Hi i need some help. Over a period of about 7 days my plants have been getting worse. Leaves showing a deficiency (imo).

Im swaying towards mg deficiency but it could also be from a low RH.

I started them off in jiffy/rockwool blocks, but today i have planted into soil as i want to try and stabilise them before they all die. (will just keep them as mothers) Will then take cuttings and go hydro.

Whilst in Rockwool i was feeding them Formulex and a tiny amount of Superthrive @ EC 0.4-0.6, PH 5.9ish, Temps 19-28c RH 30-60%.

I dont know wether to do nothing for a few days and see if they perk up from being transplanted to soil or take action now. Problem being if i need to take action i dont want to get the "action" wrong.

Sorry the pictures arent the best, really need to sort out my shakey hand when taking photo's

I am planning to leave a large dish of water in box today to try n raise the humidity to see if that helps.

Some more pictures .. I was going to start a grow diary but i dont know if backwards diarys are allowed (one that shows the plants dieing slowly)

Hi Sunkk, sorry you're having problems. It helps if you fill in your profile, so we can advise you better.

If you've just transplanted them into compost I'd wait a few days, as it should contain all the nutrients they need. How old are the plants, and what compost are they in?

Doesn't look like Mg def to me, and in my admittedly limited experience the RH doesn't make a vast difference.

Best of luck with it.

Thank you for your reply Squirrel.

Profile now sorted

Using B & Q mutli Purpose 3/1 perlite

26 days old from seed.

Will be using weak nutrients (Formulex & House & Garden range from Van de Zwaan)

Will be watering with just ph corrected water for next few days to see how it goes.

Hi Sunkk. You don't need to pH your water in compost, the compost takes care of it automatically, just use tapwater.

Make sure you don't keep the compost too wet, wait till it has almost completely dried out before you water again, then give them a thorough saturation and repeat.

Best of luck with it.

I just gave them a good watering and one of the leaves that was very pale was extremly crisp and crumbled when i touched it.

I am sure i read this has to do with the low Humidity but i shall not doing anything drastic for the moment and see how they fare in a couple of days. ive left a large container with water in the room now and will keep that topped up. I want to get the humidity to about 60% so i can rule that out.

I really wouldn't worry about humidity unless it's ludicrously low.

In 12 years I have never misted my plants and my RH rarely exceeds 50 percent.
Come flowering I like it significantly lower.

Its sounds similar to a fungal problem i'm having. leaves are crispy on mine too.
Click to view attachmentClick to view attachment

Gonna rule out Low Humidty now then.

Hmm Fungus - Dont like the sound of that. Hopefully its not that as imo i have really good airflow, nice temps and a low Humidty.

Will monitor the leaves for the next day or two and report back.

Me too but still got it some how. Its nasty too

Repot them into a decent compost (westland with added JI) asap. B&Q compost plus your added perlite is crap & ain't doing them any favours.

I doubt i will have time within the next week to do so. I went for B & Q as i figured it wasnt that bad according to http://www.uk420.com/boards/index.php?showtopic=81121 it does say though that it wasnt favoured due to the variability of it.

Im going to have to stick with it i fear and see what happens. I used the same soil mix on my 1st bio grow and had 0 problems throughout so hopefully it will be fine.

Some more pics and now my clipper is twitching. i really dont want to lose these.

dont no wot it is mate, am new to this, but i hope all turns out ok for you and best of luck.

Thank you Ste. it feels like i need all the luck i can get ... or just some Guru to stumble across my post.

edit: going to try Epsom salts tonight i think even though 1 or 2 said it doesnt look like it. (Reason) It wont harm them if its not. And it sounds really like the description listed in the FAQ.

Magnesium (Mg)
Magnesium is a component of the chlorophyll molecule and serves as a cofactor in most enzymes.
Magnesium (Mg) deficiency:
Magnesium deficiency will exhibit

a yellowing (which may turn brown) <= Yes
interveinal chlorosis beginning in the older leaves. <= Yes
The older leaves will be the first to develop interveinal chlorosis. <= Yes
Starting at leaf margin or tip and progressing inward between the veins. <= Some did, some just appeared or so it seems in middle of leaf.
Notice how the veins remain somewhat green. <= Yes
Notice how the leaves curl upwards like they're praying? <= Yes

I havent got anything to lose by trying, but have a chance of reviving what seems to be a nice stocky plant. (5th node and about 5 inches tall)

It's not a (Mg) prob!

