Brown Spots and Yellowing of the Leaves

hey im growing a coupler plants on my windowsill there about a mouth old and have started 2 get brown spots on the leafs could anyone help me out plz
 
I see this post is from along time ago, but did you ever figure out the problem? I grow under FL for veg and CFL for flowering and I started putting my plants our to veg in the sun at about 80-85 degrees outside temp and they started to curl, yellow and brown on some leaves.
 
2 cjsesh00
Hi i am just wondering how u made up ur weak solution to spray on ur plants when they were nutrient deficient i have just noticed one my leaves r starting to turn and i want to sort b4 gets worse thanx
 
cjsesh00 said:
I had this happen to me recently, you really have to think about what makes sense here... I started researching plants and nute problems in general, aside from cannabis. My brown spots showed up and I initially thought it was some type of a deposit in the leaves, so I flushed and assumed there were still nutes in the soil. WRONG, once my leaves started to yellow I knew it was a N deficiency, and the brown spots were a P and/or K deficiency. SO i prepared a weak solution and sprayed the leaves the next morning before turning my lights back on. I pruned the damage leaves to rid them of the spots and see if anymore showed up... within 3 days the leaves were green and no more spots appeared. I tend to under fertilize the first few weeks and get a feel for my new strains ability to absorb nutes. they all work so differently it amazes me. Even within the same strain each plant has its own regimen. Hope this helps. Just remember to give them a little shot of nutes every time you water (2-4 days apart). Mainly macro nutrients are the ones that need replenishing more often than you think, but don't overdo IT! be gentle!
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would you say 4 weeks old is too young to spray with fert ?
 
Don't plan on getting one... I've had tthe same problem on EVERY plant... Not yet a correct answer. I've had to figure it out on my own!
 
answer to all the questions. red stems and leaves curling upwards is mag def. red stems and leaves curling downwards is N overfert. brown patches or spots with light coloured leaves is underfert N P K levels are too low. brown spots are an indication of potassium def. just add fertiliser with a good npk ratio. 2.1.1 for veg and 1.2.2 for flowering.
 
Holy fuck lots of misinformation here. Brown spots can mean LOTS of things. Most common is calcium deficiency. You can't accurately diagnose a plant without seeing pictures.
 
One thing you also have to watch out for is "bloom" nutrients or nutrients formula's for Cannabis having too little N during the flowering phase. I used to get the yellow leaves by week 3 with straight bloom formulas, best to keep the N higher until at least the stretch is over. Best of luck
 
sweetis said:
Holy fuck lots of misinformation here. Brown spots can mean LOTS of things. Most common is calcium deficiency. You can't accurately diagnose a plant without seeing pictures.
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Brown spots WITH yellowing and dieing off leaves. Most commonly N def, could be Cal def but most likely N def.
 
Be careful in diagnosis...overwatering, the MOST common mistake made by beginners, can also cause some leaf spotting and yellowing.
 
Ridicules statement.. Have you ever heard of Greenhouse Supplemental Lighting ?? Sun by day, Artificial at night, to stay at 18 on 6 off ?? Lastly, as bad as Mites are, nothing compares to Powdery Mildew..
 
sweetis said:
Holy fuck lots of misinformation here. Brown spots can mean LOTS of things. Most common is calcium deficiency. You can't accurately diagnose a plant without seeing pictures.
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Yes pictures say more than words.

beansbeansbeans said:
Anybody realize this thread is 5 years old
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5 years old and only one pic???

ndm1952 said:
Lastly, as bad as Mites are, nothing compares to Powdery Mildew..
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Really? I'll give you a hint to solve your PM problem...De-humidifier....JAS
 
i have 7 seedlings they are 8 days old growing like crazy,i have fed them twice espoma plant tone for fert it is 5 3 3 the last 2 waterings. only 1 plant has browning leaves. it was healthy and growing 24 hours ago. why is just this plant nute burning?0820152258.jpg
 
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