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Taking Measure

Just a Standard Blog

The Tangled Tale of NIST’s Newton Apple Tree

an apple tree standing in a courtyard with the sun streaming through its leaves

NIST Gaithersburg’s Newton apple tree on a spring morning. Like its more famous ancestor, the tree continues to produce apples, although they taste terrible. The deer don’t seem to mind, though.

Credit: Stoughton/NIST

Retired West Virginia Senator Jay Rockefeller, himself the scion of a long and storied family tree, is among those to whom the National Institute of Standards and Technology (NIST) has bestowed a scion of a different sort: a clone of an apple tree that was growing next to the house in Lincolnshire, England, where Isaac Newton was born in 1643.

The tree, a variety variously called the “Flower” or “Pride” or “Beauty” of Kent, fell over around 1814, but it was propped up by locals until it was again knocked down during a severe thunderstorm around 1820 … and still the tenacious tree managed to re-root itself and continues to stand, guarded by a short wicker fence, today.

Legend has it that the idea of gravity came to young Isaac when he was struck on the head by a falling apple while reclining under the tree. Newton himself said that he simply saw one of its apples fall to the ground while on furlough from Cambridge University, which was closed due to the Great Plague of London in 1665-66.

Seeing how the apple was drawn toward the center of the Earth, Newton began to wonder if the same force that drew upon the apple also drew upon the moon and the planets. It was from there that he began to untangle the problem of gravity, resulting finally in his famous Principia, the first edition of which was published in 1687.

The rest, as they say, is history.

And like history often is, the story of how NIST came into possession of a clone of this famous tree is as tangled as its searching roots.

An apple tree with most of it's trunk laying on the ground growing outside of Issac Newton's birthplace
Weathered and withered, but still producing leaves and apples, the tree that Newton contemplated is now more than 350 years old.
Credit: Arthurmarris/CC BY-SA 3.0

Apple of the Eye

What seems mostly certain is that either the Turnor family, who took over the house after the Newtons, or the first Earl of Brownlow, John Cust, or one of his underlings, took cuttings from the only apple tree in the vicinity of Newton’s home, Woolsthorpe Manor, around when the tree blew down the second time. Those cuttings were nurtured in the kitchen garden of the earl’s manor in nearby Belton, where they flourished until cuttings were taken to the East Malling Research Station and Kew Gardens just before the outbreak of World War II in 1939.

Shockingly, two or more of the trees from the East Malling stock were exported to the U.S. during the height of World War II in 1943-44. Clarence A. Reed, an employee of the U.S. Department of Agriculture’s Henry A. Wallace Beltsville Agricultural Research Center in Beltsville, Maryland, was likely the person who arranged to have these trees brought to him through hostile, submarine-infested waters. One tree was planted at William Penn’s Pennsylvania estate, Pennsbury Manor. Reed took another of the imported Newton trees and planted it in Takoma Park, Maryland, around 1947.

ortrait of man in black with shoulder-length, wavy brown hair, a large sharp nose, and a distracted gaze
The inestimable Sir Isaac Newton circa 1689.
Credit: Sir Godfrey Kneller

Eight years later, Louis Essen of the U.K.'s National Physical Laboratory (NPL) built the first atomic clock accurate enough to be used as a time interval standard. Around that same time, NIST researcher Irving Gardner was visiting NPL as part of his effort to more accurately measure the gravitational constant, affectionately known as “Big G.” NPL had acquired a Newton apple tree from Kew Gardens in the 1940s, and Gardner became enthralled with the idea of having one on the NIST campus as well.

(Incidentally, NIST researchers are once again in the process of measuring Big G. I wish them great success.)

Upon his return to the U.S., Gardner planted the seed among his colleagues about the possibility of acquiring a clone of the NPL tree for the NIST campus, which was then called the National Bureau of Standards (NBS) and located in Washington, D.C., on the site of what is today the campus of the University of the District of Columbia.

