01
Coarse Woody Debris
Fallen Fremont cottonwood log observed on trail — significant coarse woody debris in the riparian zone. The exposed interior shows swirling fibrous wood grain characteristic of cottonwood.
Entry 2 · SAR Trail, CoronaThe Cottonwood Chronicles · Species 01
Fremont
Cottonwood
Populus fremontii
A deciduous riparian tree that makes the watershed's water history visible—in leaf, cotton, cavity, limb, color, and loss.
FamilySalicaceaeCommunityRiparian woodlandSignalWater + temperature
© Lindsey ThomeWhy this tree
A calendar with roots
in moving water.
Fremont cottonwoods depend on reliable access to groundwater and seasonal flow. Their timing registers conditions that are otherwise difficult to see: warming soil, falling water, prolonged heat, and the approach of dormancy.
By returning to the same trees, The Living Calendar can follow not merely a species but particular lives—watching how one canopy responds across seasons and, eventually, across years.
2026 seasonal record
The first year of the chronicle
02
Leafed Out and Dropping Cotton
Fremont cottonwood fully leafed out and simultaneously dropping cotton — the fluffy seed dispersal structures carried on the wind. The deeply furrowed, corky bark of a mature individual visible.
Entry 7 · SAR, Green River Golf Course stretch03
Cotton Dispersal
Arroyo willow loaded with fluffy white seed cotton alongside fresh green catkins.
Entry 31 · SAR corridor, Corona04
Limb Drop and Large Cavity
Fremont cottonwood photographed showing significant limb loss and decay at major branch unions — large cavity visible at the trunk's primary fork. Tree still leafed out and viable.
Entry 55 · SAR, Green River Golf Course05
Field observation
Common fig — a volunteer seedling sprouting from the base of a mature Fremont cottonwood, growing in the crevice between the cottonwood's buttress roots.
Entry 57 · SAR, Green River Golf Course06
Flower Bud Initiation
Yerba mansa — flower buds initiating in the field colony at this location. Pre-bloom stage: buds present, flowers not yet open.
Entry 61 · SAR, Green River Golf Course07
Portrait at Golden Hour
Fremont cottonwood photographed at golden hour — a mature, full-canopied individual standing in the golf course maintained turf, its deeply furrowed pale gray trunk and broad triangular-leaved canopy lit from the west by the setting sun. The tree's full summer canopy in deep green contrasts with the warm yellow of the evening light filtering through the outer leaves.
Entry 100 · Green River Golf Course, Corona08
August Low Water Level, First Yellow Cottonwood Leaves
Santa Ana River photographed from the bridge — the river at August low water level, rock outcrops visible that were not exposed in previous bridge photographs. Riparian canopy in full late-summer leaf on both banks. The Fremont cottonwood beginning to show first yellow leaves of fall color transition at the top left. Green algal mat visible on the exposed mid-river rock. Olive-green still water reflecting the sky.
Entry 109 · SAR, Green River Golf Course stretch, Corona09
Early Fall Color, 100°F Day — PHENOLOGICAL ANOMALY
Fremont cottonwood photographed in early fall color on August 7 — bridge view showing a large individual already in brilliant gold-yellow color alongside still-green individuals; close view showing approximately 50-60% of leaves turned to vivid gold-yellow on a 100-degree day.
Entry 117 · SAR, Green River Golf Course stretch, CoronaA recurring series within The Patient Work
The Cottonwood Chronicles
Periodic essays will return to this tree as weather, water, insects, birds, decay, and dormancy alter its visible life.
Follow the chronicle