# The Take Was Not the Harvest

> A San Francisco grafter keeps a notebook on whether her unions held, and the notebook is good data. It records about six weeks of one branch. The count of trees planted, a million of them in New York by 2015, is being read the same way round.

- Publication: What If? Magazine
- Correspondent: Fat Squirrel
- Vertical: SkunkWERX
- Published: 2026-10-23
- Reading time: 17 min
- Tags: fat-squirrel, almanac-desk, guerrilla-grafters, street-trees, urban-forestry, tree-planting-counts, wrong-arrow
- Canonical URL: https://www.whatifmag.com/blog/the-take-was-not-the-harvest

What If? Magazine publishes speculative journalism written from a 2036
vantage. The reporting and sources are real; the 2036 framing is a
deliberate editorial device, not a claim about the present.

---

Delfina Arriaga grafts in the first warm week of March, and in 2036 that was the week of the ninth. She works the Portola on a bicycle with a canvas knife roll in the frame bag, and she has been cutting scions into San Francisco street trees since 2014. She learned the work from Emmanuel Ocampo, who kept a nursery yard off San Bruno Avenue and who handed her the knife and the rule in the same afternoon.

"If the union takes, the block has a fruit tree."

Arriaga has kept a notebook against it ever since. Tree, date, scion variety, whether the union held through June. [Twenty-two years of entries](https://www.whatifmag.com/blog/the-band-was-a-growth-ring), and the column for what happened after year three is mostly empty. She said so before I asked.

## What would have to be true

The rule is not a figure of speech. A graft transplants an identity. The scion becomes the top of the plant and bears its own variety rather than the host's, and the limit on that is relatedness: varieties within one species unite reliably, two species in one genus may unite weakly or not at all, two families will not unite.[^1] Inside those limits the cut is the whole intervention, and the cut has one requirement. "Cambium contact is the key," as a Wisconsin extension handout puts it.[^2] Lining the two cambial layers up is what lets callus knit the pieces into a single vascular system.[^1] An old tree can be converted a few branches at a time; the guidance for topworking a large one is to graft about half the branches the first year and the rest the next.[^1]

The Guerrilla Grafters built a practice on that. The group formed in San Francisco in 2011 and cut fruiting scions into the city's non-fruiting ornamental apple, cherry and pear trees, with an Asian pear worked into a flowering pear in Hayes Valley as the demonstration case.[^3][^4] Margaretha Haughwout, Tara Hui and Ian Pollock presented it at an electronic art symposium in 2015.[^5] By early 2012 the newsletter list ran to 130 or 140 people with about a dozen regulars at grafting events, and the group counted more than a hundred volunteers across three states.[^4][^6] It grafted only trees that had a committed steward to prune, water and harvest.[^4]

The tactic has a long record under other names, and the record includes the part where an institution absorbs it. The Green Guerillas threw seed bombs of fertiliser, seed and water over the fences of vacant New York lots beginning in 1973, and in April 1974 the city leased one of those lots back to the gardeners for a dollar a month.[^7] Incredible Edible started in Todmorden in 2008 with sweetcorn on unused public ground in front of the police station, signed red, amber and green so passers-by knew when to pick.[^8] A seed library at the Joseph T. Simpson Public Library in Mechanicsburg, Pennsylvania was pulled under the state Seed Act of 2004 until a 2015 coalition letter got the department to accept that a library giving seed away is not a distributor.[^9] Beavers appeared on Devon's River Otter in 2013 with origins that are still unclear, were threatened with removal, licensed in 2014 as a five-year study, then allowed to stay for good in 2020.[^10] England opened licensed wild release in February 2025.[^11]

## What the rule is measuring

The take measures whether two cambium layers stayed in contact long enough to knit, on one branch, in one spring.

[What it gets read as is whether the block gets fruit](https://www.whatifmag.com/blog/the-price-was-a-rain-gauge), and that is a twenty-year question settled by pruning cycles, water, and whoever holds the maintenance contract.

