Trouble reading today's article? Click
here: Issue #273 - Sunday, July 9, 2017 Dear Fellow Grower,
In today's issue we offer resources for outdoor growers! - Learn what you can do to save your outdoor plants during a heat wave!
- Now that it's in the midst of the outdoor growing season in the northern hemisphere, I wanted to provide resources to help you identify and get rid of the most common cannabis pests!
- Check out the Trophy Pic of the Week featuring three
gorgeous outdoor cannabis plants!
Nebula Haze & Sirius Fourside (founders of GrowWeedEasy.com) "Raise your words, not voice. It is rain that grows flowers, not thunder."
~Jalaluddin Rumi
Save Your Plant During a Heat Wave! by Nebula Haze |
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Many outdoor growers are dealing with unusually high temperatures during their summer grows, and many of you have written in with pictures of outdoor cannabis plants that are wilting and drooping, with leaves that are twisting,
curling, flipping up at the edges, or otherwise getting majorly stressed by the heat.
Heat stressed cannabis plants tend to droop and wilt. The leaves often start cupping, like a little taco or canoe. Sometimes just the edges of leaves tip up. The ends of leaves may curl up or down. Heat-stressed plants can stop growing until conditions
improve.
Tips for Growing Cannabis Outdoors on Hot Summer Days
Luckily, there are some things you can do to protect your plant
and help it get through a heatwave (or just a long, unusually hot summer). Today I will share some tips for keeping outdoor marijuana plants healthy even when it gets hot outside!
Heat Stressed Leaves Look Unhappy Around the Edges
1.) Never Let Plants Dry Out!
This is one of the most important preventative measures you can
take! Make sure plants in high temperatures are always watered! Plants drink a lot in the heat and if they dry out they can die almost overnight. Having a good amount of water will help them be as healthy as possible.
Never let the growing medium completely dry out! It's important to keep a close eye as soil can dry out very quickly when it's hot, especially if it's also
windy or dry! 2.) Don't Let Plants Get Over-Watered
Conversely, it's easy for plants to get over-watered in the heat, because hot water
contains less oxygen. "Over-watering" and droopiness are actually the symptoms of the roots getting enough water but not enough oxygen.
Therefore, even though you don't want the plant to dry out, you also don't want to soak the soil every day or the plant roots won't get oxygen. Making sure that your soil has plenty of drainage (for example incorporating 30% perlite into your potting mix) will
help prevent symptoms of overwatering.
A loose, airy potting mix will help get plenty of oxygen to plant roots even when it's hot outside Also, when it comes to watering, try to avoid getting water on the leaves as the water droplets can act as tine magnifying glasses and cause leaf burn when the sun starts beaming down.
Tan Fabric Smart Pots (like the one below) are
light-colored to help reflect away heat, and the fabric container lets air in from the sides, helping provide oxygen and preventing the plant from getting overwatered. Just be aware that fabric pots dry out more quickly than standard hard-side containers, so make sure to either size up or water a bit more often!
3.) Take Advantage of Evaporative Cooling
Water your cannabis plants in the early morning if possible. As the water evaporates during the day, the power of evaporative cooling helps the roots and the area directly around the plant stay slightly cooler.
To enhance this effect, some growers will take a shallow but wide tray, fill it with something like pebbles or gravel, then fill it with water up until the top. Next, place the
plant container on top.
The gravel will hold the container up out of the water, preventing water from being sucked up by the roots through the bottom of the pot (which would cause overwatering), but as the sun evaporates the water puddle it causes the air directly around the plants to be a few degrees
cooler.
A "Plant Humidity Tray" is basically a tray full of gravel and then filled with water. Place the plant on top of the tray, and as the water evaporates it cools the air directly around the plant by a few
degrees. Every degree helps when the temperature gets really high!
4.) Keep Roots Cool
Plants with cool roots are more resistant to heat. If growing in a container, keep roots cooler by putting some sort of barrier between the sun and the outside of your pot. For example, place the main container inside another, larger container. Another idea is to dig a
hole in the ground and place the whole plant container inside. These strategies protect the sides of the pot from being baked in direct sunlight. Don't let plants in containers sit directly on ceramic tiles, or other materials that tend to heat up a lot under the sun. It can also help to have plants in a bigger container altogether, because the extra soil also acts as a buffer for the roots.
Put your main pot inside a bigger container to protect roots from baking in direct sunlight. Some growers also recommend adding a layer of light-colored mulch (like straw or dried grass clippings) on top of the soil. The
light color helps reflect heat back. I personally caution against bark-based mulch for first-time growers, especially those using liquid nutrients (which are very sensitive to pH), because bark can affect pH as it decomposes.
5.) Offer Shade
When the plant is under direct sunlight and the heat gets out of control, try to move plant indoors or offer shade if possible. Some growers will erect a "mesh shade net" over the top of their plants during the hottest days of summer, if a shadier spot is unavailable.
It's easy to move plants in containers, but even if plants are in the ground you can offer shade. Erect a frame around them so they're getting full sunlight most of the time, but when it gets really hot you can throw a shade net over the top to give them partial shade without reducing airflow. Planting cannabis in groups can help offer a little shade from the sides, compared to one plant by itself in an open field. Whatever you do, make sure plant is not put in the dark during their day period! It should still be getting some amount of light,
even if it's just a sunny window or a single light bulb. If you mess up the plant's circadian rhythms by keeping them in the dark during their normal day period, it can stress them out further.
6.) Breezy Spot If Possible
If the plant can be moved somewhere slightly breezy (the leaves or stems shouldn't be waving around, but a gentle leaf rustling is good), that is better than sitting in stagnant air. Sometimes different parts of your yard or grow area are more suitable than others, so it can help to think about whether a slightly different placement may be better for your plant.
That being said, don't leave cannabis plants totally exposed or put them somewhere they'll get beat up by the wind!
This is on the side of a hill, which is relatively breezy
while still getting a lot of sun. The surrounding plants help shield the plant from strong winds as well as offer some protection and shade. Plants that are grouped together often perform better than a single plant scorching in the sun by itself. It can help to move plants around and see if they perform better in some places than others.
(Plus find out why coco coir may be better than soil for hot environments, and learn
about heat-resistant strains!)
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We are in the middle of the outdoor growing season in the northern hemisphere, and outdoor growers are just starting to get hit by bugs!
I wanted to share the most common cannabis bugs with you, and if
you don't see yours please reply to this email with pics and we'll see what we can do!
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Subject: Manifold Tutorial....I am doing it!!!
Message: This morning was a banner day for me, and I would be lying if I did not share that after I had cut my 2 girls down to their 3rd. node and trimmed all vegetation below, in my head I was repeating "God bless Nebula Haze". I am in my
second grow, using my beta version of the Cloudponics growing machine. My first harvest was a raging success, and I yielded 3 1/2 oz. of superb quality "God Bud". I am friends with the owner of Cloudponics, and he suggested your tutorial for me, and while I can't say exactly how this will all pan out for me, at this moment, I am on top of the world from
what I have begun. Your writing of the tutorial has upped my faith in folks, because your sharing has affected me deeply. I am most sincerely yours, Jeff |
Trophy Pictures of the Week! |
From left to right: GSC, Skywalker Kush and Gorilla Glue #4
~R |
We encourage you to forward this email to a friend in need!
Check Out Our Growing Community! |
Check out our friendly growing community to ask questions, discuss your grow, share pictures, or otherwise talk about growing cannabis with other real growers!
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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 can be 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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