That means that an 8-9 week strain should be done in about 75 days if all the conditions are correct?

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I wish I could grow, but I respect the law of my authority figures.

a 8-9 week strain would prolly be done in 10-12 weeks

if you don't allow the plant to have some veg time. you will have a bad root base. when you put the plant into flower the root growth slows to just about zero.

by 8-9wks you mean flowering time??
i grow 12/12 from seed alla time, and a reg 8-9wks 'flowering' strain STILL needs to reach maturity before it will start flowering.
Once the sprouts show thir heads I tend to get a short veg period of 3-6wks dependant on strain n pheno and vigor.
once they reach the 6th or so node i will get preflowers, and a wk or so later they will start real flower production.
so in theory you might be lookin at 11-15 wks from germination to harvest

just my .2

pce
Frosty

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stumps is right, not allowing the roots to take before flowering will leave a small weak plant with little to no yield. Wait at least 3 sequential nodes, 5 is the best to keep them small and still yield

The plants will veg and a decent rootball will be achieved under 12/12..
Under 12/12 schedule The plant will naturally grow in a VEG state til it reaches maturity and is ready to flower, and this can take anywhere from 3-6wks, or usually around the 6-7th node preflowers will show.
The only drawback of 12/12 is that your plant would not be quite so nice as those that had a veg period of 18/6..
As for 12/12 giving poor yield...would you call 3.5 oz from 1 un-topped plant under a meager 150w hps poor yield?

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just asking.. if you use 12/12 during veg dosen't that just slow groth during veg??

lol I type slow.

I need to back up. my 12/12 grow was from a clone. using a bubbler. the clone rooted and produced a bud. It finished about two weeks later then the mother.

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I like growing 12/12 from seed but only bagseed don't waste a good strain on it. I've had decent results everytime usually fill any extra space with bagseed in solo cups the veg about 3 to 4 weeks and then start to flower at about a foot tall for me in solo cups they end up at about 20 to 30 inch 10 to 25 grams its fun and somtime killer bagseed smoke i usually try to get almost all amber trichs stoned to the stone