Previous grow Promix HP
- Thread starter DaveL
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PE636
Well-Known Member
You just adding it to more new HP?
BigD13
Well-Known Member
I've never used ProMix HP, but according to their website it's mostly peat moss and perlite. So shouldn't it be treated as soilless? If so, you should be able to reuse it, but your going to have to feed and water every day.
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- #5
Yes. Just supplementing my new stuff.
The plants have all been indoor grown. No mites or pests of any kind.
Johnny5thesim
Well-Known Member
I’m a promix HP user. I would not reuse it. It has buffers to keep the PH from diving. As peat is naturally quite acidic. I find it slowly gets out of whack over time. Also, if you use chemical nutrients, I’d be concerned of left over salts. Or having to flush them clean, stripping the medium of its buffers.
I’d much rather spend the small amount personally, to avoid taking chances with issues. Just my two cents!
I’d much rather spend the small amount personally, to avoid taking chances with issues. Just my two cents!
Johnny5thesim
Well-Known Member
Johnny5thesim
Well-Known Member
I ducked out and grabbed some fresh stuff just as all this virus stuff hit. Some retailers will allow a curb side pickup possibly? Or a small grow shop can hook you up?
No, Promix HP is used like soil. I also use Promix. Almost ready to start another journal, not sure where you are located but I just checked Canadian tire. They have bales and do curbside.
Johnny5thesim
Well-Known Member
Promix is used like a soil. But is considered a soilless medium. As Canadian promix HP has zero nutrients. Aside from the amendments it uses to buffer PH, it’s an inert medium.
I was also told by premier horticulture, that the Canadian version of HP also has added mycorrhizae.
100% agreed. I was merely just stating for @BigD13 that it’s treated like soil. With that being said I do mix mine with, worm castings and organic soil. Are you saying the American version doesn’t have mycorrhizae? I didn’t know that. Good to know.
You can rinse it and add buffers. Quick lime for instance or dolomite.You will have to do slurry tests to make sure it ends up at the right pH.
Dolomite is more gentle but slower acting. You would have to have extra prep time prior to planting. The quick is much faster, as the name implies but doesn't stick around as long and can be more caustic if used incorrectly.
It is possible to do but may be more work than some are willing to put into it.
I am reusing mine outdoors with the quick lime option for my veggies. I will also add steer manure or some type of compost.
Dolomite is more gentle but slower acting. You would have to have extra prep time prior to planting. The quick is much faster, as the name implies but doesn't stick around as long and can be more caustic if used incorrectly.
It is possible to do but may be more work than some are willing to put into it.
I am reusing mine outdoors with the quick lime option for my veggies. I will also add steer manure or some type of compost.
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- #13
Johnny5thesim
Well-Known Member
Apparently there is differences. When I was originally vetting promix. I found American versions that had starter nutrients and had mycorrhizae added in special marked versions. I wanted an inert HP with added myco. So I called premier and they set me straight. Saying their Canadian version of HP by default, has mycorrhizae and no nutrients.
Hmmm, very interesting. Thanks @Johnny5thesim . TIL!
You can use a rinsing agent like yucca.
Oyster shell also works for a buffer. Slipped my mind earlier.
No idea why. Lol
