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There are several brands offering good crtified organic nutrients. I've had good experience with BioBizz and General Hydroponics' General Organics range. I use liquid bat guano, algae, humic acid, worm castings and other goodies from such brands. Even the algae doesn't small that bad, and the...

Thanks for the tip! Had no idea about that shop (I'm on the French-speaking side of CH). Will give them a call tomorrow morning :)

The setup looks ok, but for two to three plants, you should definitely use a 150w HPS lamp at least. That setup is more suited for mother plants where you went to keep them in a vegetative state without necessarily ever flowering them, so lighting is not as vital.

I'm just gonna go for the complete set. Less headache and temps shouldn't be a problem (getting a variable speed exhaust fan just in case). Apparently they still don't have plasma nor CMH here in Switzerland :-?

Looks like a lil' too much nitrogen and not enough phosphorus. On my grows, I use a pH of 6.2 at this stage of flowering.

What solution pH are you feeding them?

It won't screw up by switching. Plants need the dark time. Photosynthesis AND Respiration...

Using distilled water is probably the cause. I know that tap water can bee too "hard" in some areas, but at least do a 50/50 distilled and tap water mix. Let the tap water sit out overnight so (some) chlorine can evaporate. Tap water contains a lot of minerals, including calcium.

Day 28 of 12/12 The canopy is definitely filling out. Thanks to the Swiss wintertime, I can keep the light pretty close to the top of the canopy. Temps are around 25C, humidity slightly low at 35%. The problem with a multi-strain grow is the different plant height of different...

The absence of light will kill it. You can cover the top of the pots with black plastic (like from a trash bag) with little holes to allow some aeration of the soil, while still depriving the algae of light.

The problem with lemon juice is that the citric acid breaks down in the soil, and thus the pH lowering effect doesn't last.

Pure Sativas can flower for 16 weeks and more. Also, flowering starts when you see the first signs of flowering, not when you flip the lights to 12/12. Are some parts of the plant closer to being done than others?

Yes, it is.

If I understand correctly, you're moving them outdoors to indoors with limited light and no feeding? The dark will not kill them, but will really slow down any growth, though it could stress them to finish quicker maybe? I'd be more worried about going 10 days with no water. Doubt they can...

Love the spectrum those CMH put out. Kudos!

1- Removing lower third of foliage 2- Mycorrhizae fungi 3- fewer, larger plants in larger pots (works for my setup. Your mileage may vary).

From my current grow: And my favorite part, the Dyson bladeless oscillating fans :D

DO NOT add dolomite lime. It will reduce acidity, i.e. increase pH. Flushing your soil with the correct pH solution should correct this.

Depends on the pH. My tap water is around 7.6, and I use about two teaspons to a tablespoon, depending on whether I'm adding nutes or not. Just use the pH tester and gradually add.

7.1 is way too high in my opinion. Epsom salt will only make it worse as it is quite alkaline. To me it looks like certain nutrients are being locked out due to the high pH.