Lower leaves yellowing

Anyone know what’s going on with this plant? Here’s the info:
Seed: Blue Dream Auto
Soil: FFOF
Lights: HLG 260 XL Respec
Nutes: just once, Fox Farms Big Bloom
Indoor tent grow

Sprouted on 3/18 and started flowering about 2 weeks ago. I tested the runoff and the PH is 7.1, and the PPM is 395. Thanks in advance for any help!


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If ppm out was 395 then she’s probably hungry. Also if ph out is 7.1 that’s a bit high. Yellowing leaves is sign she needs to be fed. I’m going to tag a couple of people to help. @Myfriendis410 @Hellraiser @Skydiver


Depending on the strain, leaf abscission of older fan leaves (not sugar leaves) are a normal process.

As Bulldognuts indicated, your pH is a little high and I notice yellowing on the tips of leaves that should be green, a pH adjustment is necessary and it may also be hungry, but can’t tell while there’s nutrient lockups at that pH level.


nice word. I wasn’t familiar with the term and looked it up. Always good to learn something when most people sleep.

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I’m going to order some PH Down, but in the meantime with deliveries being so slow, is there anything I can pick up at Home Depot to lower the PH? I did a Google search and saw something about lemon juice, would this be safe mixing with water and then I’d test the PH before watering? Thank you!!

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I know what’s going on here.

Here is a pic…>thJ9CM2H1T

Nitrogen (N)

Low nitrogen is generally characterized by an even yellow or gold color of the lower sun leaves.
Slow growth and undersized leaves and red stems are also clues. Adding a high nitrogen fertilizer
should remedy the situation within a few days and will be accompanied by green, lush growth.
Nitrogen (N)

Low nitrogen is generally characterized by an even yellow or gold color of the lower sun leaves.
Slow growth and undersized leaves and red stems are also clues. Adding a high nitrogen fertilizer
should remedy the situation within a few days and will be accompanied by green, lush growth.

Nutrient Deficiency

Nitrogen deficiency

Nutrient Deficiency

Nitrogen deficiency

THIS IS LONG BUT VERY HELPFUL ( Just coppy to your files OK ? )

First off, some interesting, basic facts…

Your marijuana plants need 18 essential elements. They get carbon, hydrogen,
and oxygen from atmosphere and water. They get the 15 other elements via their
roots. These elements are sometimes grouped as major, secondary, and trace elements.
The groupings are determined by how much of each element is needed–some are needed
a lot more than others, but all are necessary.

The major elements are nitrogen, phosphorus, and potassium. The so-called secondary
elements are magnesium, calcium, silicon, and sulfur. Some people group these seven
elements as “macronutrients” because they’re required in larger weight amounts than
the remaining essential elements your plants need. Those are called micronutrients,
and they’re very important even though your plants don’t need as much of them. We’re
talking about iron, zinc, copper, molybdenum, boron, manganese, cobalt, and chlorine.

Until recently, silicon wasn’t even included in the essential element list, but modern
research on marijuana plants indicates your plants use silicon to build strong cell walls,
resist pests and diseases, and to create THC glands.

Nutrients problems most likely to reduce growth rate, THC percentages, and harvest
weight often involve nitrogen, phosphorus, potassium, and calcium. But problems with
deficiency or excess of any of the 18 essential elements is likely to cause serious
trouble for your marijuana plants.

How do you know your marijuana plants have nutrient deficiency or excess? Look at your leaves.
If they’re not lime green, upright, and looking like the perfect marijuana leaf photo
accompanying this article, your leaves are trying to tell you something.

But here’s a twist…it may not be your organic fertilizers, soil, or hydroponics nutrients
that are actually causing the problem. Signs of nutrient element shortages or excess may
merely be a symptom of the real cause of the problem. For example, low temperatures
interfere with nutrient uptake. So you can’t solve a temperature-related nutrient
deficiency problem by increasing your nutrients dosing…you solve the temperature
problem instead, so your marijuana plants can take in what they need.

The Right Amount of Nitrogen
Makes Your Marijuana Healthy and Green

Nitrogen makes up 78% of the dry volume of our atmosphere and plants need to
capture it if they want to grow at all.

No doubt you already know nitrogen is the big N in the N-P-K on your hydroponics
nutrients bottles, and it’s a big, important ingredient for your marijuana growing success.

Unless your plants are in the final weeks of flowering phase, yellow leaves
(especially lower leaves) are signs of trouble, and the troubles are most often
a nitrogen deficiency. It starts with the bottom leaves and works its way up until only
the newest growth is green.

On the other hand, if your marijuana plants are overdosing on nitrogen,
the leaves will be extremely dark green.

Either way, nitrogen problems mean big trouble for your marijuana plants because nitrogen is
absolutely necessary for plant survival because nitrogen is a primary elemental support for
protein synthesis, growth, leaf development, metabolism, and root health.

