when should I start Vegging?

I have seen so many different options for vegging... how tall should they be..? Got them as clones not sure how old they are individually..? have had them for a week and are about a foot tall...
 
20 inches i am going by... and when they have some lateral stem growth... not just those big fan leaves the ones that go diangonal to those
 
If you got clones, and they are rooting well, set them on 20/4 for 4 weeks, or whatever you decide for your grow. Usually it takes on avarage for clones to take root 2 to 3 weeks, plus or minus depending on when they were cut, and what cycle the mother was in etc.
 
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