What's the max latitude for growing outside, I'm slightly farther North 59/60 degrees?
A lot depends on how long in the season you can go before you start getting frost/snow. If you have a greenhouse you can extend the season up to a month on either end but the days will be a lot shorter at both ends too. If you started plants say in March under 18/6 light then put them in the greenhouse in may they are going to go into flower right away then as the days get longer they will want to go back to veg then start flowering again once the days begin to shorten. In the spring you can prevent them going into flower with a few light bulbs on a timer to kick in during their night for an hour or so as it tricks them into thinking it's a longer day. (like plants can think eh.
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That's for photo period plants where good autos should just flower when they are ready even in shorter days and continue flowering as the days get longer. Their flowering is on a time schedule and not a light schedule and continue growing in size as they flower unlike photos that basically stop upward growth once they are done their stretch. My autos are well into beginning to flower but still growing upwards at an inch or more per day but is that stretching or just their normal growing. I'm not certain but my tallest one grew an inch since yesterday and it's been overcast and quite smoky here for the last 3 or 4 days. All those fires in BC are smogging us out here in Alberta.
I'd get yourself some good auto fem seeds and give it a go next year. Our power prices are going up another 25 - 28% from what I just heard on the radio. Their reason is that with all the demands on the grid from air con etc they have to raise prices. WTF! Tehy are selling max power for max profits and that somehow justifies raising prices? With everything else the more they sell prices usually come down but we, thanks to our current provincial dictator removing rate caps, are getting screwed in the ass hard and without lube!!! My last bill was 26.5¢/kwh and almost $500. I don't even get a senior's discount.
If I get enough pot off my outdoor crops I don't need to grow so much inside and can just do some seed breeding all winter and use a lot less power.
I'd sure give it a try.