PH levels for Autoflowers

Hi, what PH levels do you have. I’m growing Blueberry Autoflowers in a CoCo Perlite mixed medium. I’m guessing about 6.5.
Thanks

This is a good article about PH and PPM.

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Thanks, that was very helpful. I’m also wondering about Humidity levels, do you have any ideas ?

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My tent typically stays between 45-60%.

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Do u need to artificially adjust the humidity. The humidity levels where I am are generally low. Any ideas how I can add humidity

You can buy a humidifier for fairly cheap.

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I would use an ultrasonic humidifier. I grew blueberry autos in soil and registered user has got you covered on the humidity level. The only thing I would add to that is I dropped my humidity down to 40% when she was flowering. If you got your seeds here, Robert has a great grow bible you can download. I think he also has a harvest guide too. Good luck on your grow! If you get a chance, post some pictures, we’d love to see how she looks.

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pH is determined by the grow medium you use. The medium sets the pH requirement for nutrient uptake. Coco is 5.5-6.5 and I shoot for 6.
Soil is slightly higher and hydro is a little lower.

RH is determined using the VPD chart. The rh you want is set by the temp and what stage of growth your in.

These are the two biggest factors in growing. All the light and badass nutes in the world won’t be worth a damn if your pH and RH aren’t close to were they need to be.

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From what I’ve read a lot in here. The best ph for autos are at 6.3 but 6.5 is okay. Wanna just keep it between 6 and 6.5 really and you should be fine.

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That’s for soil. Being an autoflower or a photo doesn’t dictate the pH. As mentioned above that is up to the medium and he is using coco perlite mix.
Soil 6.0-7.0 with 6.5 being ideal
Hydro (incl coco) 5.5-6.5 with 5.8 being ideal

image

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@RandomlyRan sorry, forgot to mention for soil. I dont know about hydro at all. Although I’ve heard mixing FFOF and some coco+perlite you’d wanna have it at 6.3 which is a mix of the coco and soil. But I’ve tried to ask if I should mix the coco and perlite with some ffof and nobody has really said if I should and why if so. Maybe you could help with that?

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If I was going to mix coco and soil it’d be between 6.0-6.5 so 6.2-6.3 would be fine (which I wouldn’t mix them btw, personally, the appeal of coco is it’s inert so I know exactly what’s available to my plants. The only benefit for adding it to soil would be drainage and I’d use perlite for that)

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Yea. I figured perlite would be enough. I didn’t get why add both if you just were using for drainage… I mean, you could just use more perlite, right?

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Yep. I’m a fan of more perlite in coco myself. The appeal of coco is you can feed more often and with extra perlite you can feed everyday. The more it drains and dries, the faster I can give it more Jack’s.

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@Nugnug,
@RandomlyRan is giving you good information. pH is determined by the medium you are growing in. If your pH is off then your plant won’t be able to take in the nutrients it needs. My last grow was blueberry auto but it was in soil. I do not have experience growing in coco & perlite. My blueberry seemed happy at around 50% during the veg stage. I had it a little higher during seedling stage as the roots were forming. @RandomlyRan is correct in telling you ph and humidity are very important in growing. But all of the factors have to be at the right levels to maximize your grow. pH, humidity, lighting, your medium, and the nutrients. If you dont have them already, get a good pH meter and a tds meter. They are “you gotta have these” for growing. Good luck! This is a great group of people who are here to help. There are no stupid questions.

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Thanks everyone, yep this group is great.
I’m also gonna have to add a heater and a thermostat controller as the nights get down to about 5 Celsius here. I’ve built a room in my shed.


I haven’t added my water rings yet.

Yep, I’ve got a PPM meter & a Ph meter.

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The Humidifier’s I’ve seen only have 2 or 3 settings. How do I get it to sit on 60% or 40% for example.

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Inkbird and similar companies make temp and humidity controllers.

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Yes, I’m thinking of getting the inkbird, $47 Aussie. Do I also need a dehumidifier ?
Or can I use one of the outlets on the inkbird as a temperature controller ?