If you oversupply nitrogen, you get marijuana plants that are too tall, thin, and gangly.
It’s harder to get successful flowering from plants that have been overfed nitrogen.

If you see that the very tips of your leaves are yellow, that’s an almost sure sign of nitrogen
deficiency, which occurs most often during a fast-moving grow phase or when you’ve switched
to an improperly-configured bloom fertilizer during flowering. Many brands of hydroponics
nutrients do not contain the right ratios of nitrogen, phosphorus, and potassium, or they
contain the elements in forms that are not easily available to your marijuana plants.

These potential nutrients problems are especially harmful in flowering phase, when your plants
only have 12 hours to run their photosynthesis metabolism.

Nitrogen deficiencies first show up as leaf tip yellowing, especially on lower leaves.
Then it spreads to affect entire leaves, and moves up the plant. When you do research
on marijuana strains before you buy seeds or clones, take note of the strains that are
said to be heavy feeding. Those will likely want higher parts per million of nutrients,
and they are hogs for eating nitrogen, potassium, and phosphorus. In bloom phase, your
marijuana plants want less nitrogen, and more potassium and phosphorus.

The only time you tolerate signs of nitrogen deficiency is when you’re more than halfway
through flowering phase. During those closing weeks, your marijuana plants are focusing on
floral production so they sucks stored nitrogen out of leaves rather than doing the work of

That’s why you don’t need to add extra nitrogen (beyond the amount found in a properly-configured
flowering base nutrients product) to flowering crops after they’ve passed the midway point of
flowering cycle: excess nitrogen during flowering negatively affects bud development, taste, and aroma.

Fixing Nutrients Problems to Save Your Marijuana Plants

In later articles in this series, you’ll see a more detailed program for analyzing and fixing
marijuana nutrients problems but it’s important to understand a couple of things right away.
One thing to know is that organic or “natural” fertilizers often fail to remediate a deficiency
fast enough because they aren’t immediately bioavailable to your marijuana plants.

If you’re absolutely sure your marijuana root zone pH, grow environment, water, and other factors
are what they should be, and your plants are still showing signs of nitrogen deficiency in soilless
hydroponics marijuana growing, it almost has to be that something’s wrong with your base nutrients.

What are your remedies? If you’re growing in soilless hydroponics using synthetic hydroponics
nutrients, you have it pretty easy.

First, make sure your pH meter is working perfectly (or use the new pH Perfect base nutrients
that automatically buffer and adjust pH to the ideal sweet spot). Flush your
plants (I prefer
Final Phase or Flora Kleen), dump your reservoir, fill with reverse osmosis
water, and feed with
quality hydroponics base nutrients. When I say “quality hydroponics
nutrients,” I mean a reliable
brand of hydroponics base nutrients other than the brand you were using when
the nutrients deficiency

You can also experiment with slight up and down adjustments of nutrients
strength (ppm) or nutrients
water pH and see if that corrects the problems. For example, many of us
follow the dosage instructions
on nutrients bottles and end up with 500+ ppm during flowering. In some cases,
that’s too much, and what’s
really strange is that using too much nutrients can result in nutrient deficiencies.

So try changing your dosage 50-100 ppm in either direction, and see if it makes a
Try adjusting you pH from 6.2 to 6.0. Different nutrients interact with root zone
material and
water differently, so that you might get absorption of 12 elements, but the pH is
wrong for three
other ones. Even small adjustments in pH (unless you’re using pH Perfect base
nutrients in which
case it doesn’t matter), can affect individual element’s absorption.

Wrote By
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She’s hungry. What do you have nutrients wise besides big bloom?
Even if run off ph is 7.1 that shouldn’t lock out nitrogen if that’s what it needs.
You could simply piss in a cup and mix that with water 10:1 water being the 10 parts and that will give her a boost of N in case you don’t have anything else available

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I was mistaken, I have FF Grow Big, and she’s gotten one dose of that. I’m surprised because this plant is only 6 weeks old and growing in FF Ocean Forest, I thought the soil would last a while as far as nutes go, maybe she’s an extra hungry one. I’ll try the Grow Big. Thanks!!

Looks like early signs of overwatering… :+1::wink::upside_down_face:

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This is my first grow and I’m growing auto purple kush. At first I was told I was overwatering her so I cut back but now the bottom leaves are turning a lot more yellow with brown tips and curling a little bit any advice on whats wrong with her and how to fix it?


Here are some better pictures of whats going on with my baby any help is appreciated

how old is she?She look really skinny,i would add some nutes!Also if she outdoor i would take her out,or if shes indoor i would give her more lights!Window seel will not cut!Judging by what i see from a window you live in USA.Dont know which state,but if your state alow to grow get her some lights!