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Either way the pH seems to be the factor that is locking out, so whether in theory 5.8 is correct or not, its best to try and raise the pH to allow more of the potassium and phosphorous in. Sometimes as well, with some so called soiless mixes, there are so many other moisture buffering additives...

Just need to watch that you do not overdose them with the oil. It can clog the leaves from breathing and even cause burns due to the residues still present when lights are on. To put an end to infestations I have used products with cypermethrin in them. This seems to be the only way I have been...

Hard to tell from the pics. Could be a fungis of some form. Tell us a bit more about your setup. Air coming in, going out, pH of the feed, heat and humidity, yunno, all the details.

The general rule of thumb is the less stress the better. If you can do so, try timing it right where you switch them to flower at about 4 feet all and they will continue up to about 6-7 feet before their growth spurt ceases around week 3 of flowering. If they get a bit tall during that time you...

If you are growing in soil, the pH should be around 6.5. Those look pretty P and K deficient even though you are feeding them a lot of it. My guess is the pH is too low therefore locking out the P and K nutrients.

How does co2 get into your plants if you rip off the co2 receptors.

End of week four, expect leaves to start to lose nitrogen on some strains. The question is, how do the buds look?

Keep them wet and give them time. Seeds take between a couple of days and a couple of weeks to pop.

I would assume (I say assume because no info on grow type, hydro, bubble etc, and no pics) that they are asking for more nitrogen. Best do a new rez and set the ratio to more grow than bloom.

Let it time to recover. Further interference causes more stress and symtoms will get worse not better. It will recover as long as you dont panic.

Hydrogen peroxide is the better choice between the two. Sodium hypochlorate is inexpensive, but also nowhere near as affective as hydrogen peroxide. When it comes to root rot, you need to be able to constantly treat your roots to keep them in check as you never really get rid of it throughout a...

That looks very much like the mosiac virus, but if it makes you feel better, that is not an issue of luck or the lack of it. Since the virus is cross compatable with many plants its real easy to get, and many many growers get it but do not realize they have it as it often does not manifest in...

Barky soils will cause a nitrogen deficiency within a few weeks. Blue strains tend to need less nitrogen so will be less affected, but other than looking at pics, if its bark, you need to give them more nitrogen as bark like coco, leeches nitrogen.

What are you feeding them now in terms of NPKs. Do you know how many weeks that strain takes to mature? The reason I ask about NPKs is that for some plant families of the cannabis variety, too much nitrogen during budding will force them back into vegging again....in particular some of the...

You are looking for a fairly decent sized bug there. See if you can see them in under the leaves. If you cannot find an insecticidal dormant oil like neem, just use soapy water in a spray bottle. But on a plant that size, just use your eyes, look for the bugs and kill them. Hopefully they are...

When a plant is calcium and magnesium deficient it is often not related to a shortage of calcium and magnesium in the soil. I have vegged plants for 3-4 months as mothers in soil that only ever received regular fertilizer with no additives and never had a deficiency of those two. This not to say...

Think of a 400w HPS as steak, and your plants as 2 year old kids. Too much intense lumens of light. Plants can handle a lot of light pressure (lumens) but there are two conditions that they do not like in terms of 'a lot of light'. 1/ when they are young which yours are 2/ when the container...

When you topped it, what did you use to cut the stems, and how did the clones go, did they survive?

How old is it? Sometimes it takes a while for a seedling to kick into gear. Its best you do not try to push this to happen. 30% runoff in a pot that size would take a seedling weeks to consume. Leave it for 4 or 5 days to dry out, misting it mainly. It needs time to put its roots down. When it...

Firstly it looks like they need a bigger pot. Sometimes you get the odd plant that is sensitive to your regular feeding methods. In this case the leaves are reacting to something in the environment. So best thing to do is move her a little further from the central light to take some of the...