First time grower plant problem :-) any comments greatly appreciated

Hi Guys

first - thanks for being there! I have learnt a lot just by reading this forum. Now months after taking decision to grow my own sweet Marry J, I have my own plants and some puzzles to solve Any hints are greatly appreciated.

My grow room:
Plants: 2x feminised White Widow, grown from seed. WW1 is 14 days in Veg, WW2 6 days in veg.
Light: 150W MH lamp, 24/0 schedule, cabinet indoors, plants ~10cm below lamp
Medium: soil, Cellmax Universal Soil
Temp: 24-28C
Humidity: 40-60%
Height: 18cm

My concern is related to WW1 (the older one). She suffered from rookie mistakes, but still makes it

Issue description: yesterday I fed her 1/4 strength growing fertilizer (4-2-6, "cellmax earth grow mix") for the first time. In general she has responded very positively - all leaves grow very fast, she grew up 3cm in 24h - all very nice. Today I have topped her and noticed, that top leaves seem a bit light in colour and tips are yellow. See for yourself.

Unfortunately I don't have a digital pH meter yet. I'm temporarily using colour marker (a marker, which I add to sample of water & it changes colour according to pH). I'm trying to feed her water pH=6. Digital pH & EC meter on the way

Do you know what might be wrong?

I suspect she suffers from Mg deficiency (slightly purple stem & taco shaped leaves), but the yellow colour on top seems something new.

thanks a million for your help

some MarryJ porn:

WW1)

WW2)

Give it 2 pinches of epsom salt per gallon and it should fix it. Colored stems I was told is mag problems and the epsom always foxes it.

When I see curling up leaves like that the first thing that comes to mind is heat. But since you only have a 150w MH it should not be putting of that much heat. Which brings into question of humidity. Maybe too little? 12 to 16 inch for that hid is a good height.

get a bottle of cal mag and feed it to her a little it will help with the purple stems and plants love it, yellowing is usually a N problem. give her a couple days see wat she does. before u act she might still be digesting the nutes and come out looking great. as far as taco leaves. u want ur leave to curl up slightly towards ur light to me everything looks ok. give it some time.

Thanks a million for sharing your opinion!

Today I have bought epsom salts & prepared a full watering can with fresh water +1 flat tea spoon of salt/4L of water for tomorrow, when I expect the soil to dry out. In the meantime I have sprinkled some of this watter on the soil, hoping it will help at least a little bit. Tomorrow I'll water my ladies and see the results

btw. I'm sure the temperature & humidity is not an issue. Temp is well within reason, the lamp is in cooltube. I live in fairly humid apartment 60-70%, but the 40-60% in the cabinet is a result of light 24/0 & ventilation. I do nothing to induce humidity this low.

I don't see any mag issues or cal issues. I see healthy plants. the Epsom salts won't hurt. drench away. plus rep. nice start.

Does look to me like some mild light heat issues, Do you have a fan blowing between canopy and light? Apart from that there looking pretty healthy.
,

thanks you guys!

Indeed, the plant had suffered from rookie mistakes (overheated 2x, watered with too high pH for the first 2 weeks or so) in early days & the impression of heat issue has never disappeared from her completely :S I do have a fan blowing on her constantly, the lamp is cooltubed & I measure the temp right under the lamp (plants are actually lower then thermometer). So i'd be rather surprised if it was heat issue.

Earlier today I have watered her with addition of epsom salt, unfortunately in the meantime the yellow tips problem became more pronounced. See for yourself. It's only appeared on top leaves, nowhere else.

WW1


On the contrary WW2 looks great

WW2


Many thanks for your opinions

any hints?

How often are you watering? and have you figured out the PH? if you get it down to the color of 6 exactly that might be a tad too low, and if you keep fiddling with things like salts, ph, waterings, its gonna cause a lockout, which is what I think the brown spots are starting to be, also you might be causing nute burn as your soil says not to add nutes for a while

i am with peter. Was just thinking you are watering too often. Let it dry out a bit before next adjustment. i see just slight nute burn. And it might be time to transplant the big one soon.

thanks for tips guys

Indeed, as this is my first grow ever, I was torn how often I should water. Pls see a screenshot of my watering schedule in December.
I water only when the pot gets really light & obviously dry. But I will try to wait 1 more day next time & see what happens then.



For the moment it seems the "yellow tips disease" has stopped spreading.
Also just to be sure it's not heat issue, I have put the plants a little further away from the lamp, so that now I'm 100% positive it's not heat stress.

The brown spots are a leftover of rookie mistakes in early days. I also noticed, that brown spots have stopped popping up as soon as I had replanted her to the new pot 2 weeks ago (1L now). Next stop is 3.5L pot. I can already see roots growing out of the pot on the bottom. I think I will have her changed to the new pot next weekend. Hope this is not too late?

pH of water is still not under control as I still dont have a digital pH meter :S I expect it arrive this week. I go for Hanna 98129.

Also I don't see any pistils just yet. When do you think I should expect it?

looks healthy to me just leave it alone honestly imo. Too much love = death to these plants.

thanks a million for all your attention

so a lesson learned here: my plant doesn't need any fertilizer

As for Mg deficiency, it's getting definately better - leaves unfold & are less taco-like. I will feed it to her one more time & observe reaction - i hope, the taco effect will go away & I will stop for next few waterings.

pH/EC meter should be around any day now together with calibration pack for next 2y, so water soon will be as accurate as possible.

I'm going to repot her into 3.5L pot tomorrow & would like to switch her to 12/12 some time soon.

happy growing to you all