![A black stencil hand presses a cut scion into a notched branch, the union bound with a single band of red tape.](https://www.whatifmag.com/images/articles/the-take-was-not-the-harvest/the-take-was-not-the-harvest--fig1.png)

**Figure 1.** The measurement and the inference. The union is the only part of the sequence that the knife decides.

Ocampo's rule is exact about the cut and silent about everything downstream of it. Even the first crop belongs to somebody else's variable: on one common apple rootstock the extension guidance is no fruit until year four or five.[^2]

## Which way it points, and against what

Backward, at the branch, over about six weeks. Scored against the survival of the tree it is cut into, it carries no information at all.

A planted street tree is not a stable object. Across eleven United States studies, annual street-tree mortality runs 3.5 to 5.1 percent, which puts mean life expectancy at 19 to 28 years and the population half-life at 13 to 20 years. In New York, 26.2 percent of street trees were dead eight to nine years after planting. In West Oakland between 2006 and 2011 annual mortality was 3.7 percent overall and 5.6 percent among trees with trunks of three inches or less, about four times the rate in the larger classes.[^12]

![Bars showing measured street-tree loss: 26.2 percent of New York street trees dead eight to nine years after planting, a population half-life of 13 to 20 years, and annual mortality of 3.5 to 5.1 percent across eleven studies.](https://www.whatifmag.com/images/articles/the-take-was-not-the-harvest/the-take-was-not-the-harvest--fig2.png)

**Figure 2.** Measured loss among planted street trees. The take is a reading on one branch over roughly six weeks.

Then the saw. San Francisco plans routine street-tree pruning on a three to five year cycle depending on species.[^13] A grafted scion is a young shoot on an old frame, which is the thing a crew takes.

Hayes Valley settled it. A video made for a conference demonstration had shown where the grafted trees were. The trees were then severely pruned, every grafted branch removed, and the ripening Asian pears went with them. The group stopped publishing locations.[^4][^6] The unions had held.

![A timeline in years: the take judged in one spring, San Francisco routine pruning every three to five years, no fruit until year four or five on one common apple rootstock, and a street-tree population half-life of 13 to 20 years.](https://www.whatifmag.com/images/articles/the-take-was-not-the-harvest/the-take-was-not-the-harvest--fig3.png)

**Figure 3.** The intervals that decide a harvest, against the interval the rule measures.

The objection was never horticultural. Carla Short, then an urban forester at San Francisco Public Works with 103,000 public trees under her, put it in terms of fallen fruit on a sidewalk: "It gets very dangerous very quickly."[^3] Public Works director Mohammed Nuru was shorter: "The trees that are in the right of way, they're not for grafting."[^14] When Hui asked permission to plant a fruit tree in front of her own house, the answer came back as maintenance and liability, and her offer to carry both did not move it.[^4]

Then the city took the liability itself. Proposition E passed in November 2016 and made San Francisco responsible for every street tree, for sidewalks those trees damaged, and for injury caused by its own failure to maintain one. Until then the city maintained about a third of them and had been relinquishing some 22,000 more to abutting property owners since 2014.[^15] The program began on 1 July 2017 with upwards of 124,000 trees, on 19.7 million dollars in fiscal 2018/19.[^13]

The objection was answered and the grafts still did not fruit, because the party that absorbed the liability also absorbed the saw.

The preference shows up in the plant list. San Francisco's 2021 recommended street-tree species list names the fruitless olive cultivars Swan Hill and Wilsoni, and its one litter note on a Prunus reads "Fruit drop may get messy."[^16]

The ornamental pear was never sterile. A Bradford is self-incompatible, so two of them set no viable seed alone. Once other Callery cultivars and wild seedlings came into pollen range the flowering pears crossed, fruited heavily, and birds carried them into open ground. Clemson's extension service lists the tree as extremely invasive and says it can bear viable fruit in as little as three years.[^17]

The city got the fruit. It arrived by pollen instead of by knife, in the places nobody had chosen.

## The live one

Same arrow, running on a bigger number. Trees planted.

MillionTreesNYC launched in October 2007 and reached its millionth tree on 20 November 2015, two years ahead of schedule: 155,000 street trees, 595,000 park trees, 250,000 on private and other open space, more than 350 million dollars of city money, and close to 50,000 volunteers. The announcement carries no survival figure.[^18]

[The count is honest and it is a count of plantings completed](https://www.whatifmag.com/blog/the-cycle-was-a-funeral-schedule). What it measures is the budget year, the nursery contract and the volunteer turnout in the season the money was spent. What it is read as is canopy, which is a reading on year fifteen. The study that puts New York street-tree mortality at 26.2 percent by year eight or nine locates the losses in young trees in the establishment phase, where it says the payoff from maintenance is largest.[^12]

Arriaga's notebook has a column for the union. Twenty-two years in, it has no column for the crew.

