Bigger Yields By Adding More Food? Myth? Fact? :)

Advanced Techniques
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Very true. If you grow more plants - under the same exact watts - you will also have an inflated GPW.

Which just proves my point. :slight_smile: GPW is meaningless.

GPW is a useless metric. How much you yield has very little to do with watts.

Changing the watts in your grow might increase yield to a small degree, but adding plants, or vegging longer will blow it all out of proportion. To the degree that GPW is meaningless.

For example, lets say you have 300 watts of light and grew some Blue Dream from clones with zero veg time and yielded 500 grams dry after 10 weeks or 70 days total. Then you grew some C99 from seed and vegged it for 9 weeks, (huge trees now) then flower for 10 weeks and yielded over 1000 grams. Both grown in the same tent with the same lights and the same nutes, both in hydro.

The GPW on the first grow is 1.66 GPW = not bad but not great.

The GPW on the second grow is 6.6 grams per watt. Wow!! Woo hoo!! Dam Im good!

But wait, there’s more!

The first grow, with the crappy 1.6 GPW yielded 7.14 grams per DAY.

The second grow with the woohoo 6.6 GPW yielded 7.5 grams per day.

Wait what?

That huge woohoo GPW number means nothing. At the same time, a low GPW means nothing. Both grows above yielded essentially the same over time.

Another example - maybe your growing autos that have low yields on each grow, but are FAST. You can easily have more grams per day with a lower GPW - just add more plants like you said or veg longer. Or turn down the power some. Your yields wont drop that much, but you will be able to claim higher GPW.

Those are examples from my grows over the last year. I should also point out that you do NOT NEED large numbers of plants to get a huge GPW. That C99 grow of mine that yielded over 1000 grams was a single plant.

Grow one plant until its a tree and your GPW will look good - OR - grow several plants in SOG - OR grow a few and do SCROG.

Edit: Actually, the grow with the huge GPW was a single plant, under scrog, with a long veg cycle, so any combination of factors can blow GPW out of reality - because GPW is a useless metric :slight_smile:

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