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**Winter wheat phenology (SEP → AUG).** Sow/emergence in fall → tillering → dormancy through winter (~108 days, often under snow) → growth resumes/jointing → boot → heading → dough stages → harvest in early summer. - **Max vegetation signal:** heading through mature (APR–JUN) — that's when NDVI peaks. - **Best imaging windows:** greening-up (to separate wheat from other species) and peak cover (for biomass).

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