That advice will work fine for seedlings, but not for many clone varieties. The older the clone strain, the easier they tend to flower. Lastly genetics, specifically latitude of origin will determine if they will flower under less hours of natural light.
I suggest and have been advised by experienced North Cali growers to wait until June to plant outdoors. Many wait until just before the equinox to be sure that nighttime flood lamps won’t be necessary to prevent early flowering…:-)
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