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I think that ~300 is probably OK for the size of those plants, but technically 7.0pH isn't where you want to be in ProMix. I'm in the 5.8-6.2pH range. I filter my water down to 0EC/PPM and then add nutrients back in. I had troubles because our water source is 240-340ppm seasonally.

Let's step into the wayback machine for a valuable lesson...

Rather than using rando spoon measures, it's worth getting some more precise measuring implements. For liquids I use syringes...I keep 1ml and 10ml syringes with each bottle of liquid nutrient. If it's solids I measure in grams on a digital scale. And then I feed based upon EC or PPM. For...

Generally they yellow and fall off within a couple weeks no matter what. Focus on true leaves.

People keep using the term 'cotyledons' improperly.Cotyledons are the two little round initial leaves that the seeds put out until they grow the next set of leaves. They're only there to get enough light to kick-start the growing process.

14 days in ProMix w/o nutrient support is about as long as you're going to be able to go without feeding.

See...that's a reasonable 'sample size.' ;)

No on the samples. Because generally you're not getting enough to do a whole grow, and either having to switch what you're doing part way through or go out and buy a full regimen of whatever you've sampled, etc. is just a pain. If you do 'sample' then run out hitting your plants with something...

There's a bunch of info on Grove Bags around here if you do a quick search. A bunch of us are using them. You still have to dry appropriately but beyond that, I find them way easier & more convenient than jars.

This is the one I use in my tent: https://smile.amazon.com/gp/product/B08CXMV51C I have it on an inkbird, but probably will change to a AC-Infinity controller plug. The trick is something that's not huge but doesn't have a 'electronic' on switch...needs to be a 'hard' switch or a controller...

...You should pay attention to what Harley is saying: It may not be that you're not providing enough potassium, it may be in your feed, but there's a good chance that you've locked out it's uptake with serving up too much nitrogen, which blocks the plant from accessing the potassium. My move...

I filter my water. Our hardness resides between 240-340 seasonally, and it was just causing feed problems. I don't have a RO system, because of the amount of waste water they produce, so I use a ZeroWater pitcher and all my water goes through it and down to 0ppm for my plants. I change the...

No. If you do, you'll be surprised at how quickly they over-dry.

I'm a ProMix HP supporter too. Less guess work, figuring out when soil has been depleted, etc. I use it straight from the bail without alteration.

Obviously the right answer, rather than the obvious one about him admittedly not drying correctly.

A good reason to buy not expensive but decent seeds when you start. Buy a 10 pack of something that's a 'classic standard' and don't stress too much if you have trouble.

1) Those aren't COTYLEDONS......they're the first 'true leaves' of the plants. 2) Seedlings do funny shit...they grow out of it.

I give away 75% of what I grow, so that kind of stuff is why the market is in the tank. Not so worried about the law changing, I have the setup and seeds have been legal for years. I applaud their attempt at making the business socially equitable, but of course politics muddy the water. Also...

I'd guess there's more than just money as a leveraging point. I mean, that's probably the biggest, but if there was large enough public dissatisfaction, that also could cause some action...and I don't mean dissatisfaction about cannabis laws...sometimes its worth throwing the 'little things' at...

Its not legal on a federal level (country wide), it's only legal in states where they've made it legal, and the feds don't really care unless there's a 'big target' for them to go after. Each state has it's own capitol with elected law-makers and a governor to legislate & govern...so in many...