[TheReverend]

I've gotten some mild root rot I believe, so I let the girls dry out for a few days. Now I'm going to water them, but no nutes, just RO.

However, as I was doing some reading online, I came across this article on the Black Dog LED website about never watering with 0 ppm H2O. I don't see how it can possibly be true, as I have watered with just RO many times and never had any issues.

"It is important to know that using Reverse Osmosis, Distilled, or other "0 ppm" water by itself is bad for plants, as it leaches away essential ions. We recommend never watering with "pure" water without first adding a small amount of nutrient or additive to act as a "buffer", or it could kill your plants." *




Source
*https://www.blackdogled.com/blogprop...-nutrient-mix/

[Midnight Tokar]

I've watered with pretty much nothing but RO water for almost 10 years now because my tap water is so bad. I occasionally make a EWC tea with kelp and when necessary use Epsom salt for MG deficiencies.
I've seen that story about RO leeching minerals and essentials away from plants many many times. My question has always been: when growing in a container just exactly where are they leeching to. It's a captive environment and IF they leech from the plant they go to the "soil" and back into the plant. Also roots are pretty much a one way street going into the plant. I don't buy it and 10 years with very few problems don't support that theory.

[TheReverend]

Originally Posted by Midnight Tokar

I've watered with pretty much nothing but RO water for almost 10 years now because my tap water is so bad. I occasionally make a EWC tea with kelp and when necessary use Epsom salt for MG deficiencies.
I've seen that story about RO leeching minerals and essentials away from plants many many times. My question has always been: when growing in a container just exactly where are they leeching to. It's a captive environment and IF they leech from the plant they go to the "soil" and back into the plant. Also roots are pretty much a one way street going into the plant. I don't buy it and 10 years with very few problems don't support that theory.

Excellent response and exactly what my good friend with 10 years experience said as well. He has always flushed with just RO and never had any problems.

I would understand if this advice about 0 ppm was coming from a nute company, as they want you to add nutes every time... but it's a grow light company... and they are one of the absolute BEST in LEDs, so it comes as a surprise they'd be dispensing bad info.

Very interesting, but I think I'll side with you and my friend. Past practices prove that you can water with just RO and you'll be fine.

[Midnight Tokar]

BTW, I don't use R.O. for flush only as your friend does. I pretty much run "water only" soil grows and every single watering uses R.O. water.

[TheReverend]

Originally Posted by Midnight Tokar

BTW, I don't use R.O. for flush only as your friend does. I pretty much run "water only" soil grows and every single watering uses R.O. water.

Really? No nutes at all throughout any entire cycle? Just RO water and soil?

[THC123]

RO water is fine for plants. I grew 4000 gram trees in a greenhouse using only good soil and RO water, never any nutes. The plants where 4,5 X 4,5 meters wide and almost 5 metres high. So yeah RO water is fine for plants they love it!!

[TheReverend]

Originally Posted by THC123

RO water is fine for plants. I grew 4000 gram trees in a greenhouse using only good soil and RO water, never any nutes. The plants where 4,5 X 4,5 meters wide and almost 5 metres high. So yeah RO water is fine for plants they love it!!

No nutes... RO + soil and that's it?

Just curious, why not add nutes and try to get even more? I mean, 4k gram trees are obviously monsters, but nearly everyone uses (and sings the praises) of a good nute schedule.

I'm not doubting or criticizing you in any way, just asking the question.

[THC123]

For the best and smoothest taste. We could have gotten more using a nute schedule but I dont like the taste I get with additives. But lets not get into that discussion.

R.O. water won't harm plants, see for yourself:
https://www.icmag.com/ic/showthread.php?t=265290

[Easy7]

And what is rain? Other than pollution, it's distilled water.

I would not listen to black dog led all that much. All their flowers look cheap for such an expensive light.

Growing is so simple that the world made it complicated.

[Midnight Tokar]

Originally Posted by TheReverend

Really? No nutes at all throughout any entire cycle? Just RO water and soil?

That's pretty much it. I water with molasses water 3 times during the plants life and will if necessary make an EWC, Kelp tea as required.
I may also use Epsom salt with the RO as necessary if a slight MG deficiency shows, usually very early in the seedling to veg phase when my soil is spent soil from the last grow so as not to burn the young seedlings.
The reason to not add nutes is because they don't need it and anymore will burn the plant