I was gonna say Ak47 too...but id get the real deal from Serious no f2 stuff....
the new afghan x haze by mr nice would probably fit the bill nicely as well....
there are plenty of good yielders out there, what do you like to smoke?
mr nice seeds or dj short would sort you out im sure.....i would look for f1s with dissimilar parents ...seems like the big yielders come out in those types of crosses ....the ones where is a heavy indy dom crossed to a heavy sat dom....shiva skunk yields as does, many others....but ak would be my first choice if potency and yield were the issue for a commercial grow....for headstash i dont care abouot yield just quality of smoke
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I gots 3 letters for ya L U and I. Nicely potent and some phenos really pack on the weight. And I didn't hear that somewhere or have a friend that grew it HeHeHe. IMHO the best yielder and hitter will be the strain you dial in the best for your environment and tastes. What do you like that you have tried so far?
As said, there's more than one strain... and everybody's looking for a high yielding potent plant.
Most Skunks and Skunk hybrids are good yielders, anything in that category would probably satisfy you.
Chronic is apparently concidered average potent by some, but the Chronic pheno I worked with was definitely top notch.
AK-47 has an edge on Chronic though and is a good yielder, a good compromise between the two. I'm very fond of AK-47, both for growing and smoking reasons. It hits hard and straight away, but the high doesn't last very long.
Power Plant (Dutch Passion) is a great yielder without Skunk influence, it's an African Sativa with an energetic high, it was a cash cropper favorite in Amsterdam for years because of its outstanding yields.
If we're talking Breeder Steve genetics, I would recommend Blockhead rather than LUI. Blockhead is one of the strongest knock-out highs I've come across, and it yields admirably. You really have to watch out for mold if you're growing single cola style, they pack on a lot of weight.
Some growers seem to concider Rezdog's Sour Diesel as an average yielder. I cannot comment on the IBL, but in the earlier versions there are some high yielding phenos to be found. I have a freak pheno of the Sour Diesel V3 that yields double to any of the other phenos, it's right below Big Bud in rank and without loss in potency.
And of course, White Widow and some of her varieties (Original Misty) never lets you down in yield.
I would have to agree with Serious AK-47. Was always a great yielding, great high-potency strain. And SourD is definitely in the healthy yielding category. Find a heavy yielding pheno of SourD and you are set.