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pro mix hp cannabis seeds

Losing the battle with first grow in promix HP, help!

Nightmare first grow with Promix HP. Battles with low PH, nutrient toxicity/deficiency/lockout, overwatering.. you name it. Plants are now 7 weeks old from seed. Just transplanted 6 days ago into 3gal pots of promix from 1gal where they were root bound, droopy, and off colour (pale). On recommendation did a mild epsom salt type flush in the 1gal pots about 5 days before transplant and let dry out before transplanting. Ran PH 7.0 water with a small amount of cal mag through the new pots about 3 times with 10%-20% runoff still only managed to get PH up to about 5.4-5.5 with ppm’s running very high at 1600-1800.

I desperately want to run a shit ton of water through to flush them completely and start over but afraid of drowning the poor girls as they have a history of overwatering. Any help including drastic measures to save/get these back on track is appreciated.

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a mongo frog
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hotrodharley
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Bernie420
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Nightmare first grow with Promix HP. Battles with low PH, nutrient toxicity/deficiency/lockout, overwatering.. you name it. Plants are now 7 weeks old from seed. Just transplanted 6 days ago into 3gal pots of promix from 1gal where they were root bound, droopy, and off colour (pale). On recommendation did a mild epsom salt type flush in the 1gal pots about 5 days before transplant and let dry out before transplanting. Ran PH 7.0 water with a small amount of cal mag through the new pots about 3 times with 10%-20% runoff still only managed to get PH up to about 5.4-5.5 with ppm’s running very high at 1600-1800.

I desperately want to run a shit ton of water through to flush them completely and start over but afraid of drowning the poor girls as they have a history of overwatering. Any help including drastic measures to save/get these back on track is appreciated.

watering is a skill you dont want it to get too dry yet you dont want it to be constantly drowning the roots either. Of course when you water it it is very wet the trick is to know when to water again.

I would flush pots with phed to 6.5 of clean water to runoff a lot of run off. you have small pots so this isnt going to be very hard. Then I would renute at half strength which will be a little run off as well phed to 6.5. Add in about 10ml of cal mag per gal. A little kelp never hurt anything .And get some MICROBES dont do shit till you get some microbes. You flushed out all your microbes because with that soil you hardly had any to begin with.

Plants look N K and mag deficient right off the bat to me.

do this then leave it alone till you have to water again then do it at 3/4 strength as they should be back on track and healthier.

STOP checking ph run off is dumb as fuck and tells you dick. and ppm run off is silly unless you just want to know for fun. Microbes regulate all that shit for you.

No mention of environment or lights.

when you talk of the plants being root bound I doubt that they were, inherently acidic ok you know this how or what does that mean you dont know I dont know lets just make shit up and go with it.
Let the promix dry until the pots are really light (apparently not lite enough) It was dry enough, if you say really light in a solo cup it was dry enough. Probably too dry and you stressed the plant out.

Dont ever stress the plant is the number one thing to be a great grower.

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Pro mix HP = soilless

  • Thread starter beenjammin
  • Start date Jan 12, 2013
beenjammin
Auto Warrior
Muddy
Proud deplorable!

Pro Mix is all I use for all my growing. According to the manufacturer, Premier Horticulture, Pro Mix is considered semi soil less. Not a true soil less medium like coco, but not a soil medium either. In my experience, plants grown in Pro Mix do best with a pH of around 6.2 – 6.3. I’ve tried running as low as 5.8 but got better results with the slightly higher pH. Since Pro Mix only contains starter nutes, it’s up to you to supply all the nutrients for the plants. I generally find that the starter nutes are exhausted within the first two weeks, so usually start mild, 1/4 strength feedings around day 12 – 15. I’ve got some seedlings right now that just popped and I’m planning on giving them nutes even earlier this grow, on their first watering which is usually around day 6 or 7. I want to see what difference, if any it makes.

Plants grown in Pro Mix also tend to show a cal/mag deficiency around week 5-6, and a P deficiency in mid to late flowering. It’s not a bad idea to keep a bottle of cal/mag supplement and something like PK13.14 on hand should those deficiencies arise.

Also, since you are growing under HPS using air pots, I would suggest you switch from HP to BX. BX hold a bit more moisture than HP and seems to be better suited to the higher temps of HPS lighting. HP is best for LEDs, CFLs and T5s. I grow using LEDs for flowering but MH for veg. So I start my plants in BX, then use HP when I transplant.

Sometime in the near future I’m hoping to write a comprehensive tutorial on how to grow using Pro Mix. Stay tuned.

erock
Auto Warrior

Pro Mix is all I use for all my growing. According to the manufacturer, Premier Horticulture, Pro Mix is considered semi soil less. Not a true soil less medium like coco, but not a soil medium either. In my experience, plants grown in Pro Mix do best with a pH of around 6.2 – 6.3. I’ve tried running as low as 5.8 but got better results with the slightly higher pH. Since Pro Mix only contains starter nutes, it’s up to you to supply all the nutrients for the plants. I generally find that the starter nutes are exhausted within the first two weeks, so usually start mild, 1/4 strength feedings around day 12 – 15. I’ve got some seedlings right now that just popped and I’m planning on giving them nutes even earlier this grow, on their first watering which is usually around day 6 or 7. I want to see what difference, if any it makes.

Plants grown in Pro Mix also tend to show a cal/mag deficiency around week 5-6, and a P deficiency in mid to late flowering. It’s not a bad idea to keep a bottle of cal/mag supplement and something like PK13.14 on hand should those deficiencies arise.

Also, since you are growing under HPS using air pots, I would suggest you switch from HP to BX. BX hold a bit more moisture than HP and seems to be better suited to the higher temps of HPS lighting. HP is best for LEDs, CFLs and T5s. I grow using LEDs for flowering but MH for veg. So I start my plants in BX, then use HP when I transplant.

Sometime in the near future I’m hoping to write a comprehensive tutorial on how to grow using Pro Mix. Stay tuned.

How to use ProMix HP

Hello Stevepmd, The easy way to understand your promix is that it is not soil as you think. It has no nutes, does not retain water like real soil. I would PH your water to 6.5 PH and flush till 6.5PH comes out.
Then water/feed with your nutes and cal-mag. PH water after all nutes added to 6.5PH and continue that based on what I have researched. So many questions about its use but very few answers. I’ve herd it used here on the forum and sure someone will jump on board to help from experience. That’s a start in a good direction . Good Growing !!