I don't know about dr greenthumbs g13, I just saw "g13".
g13 is a well known strain that's been around a long time and always yielded huge amounts. Doubled's grows used it one or two years ago yielding more than nearly anything in history at that time, now I realize there are alaways a few new ones and have been since then, but I don't put much stock in the idea you must have the latest and greatest $100 a bean thing that's only been out such a limited time it can barely be past f1 or f2 stable.
It takes years to make a stable and consitant new strain, and g13 the original wasn't lacking. If you think you want this new strain fine, pay for it and see how it goes and report back, otherwise get the tried and true g13 of old which is stable and consistant and a huge yielder.
The g13 I grew was the g13 of old from medical clones in my area about 1-2 years ago.
Vapekush what seed sellers say about yield is useless, doesn't matter wet or dry it's bullshit. Go off what the best growers are using and what results you can see in pictures and their text based on their type of grow and food and lights.
Follow this doubled's picture to it's source, this is the original g13 at only 6 weeks into flower. If that's not good enough, I don't know what is.
Source:
http://www.thcfarmer.com/forums/f131/
This seems to confirm my opinion:
https://www.rollitup.org/seed-strain-reviews/416006-lmfao-g13-greedthumb-isnt-even-32.html
It does look much smaller in comparison, but I didn't look into the details to see how it was grown, if they used anything like dd's lighting which was vertical 1k's in a checkerboard pattern just like krusty buckets used, but dd would not show a bud next to a tiny lighter as his best example.
Looks good, but this is not anything equal to what dd got:
.