[GWE] Common Seedling Problems

Published: Sun, 08/17/14

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Issue #122 - Sunday, August 17, 2014

Dear Fellow Grower,

In today's issue...

  • Learn how to avoid the most common seedling problems!
  • Ready to grow your own seedlings? Learn the secrets of germination!
  • Check out an awesome trophy pic featuring two Bubba Kush plants!

Happy Growing!

Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com)

"Your time is limited, so don't waste it living someone else's life."

~ Steve Jobs

Common Seedling Problems
by Nebula Haze

Before we take a look at cannabis seedling problems, let's show you what a healthy cannabis seedling looks like! If your plants look like this, you're golden!

Healthy Cannabis Seedlings Look Like This!

One last thing before we get into seedling problems; let's take a look at what healthy seedlings and young plants look like!

Examples of healthy cannabis seedlings
Cannabis seedlings start with two round leaves known as "cotyledons." These leaves are already formed inside the seed and simply open up once the seed has sprouted. After the cotyledons emerge, the "true" (serrated) cannabis leaves will start to grow from the center.
As they get older, the leaves start looking more like the cannabis leaf you are probably most familiar with. Here's what those seedlings look like as they start growing into healthy young cannabis plants..
Now that you know what healthy cannabis plants look like; let's take a look at some common seedling problems to avoid so your plants grow as fast and healthy as possible!
Common Cannabis Seedling Problems

1.) Overwatering - seedling is droopy, growing medium is moist, damping off

When a cannabis plant is "overwatered" it has less to do with the water and more to do with oxygen. Plants can even grow directly in water (hydroponics) but in order to thrive, roots need oxygen. In hydroponics, that's accomplished by dissolving oxygen into the water. But when plants are grown in a container, too much water = not enough oxygen.

When a plant's roots are sitting in water, they quickly use up all the oxygen until the growing medium starts to dry out. Without enough oxygen at the roots, the plant will start showing symptoms. Luckily, there are many steps you can take to prevent overwatering your cannabis plants.

While overwatering can display many different symptoms, most overwatered cannabis plants look droopy, like this...

There's are many different causes of overwatering, and I will cover some of the most common ones here!

2.) Underwatering - seedling is droopy, wilting, or not growing properly, and the growing medium around the seedling isn't moist

While overwatering is the most common seedling symptom, underwatering is also a problem, especially for those who have been warned to avoid giving too much water.

It can be confusing because the symptoms often look similar to each other, which is why it's important to learn good watering practices

This seedling was underwatered - the grower had been warned many times to avoid overwatering, and went too far in the other direction. Notice that the growing medium looks bone dry.

It's crucially important to make sure that plant roots have access to moisture at all times. Plants are constantly losing water through their leaves (called "transpiration") and this is actually how plants get water up from the roots. As the plants lose water from the leaves, it pulls water up from the ground like a straw. 

When there's not enough water at the roots, many plant processes cease to function. If roots actually dry out, the dried shoots die.

Here's another example of a young cannabis plant that is underwatered, even in a big container (where the problem is usually overwatering). Notice how this cannabis seedling is basically just wilting and falling over, while the potting mix looks completely dry.

3.) Nutrient Problems - leaves are yellow, discolored, crispy or have spots

Healthy cannabis leaves on seedlings should be green! Again, here's what healthy leaves look like...

Healthy Leaves Look Like This

When the cannabis leaves of young plants stop being green, you need to react. Changes of color (such as yellowing, spots, burnt tips, etc) are usually a sign that there's a problem when it comes to young cannabis plants.

The leaves of young cannabis plants & seedlings should be green!

Some common seedling nutrient problems include...

4.) Heat - leaves bend in the middle so they look like canoes or tacos, turning up at the edges, wilting, strange spotting, symptoms usually appear after temperature starts climbing

When the heat gets too high, the edges of the leaves will begin to curl up and the leaves will begin to "cup" or "taco." 

Here's another cannabis seedling suffering from heat stress - notice how the edges are curling upwards. The solution to this problem is simply to lower the heat as experienced by the plant.

5.) Not enough (or too much) light - burned or crinkled leaves, too much space between nodes, tall seedlings that fall over


Not Enough Light = Stretched, "Leggy," Tall Seedlings

Too Much Light = Burned, Crinkled Leaves

Stretched, "Leggy," Tall Seedlings - Give More Light!
Burned, Crinkled Leaves - Reduce Light or Move Grow Lights Up
This cannabis seedling basically grew up into the grow light!
This cannabis seedling is being burned by too-close LED grow lights
Who Runs This Newsletter?
Nebula Haze:

As an epilepsy patient, medical cannabis is important to me, and I'm dedicated to showing others how easy it is to grow their own supply of cannabis at home.

It is my mission to educate and build growing resources to help both new and advanced growers get bigger, better yields with less time and money.
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, perlite, or a different medium, we'll show you how easy it can be!"
How Can You Avoid Germination Problems?

Before you can worry about cannabis seedling problems, it's important to get your cannabis seeds to sprout!

Most importantly, just remember that cannabis seeds like a warmmoist environment to sprout.

As long as you provide the right conditions, you can achieve nearly 100% germination rates!

Common Germination problems
  • Too wet - don't drown your seeds! While it's okay to soak seeds for the first 24 hours, after that they should be moist but not soaking.
  • Too dry - if seeds are too dry, they won't sprout! If seeds sprout but then are exposed to dryness, they will die.
  • Too deep - if you plant seeds too deep in the growing medium, they may have a hard time making it to the surface. An inch deep (just enough to support the seed and cover it) is about as deep as you'll ever need to go.
  • Not warm enough - seeds and seedlings like warmer temps (from 80-85 F) and will grow more slowly in cooler environments.
  • Wrong starting growing medium - Many growers like to plant their seeds directly in a growing medium, just like in nature. But some growing mediums are better for seeds than others. Learn the pros and cons of different growing mediums for starting seeds 
  • Old or improperly stored seeds - any seeds that germinates is a good seeds, but older or improperly stored seeds often take longer to sprout, and may no sprout at all, even if you do everything right.
  • Not ripe seeds (pale or translucent) - while any seed that sprouts is a good seed, seeds that are pale, flimsy or translucent have very low germination rates because they're not fully mature.
  • Too much humidity - Some growers like to use a humidity dome for new seedlings, but don't leaves these on too long after sprouting, as too much humidity can cause "damping off (seedling sort of folding over and dying, more info below)

 

Learn more about germinating cannabis seeds!

http://www.growweedeasy.com/germinate


Trophy Pictures of the Week!

Pics by "Mo Mack's"

"My two Bubba Kush babies! First time grow, 600w mh, 2x4 grow tent."
Look Who's Talking!

"Thanks again for all your efforts Nebula Haze... you have saved me countless hours of research time..."

-anonymous

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