Leaves brown and curled need help

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Strain: galactic god

System type? Soil

PH of runoff or solution in reservoir? PH of imput is 6-6.6

What is strength of nutrient mix? 1000ppm range of fox farm organic nutrients

Indoor or Outdoor: Indoor

Light system, size? Vipaspectra. 300w led & 400w
Temps; Day, Night: 72-76

Humidity; Not sure

Ventilation system; yes

AC, Humidifier, De-humidifier: N/A

Co2; yes a co2 bag

Couple of questions - the bud with the drying up leaves - are that closer to the light then the others? How far away are the tops of your plants to the light?

Do you have a TDS meter and have you measured your water runoff - both pH and ppm?

Just off the cuff, looking at the pics, it looks like a potassium deficiency - the way the leaves are burned from the edges in. Although light burn has those symptoms too, as well as nute burn/pH issues.


Yes, @Sixpackdad is correct. It looks like potassium deficiency to me, but could also be too close to the lights.

New to growing but if it was light burn wouldn’t it have burned the leaves above the effected area?

Those leaves are newer and may not have had time to burn yet, but I think it’s a potassium deficiency. What is your Ph and PPM?



Your problem seems to be Phosphorus and here is a pic of it. Looks kinda familiar


Benefit: Phosphorus does a lot of things for the plant. One of the most
important parts of Phosphorus is:
It aids in root growth and influences the vigor of the plant and is
one of the most important elements in flowering as well helps to germinate
Phosphorus is an essential plant nutrient, and since it is needed in large
amounts, it is classified as
a macronutrient. Phosphorus is a MAJOR important nutrient in the plants
reproductive stages. Without this
element the plants will have a lot of problems blooming without proper
levels of Phosphorus.

When your plants are deficient in phosphorus, this can overall reduce the size
of your plants. Not enough
causes slow growth and causes the plant to become weak, to little amount of
Phosphorus causes slow growths
in leaves that may or majhy not drop off. The edges all around the leaves or
half of the leaves can be
brownish and work its way inwards a bit causing the part of the leaves to curl
up in the air a bit. Fan leaves
will show dark greenish/purplish and yellowish tones along with a dullish blue
color to them. Sometimes the
stems can be red, along with red petioles that can happen when having a Phosphorus
deficiency. This isn’t a
sure sure sign of you having one though, but can be a sign. Some strains just show
the red petioles and stems
from its genes.
So pretty much the overall dark green color with a purple, red, or blue tint to the
fan leaves is a good sign
of a Phosphorus deficiency. Having Cold weather (below 50F/10C) can make phosphorous
absorption very troublesome
for plants.
Many people get a Pho-phorus deficiency confused with a fungus problem because the
ends of the leaves look like
a fungus problem, But the damage occurs at the end of the leaves. side of the
leaves and has a glass like
feeling to it as if it had a ph problem. Parts affected by a phosphorus deficiency
are: Older Leaves, Whole
plant, Petioles.

Too much Phosphorus levels affect plant growth by suppressing the uptake of: Iron, potassium and Zinc,
potentially causing deficiency symptoms of these nutrients to occur def in plants. A Zinc deficiency is
most common under excessive phosphorus conditions,
As well as causing other nutrients to have absorption troubles like zinc and copper. Phosphorus fluctuates
when concentrated and combined with calcium

Problems with Phosphorus being locked out by PH troubles
Cold wet soils, acid or very alkaline soils, compacted soil.


Phosphorus gets locked out of soil growing at ph levels of 4.0-5.5
Phosphorus is absorbed best in soil at a ph level of 6.0-7.5 (wouldn’t recommend
having a ph of over 7.0 in soil)

Anything out of the ranges listed will contribute to a Phosphorus deficiency.

Hydro and Soil less Mediums

Phosphorus gets locked out of Hydro and Soil less Mediums at ph levels of 6.0-8.5.
Phosphorus is absorbed best in Hydro and Soil less Mediums at ph levels
of 4.0- 5.8. (Wouldn’t recommend having
a ph over 6.5 in hydro and soil less mediums.) Best range for hydro and soil
less mediums is 5.0 to 6.0. Anything
out of the ranges listed will contribute to a Phosphorus Deficiency.

