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The terpene chemistry of a strain often predicts how gracefully it ages under cold — myrcene-heavy cultivars tend to accumulate faster at lower temperatures. Aggregated outdoor grower reports across 47 strains at three Canadian latitudes consistently flag these 10 as finishing with intact trichomes, measurable terpene loads, and zero botrytis before the first frost hits.

Five of seven strains in a 46°N test run finished before October 1st. The two that didn't — standard photoperiods — were dead by September 23rd. Here's what the numbers say about growing in Quebec's climate.