Before arrangements to have a tree sent over from England were made, “someone” remembered there was a Newton apple tree in Takoma Park. A search party was organized, a tree located, four grafts taken, and one planted next to the NIST building where the constant of gravity was being re-determined in 1957.

The occasion was one of much fanfare, at least among the employees and a student tour group that happened to be there that day.

Seeds of Doubt

This tree was initially regarded as genuine. But sometime shortly thereafter, NIST Director Allen Astin inspected the pear-shaped fruit of the tree taken from Takoma Park, and, skeptical as scientists are apt to be, wondered aloud about the tree’s heredity. At this, another request for scions from the original Woolsthorpe-Brownlow-East Malling stock were sent, and new saplings procured in 1960. They were nurtured at the Beltsville, Maryland, agricultural research center before one was planted on the new NIST campus in Gaithersburg in 1966 or 1967, where it stands, listing only slightly, to this day.

photograph portrait of a middle-aged, bespectacled man
Allen Astin was director of NIST from 1951 until 1969. 
Credit: NIST

The tree at Pennsbury died in 1988 and was replaced with a graft from the NIST Gaithersburg tree.

The clone of the Takoma Park tree that was planted at NIST’s Boulder, Colorado, laboratory, the same progeny that Astin wondered aloud about, did eventually prove to be an imposter—an ornamental crabapple tree—and was replaced with a sapling from Gaithersburg in 1978.

(Sadly, the Boulder clone has since gone to the great orchard in the sky and will need replacing.)

Frontiers and Traditions

Despite all the intrigue surrounding this tree’s family … tree, the trees now under NIST’s control are in fact the real thing. There is even a secret grove of them growing somewhere on NIST’s Gaithersburg campus that are given out as gifts to assorted luminaries.

Recipients of NIST’s Newton apple tree clones include Sen. Rockefeller, who donated his tree to West Virginia University; former Undersecretary of Commerce Ed Vetter, who donated his to the Massachusetts Institute of Technology; former NIST Director Pat Gallagher, who donated his to the University of Pittsburgh; former Secretary of Commerce Donald Evans, who donated his to the University of Texas; and co-founding father of the internet (and former chair of the NIST Visiting Committee on Advanced Technology) Vinton Cerf, who donated his to Stanford University.

As the plaque near the NIST Gaithersburg tree reads, “Science has its traditions as well as its frontiers.” I hope this tradition will continue far into the future and that the descendants of this humble hardwood will continue to inspire scientific discovery at NIST and everywhere its scions have set down roots.

*Edited Jan. 24, 2024, to correct the misstatement that the tree that was originally planted at Pennsbury was not genuine. 

About the author

Mark Esser

Mark Esser has been a writer/editor in the NIST Public Affairs Office since October 2007. He has written internal and external news, video scripts,  speeches and other content on a wide variety of subjects. He helped to initiate and served as contributing and managing editor of the NIST Taking Measure blog from 2016 until 2021. He now works in NIST internal communications. 

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Thanks to the good offices of Steve Carpenter, long-time Director for International and Academic affairs at NIST, CENAM, the Mexican National Institute of Metrology, received a clone of NIST´s Newton apple tree in 1993. It still stands in Queretaro and looks very healthy.

Excellent! Thank you for the report! I'm happy to hear that it is doing well, and I hope it will continue to inspire and provide shade for your staff for many years to come. It would be great to hear from other recipients and get reports on the health of the other trees out there.

The product of the dimensions of gravity and force is interesting. [G ] * [ F ] = [ L^4 * T^-4] = c^4.
See Woan's "Cambridge Handbook of Physics Formulas. Very Newton, to be sure.
Problem is, American levitation research is compelling and hopefully, ultimately solvable. We'd like to replace rockets with fusion powered anti gravity saucer-ships, a noble dream. That may mean changing the space-ship from a rod to a disk is actually part of the solution, because the dimensions of the rocket are length and force. Maybe they should be area and -- force, or at least lift. That and other possibilities are precluded without better abstraction of the situation, and the basis for solving these problems in the future are more carefully - and courageously - understood. American, constitutional physics, independent of British tradition, is essential.

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