Trouble reading today's article? Click
here: Issue #254 - Sunday, February 26, 2017
Dear Fellow Grower,
In today's issue... - Learn 10 ways to cure cannabis plants with yellow leaves!
- Bonus! What causes curling or clawing leaves?
- Discover a few cases when yellow leaves are perfectly normal!
- Our Trophy Pic of the Week features two beautiful plants - one close to harvest, and
one just starting its flowering journey!
Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com) "My role models are people who can do things; I say to myself, 'I wish I could do that.'"
~Queen Rania of Jordan
10 Main Reasons for Yellow Leaves by Nebula Haze |
Are some or all of your cannabis leaves turning yellow? Maybe your leaves also have other symptoms like spots, curling, wilting,
brown patches and/or more. Marijuana plants may get yellowing leaves for several different reasons, so it can be hard to figure out the true root of the problem! Today I'll break down the 10 most common reasons your weed leaves turn yellow, and I'll show you how to make your plant green
again!
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10 Causes of Yellow Leaves (From Most to Least Common) 1.) PH is Too High or Low at the Roots
Whether you're growing in soil,
coco coir or in hydroponics, probably the most common reason to see yellowing and other nutrient deficiencies is the pH near the roots is too high or too low. Cannabis plants have a difficult time absorbing nutrients when the pH is off, resulting in nutrient deficiencies even if the nutrients are actually there near the roots.
Symptoms
- Yellow or other oddly colored leaves
- Spots, stripes or patches
- Burning around the edges of leaves
- In fact, basically any nutrient deficiency can be triggered by incorrect pH!
How Do Growers Get It?
Growers who don't make sure their pH stays in the right range will often run into nutrient deficiencies, even if they're starting with a pure source of water and good soil! - Soil Optimum: 6-7 pH
- Coco / Hydro Optimum: 5.5-6.5 pH
How to Fix These symptoms look like nutrient deficiencies, but are actually caused by incorrect pH! This is a deficiency, even though it looks a little like nutrient burn (too high levels of nutrients). The main clue is the yellow striping on the leaves. Another clue is the brown tips are going in further than typical nutrient burn. Stripes on the leaves (click for close-up) indicates that this isn't a Nitrogen deficiency, even though the symptoms are somewhat similar. In this case the symptoms were caused
by the pH being way too high.
2.) Poor Watering Practices
It's much more common to over-water than under-water cannabis plants, and the symptoms are very similar. Yet in either case the solution is to learn how to water your plants exactly the right amount at the right time!
Symptoms of
Poor Watering Practices
- Droopiness (it's normal for plants to droop a little before the lights go out, but you know the drooping is a problem if it's already happening at the beginning of their "day")
- Odd problems and symptoms from poor
water practices including yellowing and sometimes other deficiencies
- Overwatering - leaves seem "fat" and swollen with water. Often you'll have a feeling you may be overwatering your plant, especially if it's a small plant in a large
container
- Underwatering - leaves often seem "papery" and thin because they don't
have any water inside them. Chronic underwatering leads to overall yellowing and deficiencies.
How Do Growers Get It? - Overwatering is most common with young plants since they still have small, weak root systems
- You can hurt plants by giving too much or too little water at a time, and you can also cause persistent droopiness by watering too often or too infrequently
- Bad soil with poor drainage can cause the symptoms of overwatering even if you're watering the plants perfectly!
- Small plants in big containers are easily over-watered
- Big plants in small
containers are easily under-watered
- Growers who spend long periods away from their plants and/or don't pay attention to their watering needs are much more likely to run into problems with droopiness!
How to Water Your Plants Correctly
Overwatering
Chronic overwatering can sometimes cause unusual deficiencies even if the pH is spot on, like this plant grown in muddy
soil. The biggest sign that these symptoms are caused by overwatering and not pH (or something else) is that the plant is always droopy. Another example of a deficiency that's actually caused by overwatering (notice how this seedling is also droopy) Chronic Underwatering (Relatively Rare)
Bonus: Why Are Leaves Curling or Clawing? |
Some symptoms are really hard to diagnose, and curling or clawing leaves can be one of them!
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When Are Yellow Leaves Normal? |
Sometimes Yellow Leaves Are Normal!
Sometimes marijuana leaves turn yellow for totally normal reasons, including....
First Leaves Turn Yellow - Normal
After your plant has grown a few sets of leaves, it's very normal for the first few sets of leaves to turn yellow and die, especially if they're not getting light anymore. You will almost always lose the round cotyledons, the single-finger leaves, and the three-finger leaves (first three sets of leaves).
This vibrant young cannabis plant
is healthy and growing over an inch a day
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However if you look closely at the bottom of the plant, you can see the three bottom sets of leaves have turned yellow and are dying. This is normal! The plant does not hold onto these baby leaves for
long!
Single-Finger Leaves (plus the tiny round cotyledon leaves)
When just first 3 sets of leaves turning yellow like the example above (leaves with three fingers or less), it's not something to
worry about as long as the rest of the plant is green, healthy and growing fast!
You don't normally see these in pictures because most growers remove them :)
Plant is Ready to Harvest -
Normal
Often plants will have a few yellow leaves by harvest time! This is completely normal and nothing to worry about as long as you've ruled out bud rot! Mutation - Cosmetic (Usually Not Harmful)
Occasionally you may see mutations or natural
variation that results in parts of leaves being yellow. The general rule of thumb with any unusual leaf symptom is if the rest of the plant is green, vibrant and healthy, there's usually nothing to worry about.
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Subject: Thank you very much for being you
Message: You know better than anyone that the internet is
loaded with info about weed growing -- not all of it correct or easy to understand. Your site became my go-to for my very first grow. I practically followed every single bit of your advice.
Yesterday, I harvested 5 lbs 2 oz of wet weed from three plants (hydro, GH nutes, your sched). Now on to drying and
curing using your methods! i just wanted to let you know that people are listening. Thanks again. |
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GDP (clone only) on the left - 65 days flowering.
~426
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You Might Find the Following Links Helpful!
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Check Out Our New Grow Forum! |
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Ask Questions and Get Answers From Real Growers!
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We encourage you to forward this email to a friend in need!
Who Runs This
Newsletter? |
Nebula Haze:
I'll be honest with you, when I first started growing, I struggled. Now, it is my mission to make it easier for new growers to
get started as well as help advanced growers get bigger, better yields with less time and money. We are updating and adding articles every single week and our goal is to eventually build a comprehensive growing resource so anyone and everyone can grow if they want to! If we all share the knowledge there's more buds in the world for everyone :) |
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Learn which seed sources are personally recommended by Nebula Haze |
Sirius Fourside:
Sirius Fourside is a hobbyist grower who has gained the bulk of his experience growing in water as a medium (deep water culture,
bubbleponics).
"Growing cannabis is a relaxing hobby in and of itself, but it also saves you money and keeps you from having to deal with shady characters. Cannabis is much
easier to grow than people give it credit for, and growing in water doesn't increase the difficulty much, if any. But whether you want to grow in water, coco, or a different medium, we'll show you how easy it can be!"
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Safely! |
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