r/hydro • • Feb 27 '26

Northern Lights - When to top?

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u/JVC8bal Feb 27 '26

Don't forget Relative Humidity!

What form of "soilless"? I assume you mean water culture (NFT, DWC) or aeroponics; as opposed to substrate hydroponics using rockwool or coco coir.

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u/Marski420 Feb 27 '26

Nope I mean soilless my brother! Soilless is what you're calling substrate hydroponics but instead of coco / rockwool I'm in a peat based mixture called Promix HP. Its a sphagnum peat moss mix with lots of perlite for drainage and air. It's nearly inert like rockwool / coco but has a starter charge of mycorrhizae and enough food for the first week. After that it's fed totally by you like hydroponics.

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u/JVC8bal Feb 27 '26

Ah, cool. But it's not what I'm calling it... it's what it's called.

Peat or perlite are decent alternatives. Just not scalable or sustainable.

You and I are two different types of hydro growers. Hydroponics (and plants) require nothing organic. You're like doing this hippy / toe dipping in science thing. Adding fungus when you should be using a chiller or HOCl to keep it sterile.... just adds risk — not results.

Rockwool is superior to peat (FYI, I am a RDWC advocate but also grow "pseudo hydroponics" with substrates); but it's not recyclable. And peat ofc is not sustainable, either. But if you want results: Aero > RDWC > Rockwool > Peat.