Above the sixtieth parallel autoflower seeds are pretty much the only realistic outdoor option, since photoperiods never get their twelve hours of dark before the frost. The near constant daylight in June pushes autos hard, and I have seen plants in Scandinavia outgrow their southern cousins by midsummer. Start dates, expected finish windows, and which strains handle cool wet Augusts without rotting are laid out by latitude band at https://turboautoflowerseeds.com for northern growers. The trick is starting indoors in May and moving them out hardened off.
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