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That will explain the slower growth. Your roots will be developing more slowly. Not as much oxygen as they would like. Heavier soil to tap through. I had similar symptoms, same reason. They should do fine once the roots get a decent hold. Keep doing that. Less is more for now, since the dense...

@Canna2022 I need something. What would you recommend? ;)

As hydrogen peroxide does its job, it uses up its active potential, and neutralizes. It is not 'poison' ... and will not cause soil problems. Just don't go overboard and use too much at once. Spray the outside with a mister. Try one go at it, wait a day, go again.

True for water, evaporating on the way up. Solids get left behind. But water spends time in the air in clouds, and rain travels down through the air. There are loads of air borne particles, and those get trapped in the droplets. https://en.m.wikipedia.org/wiki/Mineral_dust - - - Actual...

Nope ... it goes curved, not flat. That's just an approximation on small scales. The ocean is water in a giant container. The water surface is rounded like the earth. A plane is on air. A ship is on water.

From what I am reading, it seems like people filter rainwater more for 'crap in the collection systems than the rain water itself. Dirty pipes and tanks.

Major Plant Nutrients in Rainwater Research by Allen, Carlisle, White and Evans, at the UK’s Nature Conservancy, measured the total quantity of major plant nutrients in collected rainwater over a three-year period at five sites in Britain. The following figures are reported N (nitrogen)...

https://www.theguardian.com/commentisfree/2019/apr/05/why-people-believe-the-earth-is-flat-and-we-should-listen-to-anti-vaxxers Why people believe the Earth is flat and we should listen to anti-vaxxers There are existential, epistemic and social reasons that appear to drive people to...

Answer the basic questions, and we can try to help. Yes, it looks like mould or fungus. White as you said. But is it the white mycelium of whatever you are trying to culture, or is it just random white mould or fungus. Assuming that you're trying to culture psilocybin ... then it should look...

/s in case you hadn't realised

But don't listen to the facts. Facts are fake news in this thread. Bloody academics and scientists ... m'eh.

Great illustration! And to add to this, each repotting is usually into a 'stronger' or richer soil. 1. Germination to seedling cups Here you want a soil that drains well, and isn't nutrient heavy or even vaguely hot. - young seedling roots are more sensitive - if you make the roots search out...

That's from a human article. Your plants need many of those too. And there's the iron that was pointed out by @buckaclark in one of the first responses.

I'm not familiar with any of the commercial products - I forage for fresh kelp myself. Here's a recent thread with some opinions. https://rollitup.org/t/gs-plants-fish-kelp-liquid-fert.1079767/ You won't need a lot ... it's one teaspoon to a gallon of water type of dilution ratios. You'll...

No, I got that. I'm saying that tap water is better. Ignore chlorination stories, especially for your first grow. Unless your local water supply is really f-cked up pH wise, use that ... it has trace elements and minerals that your plants need. Those might be in small quantities, but they are...

The ill effects of chlorination in the water have been overplayed. It won't hurt your plant at all, and cannabis needs a little chlorine to be healthy. The only downside is that the chlorine can (marginally) reduce your microbe population, but it's not that big a deal. Let the tap water sit...

Anyone feel free to shoot me down if I'm wrong, but if your water doesn't have trace elements, then isn't a 'sea based' feed a good source to get those? Maybe try a little fish hydrolysate or kelp. Broad range of trace elements and micronutrients in those, and couldn't do any harm I reckon.

@farmerfischer No need to apologise to this "user". He's working the community forums for free advertising, and professing innocence, and playing the victim card. He knows exactly what he is doing.

It looks like some kind of mould or fungus. Give us some more info to go on. - what are you doing - what's in the jar - what are you trying to achieve

A vinegar trap helped me out when those buggers were attacking my psilocybin grow. I used apple cider vinegar and fresh orange juice. Obviously, try to deal with the root cause, but this works well to catch and kill the flying adults.