In my opinion it doesn't matter as much when you start them, what matters is getting them under increasing daylight hours before they preflower. Ideally a week or two before they preflower at least. And making sure you line up the photo. Ahead of time to the photo on the day that you want to plant. Even if it's not quite there yet outside
Then just like my plants they can mature and preflower in mid May to the end of May without revegging
Honestly and truly if the plant has no autoflower characteristics and it is exposed to increasing daylight hours consistently for a time period before it pre-flowers it's not going to try and flower and revegg. I've never once seen that happen personally.
This is another example of reasons plants can go into flower early without revenging when they never revegged in spring
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This is also the reason that I am calling those two sativas but not that small mexi red Afghani plant fast flowering. That mexi read plant was just timed perfectly with the solstice by chance.
Another commonly misunderstood genetic thing, is that that crossing and inbreeding to stabilize the lineage is something that is done to make breeding with a lineage more predictable.
When it comes to plants if you want access to an unlimited amount of the same phenotype of a given plant expressing the same you make self-pollinated S1's lol.
Cannabis is honestly like the only genetics field we're back crossing an inbreeding became the norm as far as moving forward with lineages goes. And that's just because breeders misunderstand the purpose of that crossing and stabilizing a phenotype.
If you breed with an S1 of a particular phenotype you'll have much more unpredictable phenotype variance as a result. You don't have that breeding unpredictability with stabilized phenotypes like you do with s1s. But you also cannot translate vigor and rapid environment response in most cases either.
