Selecting Early Finishing Phenos
Selecting for early finishing plants within a sativa pack is a slow but effective way to make a line workable at a northern latitude. Each generation, the plant that ripens first is kept for seed, and over three or four rounds a sixteen week line can be brought down by several weeks without crossing in indica genetics. The acclimatisation project on https://hazesativaseeds.com documents a Colombian line being adapted to a Dutch outdoor season this way over several years. The trade off is a narrower gene pool, so keeping some of the original seed in storage is sensible.
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