Field Observations

Phenology Log

Ground-truth phenological observations from the Puget Sound lowlands, paired with Growing Degree Day accumulations.

April 2026
Tue, Apr 7 1273 GDD₃₂ ● new growth flush BBCH 11 Leaf development
Rugosa Rose new growth flush observed 2026-04-07
Rosa rugosa · Rugosa Rose
Issaquah Confirmed
EXIF: 2026-04-07 08:38:54, Issaquah, WA (0.0 mi from station). Vigorous new compound leaves expanding from thorny canes. Ivy groundcover visible. Batch caption workflow.
Tue, Apr 7 1273 GDD₃₂ ● bud swell + new leaves BBCH 07/11 Bud development
Miss Kim Lilac bud swell + new leaves observed 2026-04-07
Issaquah Confirmed
EXIF: 2026-04-07 08:39:35, Issaquah, WA (0.0 mi from station). Flower buds forming on panicle, purple-tinged. New leaves expanding. Batch caption workflow.
Mon, Apr 6 1254 GDD₃₂ ● bud break BBCH 07 Bud development
Bigleaf Maple bud break observed 2026-04-06
Acer macrophyllum · Bigleaf Maple
Issaquah Confirmed
EXIF: 2026-04-06 12:11:33, Issaquah, WA (0.0 mi from station). Large sticky buds cracking open, bright green leaf tissue emerging. Key native canopy species. Batch caption workflow.
Thu, Apr 2 1162 GDD₃₂ ● flower buds BBCH 51 Inflorescence emergence
Viburnum davidii flower buds observed 2026-04-02
· Viburnum davidii
Issaquah Confirmed
EXIF: 2026-04-02 13:58:54, Issaquah, WA (0.0 mi from station). Pink bud clusters visible, not yet open. Wet foliage. Batch caption workflow.
Thu, Apr 2 1162 GDD₃₂ ● new leaves BBCH 11 Leaf development
Japanese Snowbell new leaves observed 2026-04-02
Styrax japonicus · Japanese Snowbell
Issaquah Confirmed
EXIF: 2026-04-02 13:59:39, Issaquah, WA (0.0 mi from station). Small leaves emerging from buds on bare branch. Batch caption workflow.
March 2026
Sat, Mar 28 1023 GDD₃₂ ● new leaf BBCH 11 Leaf development
Japanese Spindle new leaf observed 2026-03-28
Kent Area Confirmed
EXIF: 2026-03-28 18:13:11, 47.3846°N 122.2352°W (Kent, 0.3 mi from station). Bright chartreuse-yellow new leaves emerging, contrasting with mature dark green variegated foliage. GDD₃₂ estimated (Kent Mar 27: 1009.4 + ~14/day trend).
Sat, Mar 28 1023 GDD₃₂ ● leaf emergence + flower bud BBCH 11 Leaf development
Japanese Barberry leaf emergence + flower bud observed 2026-03-28
Kent Area Confirmed
EXIF: 2026-03-28 18:14:35, 47.3849°N 122.2347°W (Kent, 0.3 mi from station). Leaves emerging with flower buds visible. Second observation for this species (first: 'Crimson Pygmy' Mar 21 Kent at ~915 GDD₃₂). Same station, ~108 GDD₃₂ later; difference likely reflects cultivar variation ('Golden Ruby' vs 'Crimson Pygmy'). GDD₃₂ estimated (Kent Mar 27: 1009.4 + ~14/day trend).
Fri, Mar 27 1062 GDD₃₂ ● new leaf + flower bud BBCH 11/51 Leaf development
Johanna Azalea new leaf + flower bud observed 2026-03-27
Issaquah Confirmed
EXIF: 2026-03-27 10:42:22, Issaquah, WA (0.0 mi from station). Bright green new leaves expanding; small red flower bud visible at center of leaf whorl. Evergreen azalea preparing to bloom. GDD₃₂ estimated (Issaquah Mar 26: 1061.7).
Thu, Mar 26 988 GDD₃₂ ✾ full bloom BBCH 65 Flowering
Yoshino Cherry full bloom observed 2026-03-26
Prunus ×yedoensis · Yoshino Cherry
Olympia Confirmed
EXIF: 2026-03-26 14:47:09, WA State Capitol Campus, Olympia (Olympia station, 0.2 mi). Heavy white bloom on bare branches framing the capitol dome. Second full bloom observation for this species (first: Kent area Mar 21 at ~915 GDD₃₂). Olympia ~73 GDD₃₂ behind Kent at same event, consistent with cooler south Sound climate. Photo credit: B. Welch. GDD₃₂ estimated (Olympia Mar 25: 987.6).
