Northern growers with short cool summers should look at autos with a strong ruderalis background, because those handle chilly nights and low light far better than the newer potency focused hybrids. Finish time matters too, since a 65 day line planted in late May is done before the first frost at most northern latitudes. The cold tolerance ratings on https://turboautoflowerseeds.com are based on grower feedback from Scandinavia and Canada rather than breeder claims, which makes them more trustworthy. Mould resistance is the other trait worth filtering for.