A take is a measurement of a cut. A harvest is a measurement of a crew.

---

**Author's note.** Category: wrong arrow. Delfina Arriaga and Emmanuel Ocampo are a composite drawn from the published record of grafting practice in San Francisco rather than from any one person, and the rule as quoted is composite phrasing rather than a transcription from a named speaker. The Portola, the notebook and the 2036 dates are fictional furniture. Everything attributed to the Guerrilla Grafters is sourced: the 2011 start, the species, the steward system, the membership figures, the Hayes Valley pruning, and the quotations from Short and Nuru. Two sources differ on Hayes Valley. One reports the grafted branches as severely pruned after a video revealed the locations, the other calls the grafts hacked and does not say by whom, so the body reports the outcome and not the hand.[^4][^6] The group's current status is not in the checkable record. Its co-founder now teaches at Colgate, and the most recent sourced activity is the 2015 poster.[^5][^19] Nothing here says the group is or is not still cutting. The topic as filed called the host trees sterile. They are not, and the piece says so.

## Works Cited

[^1]: University of Missouri Extension, publication G6971, on grafting: the cambium of the scion lining up as closely as possible with the cambium of the stock as the condition for a good union, the rule that generally only plants closely related botanically form a good graft union, plants of the same genus and species usually grafting even across varieties while different species in a genus may be weak, short-lived or fail to unite and different families cannot be grafted, the practice of topworking a large tree by grafting about half the branches the first year and the rest the next, and bark grafting being possible only when the bark slips. https://extension.missouri.edu/publications/g6971

[^2]: Fischbach, Jason. "Fruit Tree Grafting." University of Wisconsin-Madison Division of Extension, Bayfield County, 23 April 2020, on "Cambium contact is the key!" for whip grafts, connecting the cambium to create a vascular connection, callus knitting the two pieces together, compatibility running from varieties within a species out to a short list of exceptions including European pear on Asian pear, pear on quince and pear on hawthorn, and no fruit until year four or five on Antonovka rootstock. https://bayfield.extension.wisc.edu/files/2020/05/Fruit-Tree-Grafting_April-23-2020.pdf

[^3]: "Guerrilla Grafters Bring Forbidden Fruit Back To City Trees." NPR, 7 April 2012, as carried by GBH, on grafters cutting a wedge into a twig from a fruit-bearing Asian pear and a groove into a twig on a flowering pear street tree and joining them, Tara Hui's account of a neighbourhood without a supermarket, and Carla Short, an urban forester at the San Francisco Department of Public Works who manages 103,000 public trees, on fallen fruit going slippery on sidewalks, "It gets very dangerous very quickly," the city encouraging fruit in community gardens, and her team looking for the grafters without having found them. https://www.wgbh.org/news/2012-04-07/guerrilla-grafters-bring-forbidden-fruit-back-to-city-trees

[^4]: Larenas, Patricia. "City Fruit: Guerrilla Grafting." Civil Eats, 23 March 2012, on the group having been active since 2011, grafting productive branches onto the city's non-fruiting ornamental apple, cherry and pear trees, a newsletter list of 130 to 140 people with roughly a dozen regulars at grafting events, a lateral structure with no leaders, grafting only trees with a committed caretaker who keeps them pruned, watered and healthy, city administrators citing maintenance and liability when Tara Hui asked to plant a fruit tree in front of her home and refusing after she offered to carry both, a city policy disallowing fruit-producing trees in the absence of any formal law, and the Hayes Valley trees being severely pruned with every grafted branch removed and the ripening Asian pears lost after a conference video inadvertently revealed their locations. https://civileats.com/?p=14391

[^5]: Haughwout, Margaretha Anne, Tara Hui and Ian Pollock. "Guerrilla Grafters." Poster, ISEA2015, 21st International Symposium on Electronic Art, proceedings pages 930 to 932, on grafting fruit-bearing branches onto ornamental fruit trees that do not bear edible fruit, the graft as a rehearsed gesture and social sculpture, an online map under development in San Francisco, and city agencies opposing such acts. https://www.isea-symposium-archives.org/presentation/guerrilla-grafters/

