—had formed a military company. Declaring Dr. Gray too old for such folly, Rothrock took his place and served another three months. One must wonder whether it was courage or madness that drove him back to the battlefield.
Rothrock's path wound through teaching botany before he emerged as a surgeon. His expeditions carried him to untamed landscapes, resulting in the Flora of Alaska—a work as vast as the territory it documented.
It was his appointment as a Michaux Lecturer on Forestry that kindled Rothrock's true passion. Ever the devoted student, he embarked on a nine-month sabbatical to study under the renowned botanist Anton Debary at the University of Strasbourg. The Germans, it seems, knew something about forests that Pennsylvania had yet to learn.
In 1893, our intrepid hero began what might be called his grandest expedition—investigating the plight of Pennsylvania's forests, or "Penn's Woods" as he affectionately termed them. For two years, Rothrock and his associate engineer, William Shunk, documented the pitiful state of these once-magnificent woodlands.
Long before a cartoon bear warned of fire dangers, Rothrock was sounding the alarm with considerably more eloquence:
"Almost every forest fire is the result of ignorance, carelessness, or crime, and that there is some one to punish for it."
Such directness! One can almost see him wagging a disapproving finger at careless campers and negligent loggers alike.
Undeterred by opposition from farmers and timber barons—the latter presumably twirling their mustaches while counting their gold—Rothrock persisted in his mission. In 1901, with the patience of a man who understood that trees take decades to mature, he wrote:
"Twenty years ago I began agitation upon the forestry question, I have kept at it ever since; [...] you have no idea of the amount of work it requires to change a generation from tree destroyers to tree restorers; it is something akin to a second birth."
At the venerable age of seventy, our botanical collector sold his vast herbarium and library to the Field Museum of Natural History in Chicago—a collection boasting 22,207 specimens, including several named in his honor. Imagine, dear gardeners, having Artemisia Rothrockia or Pentstemon Rothrockii gracing your beds! The ultimate immortality for a botanist is, after all, to have one's name forever attached to the plants one cherished.
Rothrock State Forest stands as a living monument to his legacy, while Pennsylvania schools commemorate his birthday—April 9th—as Arbor Day. How fitting that children should plant trees in honor of the man who understood that forests are not inherited from our ancestors but borrowed from our children.

Great article but one off the wall question. What was the name of his beagle companion?
Hi Donald –
Great question. His pup was named Rab – short for rabbit. 🙂
Jennifer