Yellowing Rusted drying leaves

Hello. Very new to this. What is this and how to resolve it?

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Sorry, but need a little more info. Please fil out the support ticket.

Support Ticket

COPY/PASTE the below list into your forum post.
Answer these simple questions the best you can.
If you do not know, or do not use something; Just say so = NA

Strain; Type, Bag seed, or NA

Soil in pots, Hydroponic, or Coco?

System type?

PH of runoff or solution in reservoir?

What is strength of nutrient mix? EC, or TDS

Indoor or Outdoor

Light system, size?

Temps; Day, Night

Humidity; Day, Night

Ventilation system; Yes, No, Size

AC, Humidifier, De-humidifier,

Co2; Yes, No

If you can, upload a picture of your plant. It helps the diagnosis, if needed.

Add anything else you feel would help us give you a most informed answer. Feel free to elaborate, but short, to the point questions and facts will help us help you


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Oh wow. I have gold leaf and OG kush from this seedbank. They are in miracle grow soil under 1000w led. No vent system. I was using my water the whole time w/o ph cause i have a home filtering system. The plant did fine with it. Just got a ph meter and found it was 8.3. Therefore i started with Ph watering 6.1-6.6 this past week. They are in 4th week of flowering. Started seeing these problems a week ago. I flushed twice already since flowering started. I started the tiger bloom fertilizer but only use 1/2 tsp cause they burned the first time with just 1tsp. I just remembered i inserted Jobe’s food spikes at the beginning of April. I put epsom salt and bone meal on top thinking it was phosphorus and cal mag deficiency. This is my first grow.


Ok, you’ve got a few problems going on here. First, the Miracle Grow is always a tough one to deal with because it has slow release nutrients in it. So when you flushed you released all those nutes which gave you some bad nute burn.

Second, you only just started to Ph your water from a very high 8.3 to a low 6.1. I don’t know how long you took to do this, but it should be done slowly to avoid shock.

Third, you added nutes to a soil that already has the slow release nutes, so you only made the problem worse. You made some typical noob mistakes, so let’s see if we can fix it.

STOP ADDING NUTES! Lol. If you can, try to take out that Jobes food spike. Normally, I would recommend a flush, but your soil makes flushing a problem, so I think you need to ride this out, and hopefully, get to harvest in a few weeks. You’ve added a lot of stuff to your soil, and I understand what you were trying to do, but the plant has nute burn, so the more you add, the worse it will get. I don’t think you have any deficiencies, so just try watering with plain, Ph water at 6.5. Your Ph should be between 6.3 and 6.8.

Let’s see how she does with that. If you weren’t in flower, I would tell you to transplant into some better soil, but that’s not a good idea with the plant at this stage. Again, let’s see how she does with plain water, and keep me updated. You can tag me by adding a @ in front of my name if you need help.

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Truth!!! I used MG and had to quit using any other nutes. Not being able to correctly water and give nutes to my girls has really diminished their growth. Learn from your mistakes and keep on keepin on. I already have my next seeds order in. Biggest and hardest lesson learned- DO NOT USE MIRACLE GROW.

Someone once said “if you can grow tomatoes, you can grow weed”, I beg to differ. Tomatoes thrive in MG, marijuana does not.



Here is a pic


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 seedlings.
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.