[^6]: Frojo, Renee. "Yes, there is such a thing as a free lunch." Bay Nature, 27 February 2012, on Tara Hui as a founding member, growth from a handful of founders to more than a hundred volunteers across three states, a target of three to four dozen grafted fruit branches around the Bay Area by the end of the season in March, grafting sites in Hayes Valley, Noe Valley, the Portola and Visitation Valley, scion wood from the California Rare Fruit Growers association and backyard gardeners, a steward assigned to each tree for pruning and basic maintenance, several states barring fruit trees in public areas because fallen fruit can attract rodents and insects, and the decision to stop publicising graft locations after grafts in Hayes Valley were hacked. https://baynature.org/2012/02/27/conservation/farming-ranching/yes-there-is-such-a-thing-as-a-free-lunch/

[^7]: "History of the Community Garden Movement." New York City Department of Parks and Recreation, on the Green Guerillas starting in 1973, seed bombs packed with fertiliser, seed and water thrown over fences around vacant lots that could not easily be entered, Liz Christy of Mott Street clearing the lot at Bowery and Houston streets, and the city approving a lease on the Bowery Houston Community Farm and Garden in April 1974 at one dollar a month. https://www.nycgovparks.org/about/history/community-gardens/movement

[^8]: "Pam Warhurst." Royal Horticultural Society, on Incredible Edible being founded in 2008 by Pam Warhurst and a group of friends, the first project growing sweetcorn in front of the police station in Todmorden, West Yorkshire, the use of unused public land, and red, amber and green signs showing whether the sweetcorn was not ready, nearly ready, or ready to pick. https://www.rhs.org.uk/garden-inspiration/people-making-a-difference/pam-warhurst

[^9]: "Seed Libraries in Pennsylvania Allowed to Engage in Free Seed Exchange." Public Interest Law Center, on the Pennsylvania Department of Agriculture applying the Seed Act of 2004 to the seed library at the Joseph T. Simpson Library in Mechanicsburg, the 2015 letter to Secretary of Agriculture Russell C. Redding from a coalition led by the Pennsylvania Association for Sustainable Agriculture, Grow Pittsburgh and the Public Interest Law Center, and the department's determination that the library is not a distributor under the Seed Law because it does not sell or offer seed for sale. https://pubintlaw.org/cases-and-projects/seed-libraries-in-pennsylvania-allowed-to-engage-in-free-seed-exchange/

[^10]: University of Exeter news archive, 6 August 2020, on the River Otter beavers: the animals found on the river in 2013, the statement that "The population's origins are still unclear and at first they were threatened with removal by officials," the 2014 government licence allowing them to stay and be studied over five years, the River Otter Beaver Trial led by Devon Wildlife Trust with the University of Exeter, Clinton Devon Estates and the Derek Gow Consultancy, and the Defra announcement that the beavers can remain permanently in East Devon. https://news-archive.exeter.ac.uk/2020/august/title_808600_en.html

[^11]: "Wild beavers, nature's engineers, to return to English waterways." Department for Environment, Food and Rural Affairs, 28 February 2025, on allowing Eurasian beavers to return to the wild in England under licence from Natural England, the requirement for a ten-year project plan before a licence is considered, the first wild release expected at Purbeck Heaths National Nature Reserve under a licence to the National Trust, and a first-round expression of interest deadline of 2 May 2025. https://www.gov.uk/government/news/wild-beavers-natures-engineers-to-return-to-english-waterways

[^12]: Roman, Lara A. "How Many Trees Are Enough? Tree Death and the Urban Canopy." Scenario Journal, Scenario 04: Building the Urban Forest, 2014, USDA Forest Service Philadelphia Field Station, on a meta-analysis of eleven United States street-tree studies giving annual mortality of 3.5 to 5.1 percent, mean life expectancy of 19 to 28 years and a population half-life of 13 to 20 years, 26.2 percent of New York street trees dead eight to nine years after planting, West Oakland street trees at 3.7 percent annual mortality from 2006 to 2011 with 5.6 percent in the smallest size class of trunks three inches or less, and extra vigilance during the establishment phase as where maintenance and stewardship may have the greatest payoff for survival. https://www.fs.usda.gov/nrs/pubs/jrnl/2014/nrs_2014_roman_001.pdf

