Author Topic: PRO-MIX® Compressed Premium Moisture Potting Mix  (Read 1153 times)


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PRO-MIX® Compressed Premium Moisture Potting Mix
« on: October 03, 2022, 06:38:54 pm »
Has anyone used this Pro-Mix product in their Earthbox? Looks like they just compress 2 cf of Pro-Mix into A 1 CF package, local Menards has it on sale 1/3 off.

Sphagnum peat moss (80-90% by volume)
Ground Limestone (for pH adjustment)
Wetting agent


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  • NE Texas Zone 8a
Re: PRO-MIX® Compressed Premium Moisture Potting Mix
« Reply #1 on: October 03, 2022, 08:39:07 pm »
In my locality, I can't find anything that doesn't have all the things we're not supposed to have in the mix, so I make my own with (roughly) 80% Canadian peat, 10% perlite and 10% vermiculite.   Kind of backbreaking for me, but it seems to be working well enough so far.

Sounds like you got a bargain, hope it works well for you.


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Re: PRO-MIX® Compressed Premium Moisture Potting Mix
« Reply #2 on: October 08, 2022, 08:14:53 am »
Professional growing mixes are available at all independent garden centers across the country. These will be sphagnum peat or coir based and will work great in our EarthBoxes.
Why Google, when you have me?


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Re: PRO-MIX® Compressed Premium Moisture Potting Mix
« Reply #3 on: January 28, 2023, 10:46:25 am »
A few years ago I compared Pro-mix's compressed premium moisture potting mix to Miracle-Gro potting mix and the cheapest potting mix I could find. I also did a box mixing all 3.

All performed well, but not as well as when I used Earthbox's growing media. (which I foolishly dumped into a raised bed, not realizing how impossible it would be to find one of the recommended replacements in my area)

Pro-mix and miracle-gro were very close in performance. I liked that pro-mix didn't have a strong odor and didn't have as many big chunks (wood/bark?) once I broke it up. The downside was that being so well compressed, it was hard to break apart and make fluffy with my arthritis.

The cheapest potting mix had a very strong odor, more big chunks, and didn't perform quite as well as the others. (It performed WAY better than my raised beds, just not quite as good as the other two.)

I got a couple of new Earthboxes this year and will probably need new growing media in 2 of my old boxes. A family member gifted me their unused garden stuff, so I think this year I will compare Miracle Gro Performance Organics to mixing my own.