Ficus palmeri (rock fig)

A strangler fig native to the Baja California peninsula, Mexico, known as the rock fig or tescalama, which can spend its entire life dwarfed on a bare rock face or grow into a large tree if its roots reach soil or water.

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Location

Baja California peninsula, Mexico

Country

Mexico

Scientific name

Ficus palmeri

Common names

Rock fig; tescalama

Family

Moraceae

Growth habit

Strangler/rock fig — a saxicole that germinates on bare rock or cliff faces

Size

Held at the University of Arizona Campus Arboretum as accession 18988; capable of reaching 20-50 feet where roots reach soil, though wild rock-bound specimens usually stay much smaller

Cold hardiness

Hardy to about 28 degrees Fahrenheit, per the University of Arizona Campus Arboretumstated by the subject

Overview

Ficus palmeri, known as the rock fig or tescalama, is a strangler fig native to the Baja California peninsula in Mexico, in the family Moraceae (Arizona-Sonora Desert Museum; University of Arizona Campus Arboretum).

Growth on bare rock

Unlike typical tropical strangler figs, which germinate on host trees, Ficus palmeri seedlings establish directly on cliff faces and boulders. Without access to moist soil, a plant can remain a dwarfed, rock-bound saxicole for its entire life; individual specimens are described as capable of clinging to a hilltop boulder for centuries. Where roots eventually reach soil or a streambed, the same species can instead grow into a substantial tree, potentially reaching 20 to 50 feet (Arizona-Sonora Desert Museum; University of Arizona Campus Arboretum).

Description and cultivation

Mature plants have large, dark green, fuzzy leaves that are ovate to cordate in shape, yellowish and sometimes scaly bark, and, in older specimens, a large swollen caudex. The University of Arizona Campus Arboretum, which holds a specimen under accession number 18988, notes it prefers rocky, well-drained soil and partial shade, tolerates moderate drought, is hardy to about 28 degrees Fahrenheit, and is commonly grown as a bonsai subject (University of Arizona Campus Arboretum).

What this profile does not claim

This profile relies on two institutions’ own collection and program records rather than an independent journalistic or academic source, since none specific to this species was located in this research pass. It does not state a conservation status, since no formal assessment could be found. A University of Arizona “State Champion/Heritage tree” certificate identified during research names a rock fig of the closely related species Ficus petiolaris, not Ficus palmeri, and is therefore not cited here to avoid misattributing that recognition.

What we could not verify

These claims came up in research and could not be confirmed. They are recorded here rather than published as fact or quietly dropped. If you hold a source that settles one, please tell us.

Sources

2 sources (2 tier 1), each opened and read against the claim it supports. Every source is independent of the subject; no first-party material is cited. See the source policy.

Both sources used are the institutions' own collection/program records — the Arizona-Sonora Desert Museum's public program page on rock figs and the University of Arizona Campus Arboretum's accession record — each fetched and read in full. No independent (non-institutional) journalism or academic taxonomic publication specific to this species was located in this research pass, so no tier2 source is cited; both sources here are institutional/academic bodies describing a specimen in their own collection or program, graded tier1 as with other museum and university collection records used elsewhere on this site.