Light brown spots on one of the leaves

Hello guys.

I believe my indoor girl started to have some kind of problem and I wanted to share with you at the very early stage and looking for an advice to avoid being late :slight_smile: I need your help please

Here is two images, one is the full plant and other is the leaf that has the spots.

Type, Bag seed, or NA
Autoflower NL

Soil in pots, Hydroponic, or Coco?
Soil in pot

Age from sprout?
6 weeks

What is strength of nutrient mix? EC, or TDS
650-700 ppm

Indoor or Outdoor
Light system, size?
Indoor with CFL lights

Temps; Day, Night
20 - 24 c
Humidity; Day, Night

Ventilation system; Yes, No, Size
No, the room has window :slight_smile:

AC, Humidifier, De-humidifier,
None, I’m using heat light to maintain the temp

Co2; Yes, No

1 Like

Any chance you spilled some nutrient solution on the leaf there? One spot on one leaf is not usually indicative of a problem.


I probably did. But it was mixed with water. Would it cause this?


I see you just joined us well then "WELCOME TO ILGM "

Your plant seems to be coming down with what appears to be

This pic is Nutrient Burn in force but very similar to your plant which make me believe that this is what it is.

The reason for this is, because a newer grower will use a chemical nutrient
most of the time and listen to the directions on the box. This is a NO NO!
Depending on the age of the plant, size, strain and soil mixture you are using
also has a factor. There is no set guideline when using nutrients, but I can
give you a good example to start out with so you will not burn your plants.
It’s always good to start out light, rather than feed heavy. Remember you can
always add more later, but can not take out when you added to much. Chemical
and Organic nutrients differ. Chemical nutrients are more readily available
and can burn way easier than organics can. Organics are easier for a newer
grower to use, most of the time, and lessen your chances of burning your plants.
I recommend not using more than ½ teaspoon of chemical nutrients per gallon
of water. Unless the plants are very big 5 feet+, then it’s safe to use 1
teaspoon per gallon of water. When your plants first emerge you want to wait
at least 2 weeks before feeding your plants, unless your plants are in a soiless
mixture, like pro mix. The cotyledons (its first set of round looking leaves) are
what give the plant its food until they get the first 2 or 3 sets of leaves. If
your plants are in a soiless mixture and are over the first week of age; you can
feed a weak amount of nutrients, like ¼ teaspoon per gallon of water. Soiless
mixtures are different from soil plants and soiless plants need to be fed more
when using this mixture.

I also recommend not feeding more than 1 time a week if using ½ teaspoon per
gallon of water for chemical nutrients. You can feed every other day,( this
goes for chemical and organics) at very weak amounts, but doing this may contribute
to over watering, and for that I do not recommend feeding more than once a week.
Some people feed 2 times a week using like ¼ teaspoon per gallon of water… Use 1/4
strength for first feeding and then go up to 1/2 strength from the 2nd feeding when
using chemical nutrients. It’s very easy to overdo it. When using organics, depending
on which one you’re using, I recommend using 1 teaspoon per gallon of water. When the
plant gets bigger you can work your way up to using more nutrients when the plants
get bigger.

As for soil mixtures, there are a lot of different kinds of soil’s out there. Using a
rich soil mixture is not recommended for seedlings. Seedlings that are under 2
weeks of age you do not want to start them in rich soil, using a seed starter
mixture is one of the safer ways. Seed starter mixtures are weak in nutrients,
so it will not burn the seedlings but will provide them enough to get past seedling
stage, but the downside is you have to transplant into a better soil mixture after 2
weeks of age. If you decide to start with this mixture, do not put your seedlings
into a big pot. Start them out with using a cup or a small pot.

Nutrient Burn causes leaf tips to appear yellow or burnt. They can also be brown
and twisted and crispy looking. Depending on the severity it can show many different
symptoms and shows on lower part of the plant when its young, at older stages it
can move anywhere on the plant. The burn will creep into the center of the leaf
causing it to curl and dry up. It depends on the specific nutrient that is in excess.
For example, too much nitrogen causes leaves to curl downwards and too much potassium
creates brown spots near the edge of the leaf. Either way, nutrient burn may potentially
kill your plant or lead to it having a strong chemical taste.

To fix the problem when you have Nutrient burn, you want to flush out the plants
with lots of water.


Soil should be flushed with lots of water, Use 3 gallons of water per one gallon of soil.
Flush very thoroughly, after plant recovers usually after a week, you can resume using
nutrients after a week or a week 1/2. When you flush your soil, you flush everything out,
a lot of nutrients go with it, including the soil nutrients.

Hydro `````````````````
Change out the reservoir, flush out any lines and clean out the entire system and
replace with plain water for the first hour, then start out with lower parts per
million (PPM)
Its good to clean out your system every 2 weeks and replace with fresh water and
nutrients. Some people change everything every week!

Ahh, nute burn! Stop this by not adding to much chemical/organic nutrients to your
water,foliar feeding. DONT feed more than 1 time a week unless using weak amount,
use 1/4 strength for first feeding and then go up to 1/2 strength from then on when
using chemical nutrients. Its very easy to overdo it. Causes leaf tips to appear
yellow or burnt. NEVER give nutrients to plants that are under 2 weeks of age, at
this age the soil nutrients are enough to suppliment them untill 2 weeks of age or
more depending on how good your soil is. Using ferts before 2 weeks will almost
likley kill your plants.


Thank you guys for the the very warm welcoming. Your advices are really helpful. @garrigan62 I believe you are right, I fed it twice last week with 1/3 teaspoon nutrients in only 2L water. But I added so to reach 650ppm as per this soil grow schedule Easy Grow Schedule For Soil Growers & Fertilizers

Perhaps I didn’t need that much because the soil itself contains enough nutrients so far.


You caught it just in time. You can get it to clear up jus by watering ONLY for the next few waterings.
I’m glad for ya.

1 Like


Are you using ILGM flower power nutrients? I use them at 1/4 dosage when I water. I had all sorts of overnuting issues with my first two grows using full dosage. Once I went to 1/4 dose and stabilized my pHing at 5.8 for my coco, I haven’t had a nute issue since.