As i said, get them into some decent compost.

Ok i will take your word for it.

The problem did start before they were put into compost though.

Not doubting your knowledge in anyway and without trying to sound unappreciative but i am trying to learn so am going to ask the question.

What difference would a better compost make if the problem started before actually putting them into it? (i only potted into compost as my first grow went perfect (soil) and thought it may stabilse the problem).

B&Q compost is hit & miss - but it's usually shite. Adding perlite to it hasn't helped, & achieves nothing other than taking out what is good & replacing it with nothing.

IMO, i'd say the sorry looking leaves you've posted are due to a poor grow environment & maybe over watering. But i would say that they'll perk up after being repotted into a decent compost - with no added perlite by you.

I read that Perlite helps with trapping nutrients, water and oxygen, And helps with the grow in general. Damn advertising

Will try your advice, but i cannot get to B & Q before next Wed and the rate of decline on them at the moment they may be too far gone to recover.

Just out of curiosity though, im always up for constructive critiscm to improve my own knowledge.

You say a poor enviroment, yet from info i have gathered i thought i had got it just about right, I know it could be better with quite big fluctations in the temps and humidity, and maybe a little too much extraction for the area but from scouring the grow diaries mine is nothing out of the ordinary yet im getting this problem.

temps mainly between 20-30c, RH 30-60%, Fan extracting 175m3/hour ( 1.2 x 1.2 x .6m Growbox )

how often are you watering? and how how are you getting fresh air into the room?

Was letting the rockwool/jiffy pellets pretty much dry out before rewatering, when i potted into compost i gave them a little more just to settle the compost as the rockwool was still a little damp from the night before.

Fresh air from 100mm passive? (that were you have no fan and its just getting pulled through iirc)

Is it possible it could be a fungus as Brum suggested earlier? Some of the smaller affected leaves get crispy others dont.

Bah, just remember. i gave them a small misting with water/nutes the other night after lights out. Could it be burn if the mist had not all gone by lights on? It was very slight misting.

When repotting into compost you really need to saturate the compost using a fine rose watering can, so that water comes out of the pot drainage holes.



For a grow room of 1.2 x 1.2 x .6m a 100mm passive intake ain't going to do nothing mate. Ideally you need a fan bringing fresh air in as well as a fan extracting.

Get them out of that B&Q crap & into some westland asap, & make sure you follow a wet/dry watering cycle, ie - only water when the compost is on the dry side (but not too dry when compost comes away from the pot sides), & when you water fully saturate the root ball ideally using a fine rose until you have water at the pot drainage holes - leave the plants to sit for half hour & then tip out the excess. If they've taken up all the excess, water them again until they stop taking it up.

Ahh sorry. I have a 100mm Inline pulling the air through from otherside and the same size inlet with no fan on.

Thank you for the info so far. Im just gonna have to cross me fingers n try n get the new soil before wed.

Wish i had stuck to the good soil from the start. Never had any probs when i done me first grow ever. was just soil n perlite.

Seedlings do not require feed when in a suitable compost. And spraying with water is not beneficial & can cause probs like you have. Water them through the compost, & get them into a decent compost

and maybe invest in another fan to get a good supply of fresh air into that room!

Don't know much about soil gardening but for what its worth I think your problem is down to air circulation, I had a similar problem early in my latest grow and simply a broken oscillating fan was to blame; also still not entirely sure about your intake. In that space with your lights I don't think a passive will do it.

Anyway good luck bud, hope you get to the bottom of it

edit for grammar

Did it start at the bottom of the plant and work upwards?

I started giving nutes at about day 14 iirc. From seed.

It did start out to be a Hydro grow. . but kinda went compost when i paniced. Hope i havent stressed them too much

Yes Brum. I thought it was only affecting the older leaves but it started on the top ones also

edit: i just realised my profile said 2 x 400w i meant 2 x 200w.

I don't know mate it could be fungal, that starts at the bottom and some of your leaves look simialr to mine. You could try some Citrofresh, nothing to lose.

Just for those who tried to help. They seem to be fine now and i thin ki know what caused them to be in the state they were in. Bascially a couple of newb mistakes.

Underwatering followed by overwatering (trying to compensate for the underwater), when overwatering i added too much nutes then sprayed the leaves with the same water.

yes i know. what a fool but we all learn and the ladys are looking very nice ... Thank you for all the replys i had.

Onwards & upwards