06/26/2026
In 1892, San Diego owned 1,400 acres of dead dirt. The woman who built Balboa Park offered to pay her rent in trees.
The city council accepted the deal without much debate. They had a massive, barren mesa sitting directly above the downtown area. They called it City Park on the official maps, but nobody actually went there. It was covered in brittle sagebrush, wild mustard weeds, and rattlesnakes. The soil was a baked adobe crust.
The local government had zero dollars to plant anything.
Kate Sessions needed acreage. She was a botanist who had run out of room. She had graduated from the University of California in 1881, earning a science degree at a time when women were heavily discouraged from the program.
She spent her early career teaching high school in a dusty coastal town, but she hated the classroom. The indoor air felt stagnant. She preferred the soil.
She bought a small flower shop in San Diego, which she expanded into a working nursery. But her business required space to grow larger species. She looked at the empty, baked earth of the city's unused tract.
She wrote a formal proposal. She asked to lease thirty-two acres of the worst land on the mesa. She didn't offer money. In exchange for the space, she would plant one hundred trees in the park every single year. She would also donate three hundred more trees annually to be planted across the rest of the city, at schools and along the dirt roads.
The ground was solid hardpan. A standard steel shovel couldn't break the crust.
She hired local laborers with heavy iron picks to shatter the topsoil. The sun was brutal. When the men quit because of the heat, she stayed on the mesa. She was thirty-five years old. She took the tools and dug the holes herself.
There was no municipal irrigation system running to the tract. The city had promised a water line, but the pressure was weak and inconsistent. She dragged heavy rubber hoses from a single distant spigot. When the pipes failed completely on Tuesday afternoons, she filled metal buckets and carried the water by hand.
She knew the local oak and pine wouldn't survive the exposed mesa without constant care. She needed species that understood drought.
She studied the global latitude lines. She realized the region shared a climate with specific coastal areas halfway across the world. She imported seeds from climates that matched the arid Southern California coast. She ordered heavy shipments from Australia, South America, and South Africa. Most people in the city had never seen the strange, exotic species she was dropping into the dirt.
At the time, municipal landscaping budgets in the American West were virtually nonexistent. The 1892 San Diego city council records show they had designated the tract as a park twenty-four years prior, but allocated exactly zero dollars for its development. City planners of the era viewed civic beautification as a private luxury, not a public necessity. The land was legally designated as a park, but physically remained a desert. The city relied entirely on private citizens to build public infrastructure.
She planted eucalyptus for shade. She planted Monterey cypress for windbreaks. She dropped Brazilian jacaranda seeds into the broken earth.
The woman who built Balboa Park was not a gentle or accommodating figure. She was notoriously brusque with the customers at her nursery. She didn't suffer fools, and she had no patience for people who didn't understand soil composition.
If she visited a buyer's house and didn't like where they had placed one of her ferns, she would pull a trowel from her pocket, dig it up, and move it to a better location herself.
She cared about root systems, not social graces. Her clothes were constantly ruined by the work. She wore heavy, scuffed boots and kept a sharp pruning knife on her belt at all times.
In 1895, the first eucalyptus trees were knee-high.
By 1900, they cast a narrow shadow across the dirt.
By 1905, she was planting cork oaks and twisted junipers.
By 1910, the barren mesa was shielded from the coastal wind by a massive canopy of green.
She introduced the bright purple bougainvillea that now covers the city's stucco walls. She brought the bird of paradise from South Africa, which eventually became the city's official flower.
She spent forty years with dirt permanently packed beneath her fingernails.
The city provided the dirt. She provided the decades.
When San Diego prepared to host the 1915 Panama-California Exposition, the world arrived to inspect the grounds. They expected to find a dusty border town. Instead, they walked into a lush, towering tropical oasis.
The city fathers renamed the area Balboa Park. They built elaborate Spanish-style pavilions and gave long civic speeches under the shade of the trees she had watered by hand. The municipal government took the credit for the vision, printing brochures that advertised the city as a natural paradise.
She simply went back to work.
She kept planting. She moved her nursery to different lots as the city expanded, always leaving the land greener than she found it.
She worked until she was eighty-two years old. She walked the public grounds with a wooden cane, still bending down to check the soil moisture. If she saw a dead branch on a city tree, she walked into the government offices and demanded a worker cut it down immediately.
She died in 1940. She never married. She left no children.
Today, the city pays a massive, fully-funded parks department to maintain the grounds. Millions of international tourists walk under the canopy of Balboa Park every year. They sit in the shade. They take photographs of the jacarandas blooming in the spring.
The original lease agreement she signed with the city is sitting in a municipal archive. It expired a century ago.
The trees are still there.
Kate Sessions: the woman who paid her rent in trees.
Source: San Diego History Center archives.
Verified via: The Journal of San Diego History, Balboa Park Conservancy records.
(Some details summarized for brevity.)
