Help diagnosing problem - pic attached - please give a quick look

I have of course consulted the infamous chart and don't see anything quite like this. Plants are developing nicely and seem happy but just started getting this discoloration. Strain (Barnie's Pineapple Chunk) seems to like heavier nutes than most but I have been careful not to overdo it.

What do you think this is? The discoloration looks more pronounced in person...

how far into flower?

Yo bro, its the start of a phosphorus Def.

Check this out -----> http://www.mandalaseeds.com/Guides/Marijuana-Nutrient-Problems

Five weeks into flower. P def from that link does look like it. I use Dyna Gro and have been mixing the grow and bloom. Looks like time to go all bloom.

whats your night time temps?

I would start with a good flush. P deficiencies from a lack of P in the diet are pretty rare in container grows. They are more often caused by salt build up in the medium locking up the P from the plant. Add about one tsp. of pure lemon juice to your flushing solution to help break some of the salt bonds.

Nightime temps around 65. Daytime 75-80. But it had been colder in the past.

I have not done an official flush but do use Drip Clean with every feeding (whether with nutes or just H2O). I only water until I get a little bit of run off so maybe I will go heavier when they get a water only one tomorrow.

Agree a P. defeiency for sure, and yes night temp`s can have a effect, if really low (in the 60Fish) the medium will lock in the P with the same effect as too little in your feeding schedule, or a too low PH (a way too high PH can also have the effect) are your steams red/pink as well ?




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Here is some good read, scroll 60% down and you find P def.

http://www.growweedeasy.com/marijuana-symptoms

I gotta agree with others here. P def. Probably due to lockout cause of salt build up. Ever flushed your plants?

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Thanks Slipon...

So thoughts... Drip clean should be preventing salt buildup. So I am not sure that is it. I do have many purple stems. But....

I use a halo drip system for watering. It is all manual, gravity fed out of a five gallon bucket. Normally, I would put the water in the bucket in the morning, let an air stone run for an hour, and then let the dripping begin. The last couple of weeks, I put it in the night before so it could get more air in it. So I am wondering if the cause is that the water has been too cold after the night.

Thoughts? Might I fix it by just using warmer water?

Whats the PH of the water before feeding & after, in the run off mate?

PH in is 6.5. I haven't tested run off or soil recently but have never had an issue with it when I have on past grows and everything is the same. Will do when I water mañana.

Ok, so I read the post all the way and re-looked at the picture,,,,,and,,,,,It is NOT P def!!! If it is any type of nutrient related cause.....It would be K. AND it's NOT a problem!
The purple being expressed in the plant can come from several things.

Night temps (May be a minor factor and only in relation to the K level , unless the 65F is hitting lower then you think)

Rise in K level/higher K level (This appears to be the ticket here in relation to the night temp swing and the strain) You can add some K at flower to express the "hidden" purple in some strains. Humbolt's Snow Storm Ultra does this very well. Plants that are being supplemented with high K silica's also tend to show this! I might venture that your using DynaGro and if your using their Pro Tekt. That would be the contributing supplement! (Interesting that your mixing the grow and bloom. I would like to see pics of the whole plant if you could-please).

The strain can express a purple on it's own. Some pheno's more then others! (I run a very Sativa Pineapple Express that with some prudent use of the Snow storm ultra, I get VERY purple plants at harvest.)

You don't say if your in flower (I suspect) or not. At any rate. What you've got going is OK. DON'T WASH! Keep going.

Here are a couple pics I took earlier. Need to do some without the lights on, I know. But it is lights off time now so they are at rest.

Here are a couple pics I took earlier. Need to do some without the lights on, I know. But it is lights off time now so they are at rest.

View attachment 3021950View attachment 3021951

This is Jackie she is a fem auto Jack Herer, Jackie is 25ish days old and early on suffered some nute burn. im using 5 23w 5000k and 1 23w 2700k cfls and fox farms ocean forest soil. as my nutes im using tecnaphloras success kit. so far ive been using a 1/4th strength mixture. jackie isnt getting very tall but getting bushier every day. is this normal for autos? View attachment 3022310

spencerl1 said:

This is Jackie she is a fem auto Jack Herer, Jackie is 25ish days old and early on suffered some nute burn. im using 5 23w 5000k and 1 23w 2700k cfls and fox farms ocean forest soil. as my nutes im using tecnaphloras success kit. so far ive been using a 1/4th strength mixture. jackie isnt getting very tall but getting bushier every day. is this normal for autos?

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Next time. Start you OWN tread and don't highjack someone else's!
It looks fine.

I posted regarding the purple red leafes and i was told in this very forum it was down to night time temps i got a plant going now if it isnt sat on the heater it turns that colour same as the stems, But im a noob

DroidBoy said:

I posted regarding the purple red leafes and i was told in this very forum it was down to night time temps i got a plant going now if it isnt sat on the heater it turns that colour same as the stems, But im a noob

Click to expand...

Yes you can get plants to express coloring by having low night temps only. But 65 is not quite going to do what he has going on. The "timely" addition of K will also express plant coloring IF the plant HAS the potential TO! The combination of a 15F night time temp swing (more pronounced if the temps go down to 55 or less) and the addition of a K supplement can create VERY purple plants.......
Some plant strains express their colors as reds to oranges and browns.