Leaves going yellow and brown? Help? (photos)

[Happy Crash]

Hi everyone,

I'm growing my plants outdoor, and they've been growing steadily for the past two months now. Lots of water and a bit of nutrition every week. But since a couple of days I started noticing discolorations in the leaves. Not just on the bottom nodes, but in the middle and the top as well. When I looked closer I noticed most of the leaves showing a very slight discoloration. I attached a couple of pictures to this post, but since it's my first one on this board, I hope it works ;) Can anybody tell me what's wrong with my plants and if they can still be saved??

[Zandor]

Do a good flush; most likely the cause is Toxic salt build up. It's always safe to flush when in doubt.

[Happy Crash]

I've been flushing past week, but noticed no real improvement, the discoloration is continuing, could it be a lack of nutrients?

[stankystank]

too much nutrients cut back on what your giving it for a while they should be fine then

[Zandor]

If you have flushed then go back to feeding them again and watch.

[HARDDON]

At first glance the general yellowing looks completely normal for this time of season for an outdoor grow getting ready to flower.

The main grow shoot tips look normal healthy and green.

They just look like normal life and now death to those leaves.

However, the pic that concerns me is number 3.

That looks like a fungus / mold that attacks rose plants, some grape leaves and other heavily flowering plants that have a high nitrogen environment.

If it is mold or fungus, either you remove those leaves right now....do not cross contaminate at all.....carefully grab them and take off leaving 1/4 inch of stem.

Remove the removed leaves far from the rest of the grow.

Are these 3 different plants or diff views of one plant?

Are you growing any other flowers or fruit trees near this?

[Happy Crash]

At first glance the general yellowing looks completely normal for this time of season for an outdoor grow getting ready to flower.

The main grow shoot tips look normal healthy and green.

They just look like normal life and now death to those leaves.

However, the pic that concerns me is number 3.

That looks like a fungus / mold that attacks rose plants, some grape leaves and other heavily flowering plants that have a high nitrogen environment.

If it is mold or fungus, either you remove those leaves right now....do not cross contaminate at all.....carefully grab them and take off leaving 1/4 inch of stem.

Remove the removed leaves far from the rest of the grow.

Are these 3 different plants or diff views of one plant?

Are you growing any other flowers or fruit trees near this?

I have 5 plants of the same strain (PP) growing, they are not in contact with eachother. All of them show the yellow discoloration, only one of them shows the brown spots on a couple of leaves. I will remove them as you said, leaving 1/4 inch of the stem. The brownish leaves also show a pink vein line going halfway through the stem.

I only have a walnut tree growing nearby, and some non-cannabis weeds in the garden.

[fhydro]

I think it's a magnesium deficiency. http://www.overgrow.com/growfaq/1382.
It looks like this.
Fhydro

[HARDDON]

DOnt worry about the red vein....that just means the leaf is finsihed interacting in a two way road with the whole plant and is no longer taking in nutrients...only going out.

Keep us upated please.

Daily pics would be nice til you sort this out.

I still think its just a normal process.....but those spots concern me. I have lost entire rose beds to something that looks like that...a mold.

[Happy Crash]

Everybody thanks for your concern, I must add this is my first attempt ever to growing cannabis, so I do get a bit worried about my babies sometimes ;)

I removed the leaves showing brown spots the way you told me to. I put the removed leaves in the garbage bin right away. so they shouldn't do any other plants harm.

The diffcult thing in this matter is that it could either be a fungus or indeed the magnesium deficiency (sadly I'm very unexperienced in this matter so I'll have to go by your best judgments), I will continue adding a regular amount of nutrients to the soil to see if there are any improvements as well.

Is this okay with you?

[Zandor]

The affected leaves will not change. You can only look for new growth and watch old growth to know if you have corrected the problem. I know how overwhelming this can get so I won't overload you yet....lol

Just keep us updated, growing in dirt takes about 4-7 day's to show signs of improvent.

[HARDDON]

I find a mag deficiency hard to imagine in an outdoor soil grow.

Perhaps your walnut tree has sucked it all out over time...but I dont know.

I wouldnt go adding a bunch of ferts to correct what may not be broken.

Give it a few days to see if any spotting occurs. Usually it will start on the leaf and turn it yellow from the spot outward.

I think it'll be fine though.

[Happy Crash]

The affected leaves will not change. You can only look for new growth and watch old growth to know if you have corrected the problem. I know how overwhelming this can get so I won't overload you yet....lol

Just keep us updated, growing in dirt takes about 4-7 day's to show signs of improvent.

I'm beginning to get a pretty good idea how extremely expansive the subject of growing plants must be. Since it's my first attempt ever I decided to keep things simple, just pot the plants, water and nute 'em, and watch them grow. But once potential trouble arises there are so many possibilities and things to watch out for. I hope I can just keep on learning about this matter!


I find a mag deficiency hard to imagine in an outdoor soil grow.

Perhaps your walnut tree has sucked it all out over time...but I dont know.