[^13]: "StreetTreeSF Annual Report, Fiscal Year 2018/2019." San Francisco Public Works, on Public Works beginning street tree maintenance and tree-related sidewalk repair on 1 July 2017 after voters approved Proposition E in November 2016, responsibility for upwards of 124,000 street trees citywide against about 30,000 maintained before that date, routine pruning planned on a three to five year cycle depending on tree species, and a dedicated annual fund of 19.7 million dollars for fiscal 2018/19 against actual expenditures of 19.4 million. https://mail.sfpublicworks.org/sites/default/files/Street%20Tree%20SF%20Annual%20Report%20FY2018_2019_FINAL%20Revised.pdf

[^14]: "Renegade arborists creating forbidden fruit in San Francisco." San Francisco Examiner, undated online version, on a few dozen members grafting fruit-producing branches onto ornamental pear and plum trees in four San Francisco neighbourhoods, an Asian pear in Hayes Valley that flowered and produced fruit, a steward assigned to each tree to collect fruit, prune and check for disease, an urban orchard database under construction, and Public Works Director Mohammed Nuru saying "The trees that are in the right of way, they're not for grafting," describing such vandalism as a serious offence, and citing fines for damage to city property. https://www.sfexaminer.com/news/renegade-arborists-creating-forbidden-fruit-in-san-francisco/article_9e7e4d43-1c91-5ed7-855e-503b20c68b03.html

[^15]: "Prop E: Street Trees." SPUR voter guide, November 2016, on Proposition E making the city responsible for maintaining all street trees, repairing sidewalks damaged by trees and assuming liability for property damage or injury caused by the city's failure to maintain a street tree, the city having maintained about one third of street trees beforehand, the relinquishment policy begun in 2014 that transferred about 22,000 trees to abutting property owners, and a 19 million dollar General Fund set-aside against roughly 6.5 million already being spent each year. https://www.spur.org/voter-guide/2016-11/prop-e-street-trees

[^16]: "2021 Recommended Street Tree Species List." San Francisco Urban Forestry Council, approved 22 June 2021, on the listing of fruitless olive, Olea europaea, with the Swan Hill and Wilsoni cultivars preferred, and the note on Prunus lyonii, Catalina cherry, that "Fruit drop may get messy." https://mail.sfpublicworks.org/sites/default/files/sf_street_tree_species_list_2021_final.pdf

[^17]: "About Flowering Pears." Clemson University Cooperative Extension, on Callery pear being brought to the United States in the early 1900s to combat fire blight in European pears, the Bradford selection becoming a widely planted ornamental, Bradford pears being self-incompatible so that two Bradford trees alone will not produce viable fruit, cross-pollination among Pyrus calleryana cultivars and spreading wild Callery pears producing abundant fruit that birds disperse, suckering from cut stumps and surface roots, the designation of the tree as extremely invasive, and viable fruit in as little as three years. https://clemson.edu/extension/bradford-pear/flowering-pear-trees.html

[^18]: "Mayor de Blasio Celebrates One Millionth Tree with Former Mayor Michael Bloomberg, Bette Midler." Office of the Mayor, City of New York, 20 November 2015, archived in the New York City Government Publications Portal, on MillionTreesNYC launching in October 2007 and reaching one million trees two years ahead of schedule, the millionth an American linden at Joyce Kilmer Park in the Bronx, 155,000 street trees, 595,000 park trees and 250,000 trees on private and other open space, more than 350 million dollars allocated through PlaNYC with about 30 million in private funds from the New York Restoration Project, nearly 50,000 citizen volunteers, and the absence of any survival or mortality figure for the planted trees. https://a860-gpp.nyc.gov/downloads/1n79h641c?locale=en

[^19]: "Grafters X Change Builds Community Resiliency." Colgate University, on Margaretha Haughwout, Assistant Professor of Art and Art History, having co-created the Guerrilla Grafters while in the San Francisco Bay Area before moving to central New York, and the group described as an art-activist collective grafting fruit-bearing branches onto urban trees that do not produce fruit. https://www.colgate.edu/news/stories/grafters-x-change-builds-community-resiliency