Earliest

I would say the absolute earliest you could flower is when you see roots. Thats what you asked for. Atleast 10" or so would be better.
 
I have 5 nodes on the smalles plants and 7 nodes on the widow they are only 7 inches high but have pleanty of roots showing from the underneath of the rockwool cubes.
 
i flowered mine with those numbers, except i had one that was 12 inches (you can tell which one in the pic) and heres how they look day 26.
 
Its just that I have one plant flowering now that is 5 foot tall, I waited too long to flower, I want to get it much earlier this time to keep them to about 3 foot really
 
I know the rule of thumb is they will double to triple, so many flower at 18inches to be safe? but you could still end up with a 5 footer i would imagine. I think mine will end up right around 3 foot
 
Its just that I have one plant flowering now that is 5 foot tall, I waited too long to flower, I want to get it much earlier this time to keep them to about 3 foot really

A reasonable rule of thumb is to start flowering when the plant reaches about 12 inches in height, as in flowering it will triple in height to about 3 feet, but this all depends on what strain you're growing and whether it's indica or sativa dominant. Indica dominants grow short and bushy and Sativa dominants thinner and taller.
 
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