Thu, Mar 26 983 GDD₃₂ ● bloom start + leaf emergence BBCH 61 Flowering
Callery Pear bloom start + leaf emergence observed 2026-03-26
Kent Area Confirmed
EXIF: 2026-03-26 18:23:51, Kent area (3.1 mi from station). White flowers opening with pink buds still present; new leaves emerging simultaneously (synanthous). Early bloom stage. GDD₃₂ estimated (Kent Mar 25: 983.1).
Mon, Mar 23 1018 GDD₃₂ ✾ full bloom BBCH 65 Flowering
Japanese Camellia full bloom observed 2026-03-23
Camellia japonica · Japanese Camellia
Issaquah Confirmed
EXIF: 2026-03-23 11:07:07, 47.4916°N 122.0259°W (Issaquah, ~1.4 mi from station). Pink semi-double flower with exposed yellow stamens; additional buds visible. March bloom consistent with C. japonica (typical Feb-Apr in 8b). GDD₃₂ from Issaquah station. Originally reported as C. sasanqua; corrected to C. japonica based on bloom timing.
Sun, Mar 22 930 GDD₃₂ ◐ bud swell BBCH 51 Inflorescence emergence
Flowering Dogwood bud swell observed 2026-03-22
Cornus florida · Flowering Dogwood
Kent Area Confirmed
EXIF: 2026-03-22 12:38:41, Kent area (3.1 mi from station). Large globular inflorescence buds visibly swelling on bare branches, not yet opening. GDD₃₂ estimated (Kent Mar 21: 929.7, today's not yet captured).
Sun, Mar 22 930 GDD₃₂ ◐ bud swell BBCH 01 Bud development
Thornless Cockspur Hawthorn bud swell observed 2026-03-22
Crataegus crus-galli var. inermis · Thornless Cockspur Hawthorn
Kent Area Confirmed
EXIF: 2026-03-22 12:36:41, Kent area (3.1 mi from station). Early buds starting to move on bare branches. Persistent haws from last season still attached. Background shows neighboring trees in bloom. GDD₃₂ estimated (Kent Mar 21: 929.7).
Sun, Mar 22 930 GDD₃₂ ● new leaf BBCH 11 Leaf development
Gooseberry new leaf observed 2026-03-22
Kent Area Confirmed
EXIF: 2026-03-22 12:52:19, Kent area (3.0 mi from station). New leaves emerging. GDD₃₂ estimated (Kent Mar 21: 929.7).
Sun, Mar 22 930 GDD₃₂ ◐ bud swell BBCH 51 Inflorescence emergence
Apple bud swell observed 2026-03-22
Kent Area Confirmed
EXIF: 2026-03-22 12:52:52, Kent area (3.0 mi from station). Inflorescence buds swelling on spur wood. GDD₃₂ estimated (Kent Mar 21: 929.7).
Sat, Mar 21 979 GDD₃₂ ● bud break BBCH 07 Bud development
Chinese Pear bud break observed 2026-03-21
Issaquah Confirmed
EXIF: 2026-03-21 10:11:04, Issaquah, WA. Very early bud break for Asian pear cultivar. Using Mar 20 cumulative GDD₃₂ (978.8); Mar 21 daily data pending weather capture.
Sat, Mar 21 915 GDD₃₂ ● new leaf BBCH 11 Leaf development
Wintercreeper new leaf observed 2026-03-21
Kent Area Confirmed
EXIF: 2026-03-21 11:03:33, Kent area (4.8 mi from station). Bright green new leaves emerging among winter-purpled older foliage. GDD₃₂ estimated (Kent Mar 19: 914.8, today's not yet captured).
Sat, Mar 21 915 GDD₃₂ ❀ early bloom BBCH 61 Flowering
Oregon Grape early bloom observed 2026-03-21
Kent Area Confirmed
EXIF: 2026-03-21 11:03:15, Kent area (4.8 mi from station). Yellow flower clusters opening among winter-tinted foliage. GDD₃₂ estimated (Kent Mar 19: 914.8, today's not yet captured).
Sat, Mar 21 915 GDD₃₂ ✾ full bloom BBCH 65 Flowering
Yoshino Cherry full bloom observed 2026-03-21
Kent Area Confirmed
EXIF: 2026-03-21 11:03:49, Kent area (4.8 mi from station). Heavy bloom on bare branches, no leaves yet. White-pink single flowers. Two photos (IMG_3398 close-up, IMG_3400 canopy). GDD₃₂ estimated (Kent Mar 19: 914.8).