Solution to fixing a Phosphorus deficiency
Some deficiency during flowering is normal, but too much shouldn’t be tolerated.
Any chemical or organic
fertilizers that have Phosphorus in them will fix a Phosphorus deficiency. If you
have a phosphorus
deficiency you should use any N-P-K ratio that is over 5.Again Peters all purpose
20-20-20 is a good mix.
Miracle grow Tomato plant food, Miracle grow All purpose plant food (Only mixing
at ½ strength when using
chemical nutrients, or it will cause nutrient burn!) Other forms of phosphorus
supplements are: Bone meal,
which is gradual absorption, I suggest making it into a tea for faster use, where
bone/blood meal is slow
acting, but when made into a tea it works quicker! Fruit eating bat guano, which
is fast absorption, Worm
castings, which is gradual absorption, Fish meal, which is medium absorption,
Soft Rock Phosphate, which
is medium absorption, Jamaican or Indonesian Guano, which is fast absorption.
Crabshell, which is slow
absorption. Tiger Bloom , which is fast absorption.

Here is a list of things to help fix a Phosphrus Deficiency.


Advanced nutrients Bloom (0-5-4)
Vita Bloom (0-7-5)
BC Bloom (1.1-4.4-7)
GH Flora Bloom (0-5-4)
GH Maxi Bloom (5-15-14)
GH Floranova Bloom (4-8-7)
Dyna-Gro Bloom (3-12-6)
Fox Farm Tiger Bloom (2-8-4)
Awsome Blossums


Dr. Hornby’s Iguana Juice Bloom (4-3-6)
Advanced Nutrients Mother Earth Bloom (.5-1.5-2)
Fox Farm Big Bloom (.01-.3-.7)
Earth Juice Bloom (0-3-1)
Pure Blend Bloom (2.5-2-5)
Pure Blend Pro Bloom (2.5-2-5)
Buddswell (0-7-0)
Sea Island Jamaican Bat Guano (1-10-0)
Indonesian Bat Guano (0-13-0)
Rainbow Mix Bloom (1-9-2)
Earth Juice Bloom (0-3-1)
BIO BLOOM (2-6-3.5)
AGE OLD BLOOM (5-10-5)

Any of these will cure your phosphorus deficiency. Affected leaves will not show recovery but new
growth will appear normal.

Now if you added to much chemical ferts and or organics,( which is hard to burn your plants when
using organics) You need to Flush the soil with plain water. You need to use 2 times as much water
as the size of the pot, for example: If you have a 5 gallon pot and need to flush it, you need to use
10 gallons of water to rinse out the soil good enough to get rid of excessive nutrients.

Note: Blood Meal, Dried Blood, Guanos, Kelp Meal, Cotton Seed Meal, Peat Moss,
Sulfur and fish meal are all acidic and can bring your ph down, so if you add these please monitor
your ph when using those.

Note: Bone Meal, Rock Phosphate, Wood Ashes pretty much all ashes, Shellfish Compost and Crab Meal are
all alkaline and can make your ph go up, so if you add any of these please monitor your ph.

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Phosphorus, of course, that’s what I meant, not potassium. That’s what I get for diagnosing while stoned. Thanks @garrigan62.

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Don’t feel bad cause I do it myself. and once in a while it will get by me before I can edit…….lmao


Sometimes I catch my mistakes, and sometimes someone else will, but as long as they’re caught it’s ok.

And that’s just another reason this forum is so awesome. 1

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@garrigan62 @raustin - for my understanding, what makes you think its phosphorus over potassium? When I look at the ILGM docs and some other internet site info, a phosphorus deficiency looks mottled and uneven as it messes up the leaf; where as the potassium deficiency starts with browning along the serrated edges and somewhat uniformly browning/yellowing the leaf on inwards from there. That’s what I saw in @LowGGrow115 picture, especially the bottom right corner leaves that weren’t all brown yet. Just curious, thanks!

It’s not potassium, it’s phosphorus, and best clue is the purple petioles, or leaf stems on your plant. Also, the leaves are burnt and turning up rather than down which means it’s not light burn.

All i can tell you sir, is that I explained it in my post and my pic is dead on to his or her’s

It was a PH issue, denoted by the curling leaves.

PH for soil should be 6.5-7.0