I waited on posting because there are so many variables.

IF you are talking using soil, from clones, that have rooted and have had at least a week in a 4 inch pot with humidity and another week to harden off, I say as early as 2 weeks after showing roots from the clone.

The plant will be short, but in some instances this is good.

Once the mother is old enough, it has no effect on the quality. Mothers just only get so good and that is it....so it seems to me.

Conversely, if you let grow up to 6 weeks and get just to your finishing pot, they can be 2+ feet tall unless you top.

Amount of light, space, air, species, etc, all that stuff makes a big difference.