I wouldnt go adding a bunch of ferts to correct what may not be broken.

Give it a few days to see if any spotting occurs. Usually it will start on the leaf and turn it yellow from the spot outward.

I think it'll be fine though.

The plants are individually potted, so they're not in contact with the same soil as the walnut tree. A sunflower did sprout in the garden as well, and that plant is showing the same brown spots on the leaves, I'll keep a wary eye out and I'll post new pictures soon.

[HARDDON]

A sunflower did sprout in the garden as well, and that plant is showing the same brown spots on the leaves, I'll keep a wary eye out and I'll post new pictures soon.

Since they are in seperate pots....and a sunflower has the spots as weill, I feel comfortable advising this is prolly a mold problem.

If it is, it will not go away and will destroy the whole plant if something isnt done.

I have somewhere a listerine, soap and beer formula that is perfect for dealing with this type of mold. I will see if I can find it.

You may want to consider the commercial full fledged fungicidal therapy spray solutions although I have no idea what smoking it may do or any other application issues with MJ.

I will look for my tonic recipe for mold.

[gronnh20]

Sometimes when plants get root bound in their pots the leaves will yellow in the middle of the plant. I would try repotting them to bigger containers.

[MyMindIsGlowing]

looks healthy besides those spots.

[ku420guy]

not enough nitogen thake a leak on them

[Zandor]

not enough nitogen thake a leak on them
Don't piss on your plants it's just stupid.

[Happy Crash]

No I'm pretty sure it's a mold. Other plants in the garden are showing the same symptoms, and they are not potted. For now I've clipped off the "infected" leaves on all plants in the garden and putting them in a sealed container.

The spots kept spreading on my babies too. Start out as small brown dots, then growing into spots with a lighter brown "halo" around them. Infected leaves turn yellow at a hellish rate. I hope there is a cure for this?

I'll make some more pictures when I get my cam back (somebody borrowed it from me for a couple of days)

[Happy Crash]

Since they are in seperate pots....and a sunflower has the spots as weill, I feel comfortable advising this is prolly a mold problem.

If it is, it will not go away and will destroy the whole plant if something isnt done.

I have somewhere a listerine, soap and beer formula that is perfect for dealing with this type of mold. I will see if I can find it.

You may want to consider the commercial full fledged fungicidal therapy spray solutions although I have no idea what smoking it may do or any other application issues with MJ.

I will look for my tonic recipe for mold.

Harddon, did you find the tonic recipe yet?

[1dwgsmksreefer]

DUDE ! MY PLANTS ARE DOING ABOUT THE SAME THING MY 1st TIME DOING OUTDOOR OR ANY PLUSH PLANTS. SUCKS HUH! .IM THINKING NATURAL ? BUT ? THE MORE I READ THESE REPLYS THE MORE IM PUZZELD ? IF THEY ARE PH OR BUGS OR NATURE
IM DYING TO KNOW AS BAD AS YOU!!! IF YOU HEAR SOMPIN / FEEDBACK 2 ME O TAY

[1dwgsmksreefer]

UHHH ! OOOOOPS SORRY! ;)

[HARDDON]

Shit dude sorry but i forgot all about this thread.,

I rarely visit here....

If iI were you i would tear down every plant near yours that there is that is infected with the spores. You cant leave any around.....come flower time, it may net be possible to stop itl.

I would definately go get some chemical fungicide or mold spray and dowse the entire area....

Get rid of all other infected plants, trees, brush, etc.....
Spray with comercial mold killer....

Or....if it isnt ALL THAT BAD...

Try this... :)

1 tbsp. of baking soda
1 tbsp. of light vegetable oil
1 tbsp. of baby soap
1 gallon of water.

Mix it all up in a gallon jug then transfer to spray bottles and start spraying.

Spray everywhere and everything in sight.

Hope I could help in time.

[Happy Crash]

Well we're a couple of weeks further now, tore down all the other plants in the vicinity (except for the walnut tree ofcourse; I huffed, I puffed, but I could not blow the damn thing down :D )

Also, the past couple of weeks have been nice, dry and hot, with lots of sunshine. Both factors helped get rid of the fungus / mold. Plants are well into flowering now and ready to be harvested in about a week or 2.

I'm guessing the fungus did have its effect on plant growth, though. Plants of a friend of mine who is cultivating the same strain are noticeably bigger, but still I can't complain, this being the first batch of cannabis plants I tried to grow.

Fingers crossed; hope I don't get any other trouble next two weeks; plants of that same friend of mine are suddenly infested with spidermites...

[HARDDON]

I was wondering what ever happened to your plants. Thanks for the updates.

Would love to see some pics.

[Happy Crash]

Wow, never got round to answering that question, Harddon. Still active on this message board?

Last year's crop still yielded pretty good results, after the hot and sunny weather and clipping the leaves the mold problem was pretty well under control. Got a nice bedspread full of fun from them and giggled my time away on it.

A new crop is now ready to go into the flowering cycle. I'm making a lot of pictures this year and I'll post some too!