Plants stopped growing / frowing really slow

basically have a 2 light set up. got the plants from cuttings at 2/3 weeks old and have had them for 5 weeks now. first two weeks the grew really quick but then stopped growing? some dropping and yellowing of lower larger leaves and seams are red/purple.

E-indoor
E-coco
CSL-b-cuzz
E-Water source -- tap water
E-Source water pH -- 7
E-Age of plant -- 7 weeks
E-Type of fertilizer - b-cuzz a+b
E-Lighting source and distance from plant - 600 watts light / 1 mitre
E-Air temperature (both day and night if you are running a dark period) - 25c day / 18c night
E-Air % Relative humidity - ranges between 30-60
E-Lighting schedule - 18 hours
E-Type of ventilation your room has - intake and outtake fans
TR-Did you pre-soak your media in pH corrected solution? - use ph down to correct ph to below 6

sounds like the first 2 weeks your roots expanded and you had good growth ...now they are probably bound transplant into bigger potters

How and why are you adjusting the ph down to 6.0? Especially if you are adding nutes after adjusting. Way too low for soil, but I've never grown in coco. Target ph should be around 6.3 to 6.8.

...And why is your 600w light 1 meter away? (should be within about 1/3 to 1/2 meter, maximum)

What did you change after two weeks, and why?
What are you using to adjust your ph?
What's the runoff ph?

pots are defo big enough. need to check the run off ph and use a ph down to adejust at the mo......basically think it's a over water/feed or root probelm but unsure how to work that out?

pics>>

Flush your plants, - Don't water for three days afterwards.
And drop the humidity if you can for a couple days.


Hope this helps.


:cool:

I'm coco clueless as well. good luck.

I was just helping a bro of mine with root rot that looks just like that. H2O2 and they were coming back but then stopped again. Once you got the rot it's hell.

Quote:

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Originally Posted by seanysean

basically think it's a over water/feed or root probelm but unsure how to work that out?

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Is this what all of the leaves looks like, and what part of the plant did they come from? Have you recently started or stopped adding anything? (CalMag, molasses...)
Are the greyish-brown spots mushy...? Or does it rub-off?

Have you been foliar spraying them too much? (trying to 'color-up' faded leaves?) Looks like damaged/clogged leaf pores. Doesn't look like the root rot I've encountered in the past, but I avoid root rot and haven't seen it in my garden in years. However, my root rot was showing a deeper yellowing from lockout, with the same greyish-brown necrotic splotches seen in your photo.

If it is root rot, I'd change my watering schedule, trim the roots and re-pot. Shouldn't be a major problem if it's 7 weeks from seed. (she can recover) If 7 weeeks into flower, good luck...should have called earlier, lol.
Seriously, if it's been 7 weeks in flower, you've got a choice to make. Either ride it out, or, repot in fresh soil. (trimming off dead roots) But this will delay further growth till stabilized in it's new soil, and depending on genetics, might stress it into becoming a runt or a hermie.

If it's mold (the dark splotches rub-off) or neckrosis from spraying too much, (clogging pores) I'd stop spraying. I spray maybe once a week in veg, but never in flower unless it's to correct defeciencies.

Kinda hard diagnosing root rot online, as most gardeners attempt to correct the initial stages with magnesium or iron, which compounds the situation, and changes the physical expressions of the underlying problem. (and it seems nobody except the hydro guys include pictures of their roots, lol)

Low doses of H2O2 is fine for early root rot, but adding too much, is like pouring salt in a wound. Plus it kills the bioactivity in your soil. Some folks swear by it as a regularly-scheduled additive...I'm not one of those.