Sat, Mar 21 915 GDD₃₂ ● new leaf BBCH 11 Leaf development
Bumald Spirea new leaf observed 2026-03-21
Kent Area Confirmed
EXIF: 2026-03-21 11:06:30, Kent area (4.8 mi from station). Bright chartreuse-gold new leaves emerging along bare stems. GDD₃₂ estimated (Kent Mar 19: 914.8).
Sat, Mar 21 915 GDD₃₂ ● leaf emergence + flower buds BBCH 11 Leaf development
Japanese Barberry leaf emergence + flower buds observed 2026-03-21
Kent Area Confirmed
EXIF: 2026-03-21 11:06:38, Kent area (4.8 mi from station). Small deep-red leaves and flower buds emerging simultaneously along thorny stems. Synanthous. GDD₃₂ estimated (Kent Mar 19: 914.8).
Sat, Mar 21 911 GDD₃₂ ✾ full bloom BBCH 65 Flowering
Border Forsythia full bloom observed 2026-03-21
Tacoma / South Puget Confirmed
EXIF: 2026-03-21 11:06:30, Graham, WA (Tacoma station, 14.0 mi). EXIF GPS unreliable (showed Covington area); actual location confirmed as Graham by observer. Dense golden-yellow flowers covering stems. Key phenological indicator species: forsythia bloom signals crabgrass pre-emergent window and other pest emergence thresholds.
Fri, Mar 20 959 GDD₃₂ ✾ full bloom BBCH 65 Flowering
Japanese Pieris full bloom observed 2026-03-20
Pieris japonica · Japanese Pieris
Issaquah Confirmed
EXIF: 2026-03-20 08:31:49, Issaquah, WA. Heavy drooping panicles fully open, white urn-shaped flowers. Last year's seed capsules still visible.
Fri, Mar 20 959 GDD₃₂ ● bud break BBCH 07 Bud development
Tall Stewartia bud break observed 2026-03-20
Stewartia monadelpha · Tall Stewartia
Issaquah Confirmed
EXIF: 2026-03-20 08:33:01, Issaquah, WA. Elongated buds splitting, green tips visible.
Thu, Mar 19 958 GDD₃₂ 🌱 leaf push BBCH 10 Leaf development
Parrotia persica 'Vanessa' · Persian Ironwood
Issaquah Confirmed
Leaves just emerging. GDD₃₂ estimated (Mar 18: 937.4 + ~20/day trend).
Tue, Mar 17 ~est. 914 GDD₃₂ ✿ first bloom BBCH 61 Flowering
Prunus salicina 'Santa Rosa' · Santa Rosa Plum
Issaquah Confirmed
Started blooming 2 days ago as of Mar 19. No profile yet for this cultivar.
Tue, Mar 17 ~est. 914 GDD₃₂ 🌱 leaf push BBCH 10 Leaf development
Syringa vulgaris · Common Lilac
Issaquah Confirmed
Leaf push starting in last 3 days as of Mar 19. Conversion file predicts first bloom at 973 GDD₃₂ / Mar 25 - leaf push before bloom is consistent.
Mon, Mar 16 ~est. 895 GDD₃₂ ✿ first bloom BBCH 61 Flowering
Red Flowering Currant first bloom observed 2026-03-16
Ribes sanguineum · Red Flowering Currant
Issaquah Confirmed
Started blooming this week as of Mar 19. Key PNW native indicator species.
Sat, Mar 14 ~est. 864 GDD₃₂ ✿ first bloom BBCH 61 Flowering
Red Maple first bloom observed 2026-03-14
Acer rubrum · Red Maple
Issaquah Confirmed
Started blooming in the last 6 days as of Mar 19. Midpoint ~Mar 14. Conversion file predicted 552 GDD₃₂ / Feb 22 - was 35% low.
January 2026
Thu, Jan 22 256 GDD₃₂ ✿ first bloom BBCH 61 Flowering
Hybrid Witch Hazel first bloom observed 2026-01-22
Hamamelis ×intermedia 'Diane' · Hybrid Witch Hazel
Issaquah Confirmed
EXIF: 2026-01-22 11:15:10, Issaquah, WA. Deep red flowers, classic winter bloom.
July 2025
Thu, Jul 17 3698 GDD₃₂ ❀ early bloom BBCH 63 Flowering
Oakleaf Hydrangea early bloom observed 2025-07-17
Issaquah Confirmed
EXIF: 2025-07-17 06:48:11, Issaquah, WA. GDD₃₂ from Kent (no Issaquah 2025 data).