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Puget Sound Region
Plant profiles, disease identification, pest management, and seasonal care guides written for this climate, this soil, these conditions.
Featured Guide
Growing degree days are the accumulated heat units that drive every biological event in your landscape. HortGuide uses base 32°F for maritime climates. This guide explains the calculation, the conversion methodology, source data, and how to read the season tracker.
Your grape variety determines your pruning method. Learn spur pruning vs. cane pruning, wet-climate timing to prevent trunk disease, and a variety-by-variety reference table for the Puget Sound lowlands.
Read more →One p or two? The abbreviations sp. and spp. after a genus name mean different things. Learn the distinction, the Latin behind it, and how to read them on nursery tags, lab reports, and pesticide labels.
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Every nursery tag carries four layers of naming. One of them predicts how the plant will perform in your yard. Learn to decode species, cultivar, trade name, and patent so you buy exactly what you intend.
Read more →Seasonal scouting notes, spray timing updates, and the regional detail that national guides leave out. Written for Western Washington gardeners and landscape professionals.
Seasonal scouting notes, timing updates, and the regional detail that national guides leave out. Delivered when it matters.
Species selection, siting, and care for this climate.
Identification, timing, and management grounded in regional extension data.
Scouting, thresholds, and IPM for the pests that actually matter here.
A growing dataset of plants, diseases, and pests tracked for this region. Profiles deepen continuously as site data, phenology, GDD timing, and cultivar performance are verified from extension research and field observation.
Written by Chris Welch, ISA Certified Arborist and Tree Risk Assessment Qualified. Every recommendation on this site comes from someone who works with these plants in this climate, not a content team repackaging national data.
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