Jimster said:

I use Promix and it doesn't need much other than some nutes. Nothing too strong and you should be fine. I like to keep mine watered since Promix won't drown the roots and usually water either daily or every other day once growing well. Promix is great but doesn't contain any nutrients other than some Ph buffers. I mix about 20% composted manure in mine to provide plenty of micronutrients.

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MIMedGrower said:

I learned recently that even though promix professional bales like HP and BX do contain a starter fertilizer charge like the canadian bales even though pro mix has taken it off the american labels. Mine was 1.2-1.4ec (600-700 ppm) poured through straight out of the bale.

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Jimster said:

Could the initial high PPMs be coming from the buffering compounds, especially in the beginning when things are looser in the medium and less likely to have dissipated into the mix? I thought that any added nutrients had to be listed in some form. I would imagine Promix and just about anything will have some nutritional value unless it is heavily processed, but I wasn't aware that Promix had anything added to it other than carbonates (I think). The Promix potting soil is a different beast and comes chock full o goodies, but I don't think that is what we are talking about. I'm easily confused!

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MIMedGrower said:

The rep said it is not on the label because of different states and their different fertilizer labeling laws. But it is exactly the same pro mix hp etc. as sold in canada and labeled with the fertilizer starter charge.

When i bought it almost 6 years ago it said on the bale “starter fertilizer charge”. Or something close to that.

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