When to switch to flowering, 70 days old critical mass cbd feminized, topped and lst used

Phone isn't loading pics but at 70 days you should be good. Keep in mind it will double size at least, when stretch hits

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One of my favourite strains.

This strain will not double in size, nowhere near it. Allow for 30-50% increase in size, the lower end if you keep your lights off temp within a few degrees of lights on temp for the first 3-4 weeks of flower.

No idea about when to put into flower, is that your entire active growing space in the picture, and does your light cover that sufficiently?

 

That plant is 10 weeks old? Oh my!