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In Bred Line.
Basically, a close group of growers in a certain area passes the same bunch of seeds around for long enough that the strain drifts into something stable and perfectly adapted to the local climate.
The method behind this is what the outdoor growers I know do each year: They plant one seed patch among the group of growers and select only the hardiest, most vigorous male every year to pollinate the patch. All other males are killed, leaving one sexy male and all the females. Then, at harvest time, they find the most spectacular female from that patch based on whatever the priority is- yield, vigor, flavor, mold resistance, etc- and save only the seeds from that one desirable female. These are saved for planting the next spring, and the cycle repeats.
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