whats going on with plant middle of leafs turning black

Can someone tell me whats going on. The middle vein of lots of leafs are turning black?

Looks like iron deficiency.

You should check this thread for plant issues. It has them all.
https://www.rollitup.org/marijuana-plant-problems/488004-guide-nutrient-deficiency-toxicity.html
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Iron defeciency begins at the top and works its way down the plant as it progresses , these charts are not always viable . Your plant is lacking cal/mag and is slightly rootbound . The coloring is from cool night time temps and it would be purple if healthy . Phosphorous uptake is slowed down with cold soil by the way as this is also indicated in your photo

ProfessorPotSnob said:

Iron defeciency begins at the top and works its way down the plant as it progresses , these charts are not always viable . Your plant is lacking cal/mag and is slightly rootbound . The coloring is from cool night time temps and it would be purple if healthy . Phosphorous uptake is slowed down with cold soil by the way as this is also indicated in your photo

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I'd go with this answer. I just looked at what it was similar to and made a guess.

Hmm I dont think its cold temp. My area hasnt been below 70 even middle of night since I planted them. There in 5 gallon buckets and I thought 1 gallon for each foot was enough and the plants barely over 2 and half feet? A lot of the leafs are turning bleach white to.

661budz said:

Hmm I dont think its cold temp. My area hasnt been below 70 even middle of night since I planted them. There in 5 gallon buckets and I thought 1 gallon for each foot was enough and the plants barely over 2 and half feet? A lot of the leafs are turning bleach white to.

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70 is a bit cool for some strains and again the theory of bucket and plant size varies as well , especially if your relying alone on organic soil . Not sure what its in or being fed ,but it sure looks hungry for more

More info such as soil type , Ph & feeds Ect will be appreciated by those following and offering advice ..Peace

Ok well some more info they are in 5 gallon pots in miracle grow soil mixed with dirt from my yard about half and half. This is my 5th year growing always used this soil and regularly get 1 to 2 pounds a plant. This is first year ive ever planted in buckets tho usually go straight in ground. This is also first year using added nutrients aswell. Funny its my first year having problems. During veg I gave half the plants miricle grow all purpose the other half alaks fish crap I forget full name. During flower ive given all the plants fox farms tigef bloom and brare rabbit mollasss. The plant in the pic is the only one with the black spots in middle but all the plants have had lots of leafs turning bleach white and dying. The plants. Were from clones the pictured strain was called deep sleep the other strain I have growing is super blue.dream. its hot here temps regularly 95 plus during day but like I said growing 5 years here always been fine before.

Also does anyone know if poor drainage could cause this. The soil has gotten really hard and takes long tims for the water to run through.

"bleach white and dying" with the pics say;

That and the miracle grow mixed with other nutes show you have to high a P&K problem.
M-grow is not for MM. The NPK ratio's (not to mention the micro nutes) are all wrong. you've gotten away with using the soil in the past cause it was in the ground so the included nutes could spread out and be optimized by the microbes in the natural soil. Now you have that in pots thus limiting the "off ratio" M-grow to spread out to lower more tolerable concentrations and the fact that the living things in your soil have been dealt a rather harsh blow.
Your in flower so corrections will not show up as there is no new veg growth to show it. BUT to get the best out of what remains I suggest a good wash and to restart feeding a more MM balanced flowering NPK ratio nutrient. I would also add some sort of micro tea to reintroduce the living microbes to the soil !

Their not dead and will finish, just be prudent with your nute ratio's and you'll finish these out ok.

Good luck


The darkening IS from lower temps, most likely at night...No problem really.

Makes a lot of sense thnx for info