12 12 light cycle from seed led weed grow video

Cannabis Time-Lapse Photography Videos

Today I would like to feature the following incredible marijuana growing time-lapse photography and videos, many of which were produced by fuzzygrow. View all of her time-lapse videos here: http://vimeo.com/user15676933/videos

A huge thanks to fuzzygrow for contributing these uniquely valuable time-lapse videos to the marijuana growing community!

New Life – The birth of a marijuana plant from seed

This time-lapse video spans 5 days, a frame was taken every 6 minutes. 24fps .

Watch two seeds sprout and grow their first two sets of leaves. The plant on the left is Super Lemon Haze and the one on the right is strain Tijuana.

Marijuana seeds first sprout two smooth “baby” leaves known as cotyledon leaves. These leaves were already formed in the shell. When the seed is put in warm wet conditions, the seeds “wake up” and the seed splits open. The white tip that first emerges becomes a root and grows downward.

The cotyledon leaves unfurl and start gaining height above the soil. You can see the first “true” (wrinkled) set of marijuana leaves nestled in between the cotyledons at first, and as time goes on these spread out to catch as much light as possible.

You may notice the young seedlings making slow circular movements. As far as we know, all plants do this while they grow and this movement is known as nutation, circumnutation, or nutational movement .

While we don’t fully understand the mechanism behind this movement, some scientists speculate that it was developed as a way for the plant to “explore” and find the best direction to grow, since even though plants are rooted, the difference of even a couple of inches can make a huge difference in the survival of the plants.

Recovery of Topped Marijuana Plant & Formation of 2 New Colas

This time-lapse video spans 7 days

In this video, a young marijuana plant is topped and you can watch as the two growth tips from the top node (quick picture cheat sheet explaining nodes & growth tips) turn into the two new main colas.

After the plant is topped, notice that not just the top two, but all the growth tips on the plant begin growing out (the plant is becoming more bushy). This is due to a hormonal response that happens in the plant when the main cola is damaged.

Watch as the two new main colas at the top get wider and taller, while their connection to the base of the trunk is strengthened and thickened to support their growth.

Young plant burned by Pyrethrum while lights are on & recovery

This time-lapse video spans 2 weeks, a frame was taken every 6 minutes. 30 fps.

This one is a little bit hard to watch as this Purple Haze seedling is hit by a strong insecticide (Doktor Doom) around 0:31 to combat spider mites.

The insecticide is sprayed while the lights are on, and unfortunately this combination of insecticide + light burns the young plant. You can see the plant struggles to recover for nearly the rest of the video.

I sprayed Dr. Doom on this young plant to try to combat spider mites. Plant is under a 42w CFL. The main apex was also burned which stopped growing but eventually a new one formed off center. New leaves sprouted just above the cotyledons as well.

Don’t spray pyrethrum-based products with any grow lights still on!

Pyrethrum is an ingredient in certain insecticides. In this case it came from Dr. Doom. Pyrethrum is very photoreactive so because it was sprayed with the lights on it created a bad situation on the plant as you can see. It almost appears to burn it. The growth was very gnarly for awhile afterwards!

You can see the extreme stress the Pyrethrum combined with grow lights has put on the young plant.

Although this plant recovers, you can see how badly the burns stunted its growth, and you’ll notice that the regrowth that follows is a bit odd as the plant “ditches” the burnt parts and then gets back into the swing of things.

Growing with ScrOG Time-Lapse

Watch as these young plants are trained to fill up a ScrOG net. ScrOG stands for “Screen Of Green” and refers to using a “screen” (usually made of string) to force plants to grow into a flat canopy.

Seedling & Vegetative Stage

The above time-lapse video spans 40 days of growth. A frame was taken every 6 minutes. 50fps .

Once the screen has been “filled out” with vegetative growth, the grower will switch to the flowering stage. The ScrOG technique is used to get better yields out of your indoor grow lights, which are most effective when plants are kept as close to the lights as possible. The ScrOG technique makes it so that when buds start forming, the lights shine directly on the buds and fatten them.

You just saw these plants fill up the ScrOG net in the last video. Now watch as the colas from these scrogged plants fatten up throughout the flowering stage until harvest time.

Flowering Stage

Why do marijuana plants seem to “breathe” in time-lapse photography? Why do the leaves begin to droop down and then suddenly spring back up?

All plants do that. It partly has to do with their Circadian rhythms. Plants must put energy into keeping cell walls rigid to hold up the leaves. Kinda like using their “muscles”. With plants like cannabis, the leaves tend to “rest” at night and “perk up” when they “think” the sun is going to come out.

The plants also wilt when they’re thirsty and perk up after being watered.

Here’s a timelapse showing a plant putting its leaves up and down in response to the light


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Bonus Marijuana Time Lapse Videos

These have been circulating around the internet for a while, but if you haven’t seen them before, you don’t want to miss these bonus marijuana time-lapse videos.

Growing Marijuana Time Lapse – 80 days in 45 seconds

Sweet And Sour Headband Marijuana Time Lapse Grow – seed to harvest

Seedling to Harvest – Marijuana plant grown naturally without any plant training

Cannabis Light Cycle Fundamentals: 24/0, 18/6 and 12/12

Which light cycle is best for vegetative growth, is an often-debated topic. Here we review the basics and explain why we prefer an 18/6 light cycle.

Cannabis Light Cycle Basics:

In the cannabis community, light cycles are expressed as a fraction with “Lights on” time over “Lights off” time.

  • 24/0: Lights are on 24 hours and off 0 hours
  • 18/6: Lights are on 18 hours and off 6 hours
  • 12/12: Lights are on 12 hours and off 12 hours. 12/12 timing is used during the flowering period with Photoperiod plants.

The light cycle is important because plants need light to photosynthesize. The more light we can give them, the better they are. With photoperiod plants, we are limited to only 12 hours of light during the flowering stage. However, there is confusion in the growing community about the duration of lighting that works best for vegetative growth for photoperiod and auto-flowering plants.

Understanding Basic Plant Processes

Plants use energy from light, to power their growth. Photosynthesis is really two basic processes, a light dependent cycle (the “photo” part of photosynthesis) and a light independent cycle, where carbohydrates are built (the “synthesis” part of photosynthesis). During the light dependent cycle, plants use light and water to create energy in the form of ATP and NADPH. This energy drives the synthesis of carbohydrates in the light independent cycle, which is often called the Calvin cycle. It is “light independent” because nothing within the Calvin cycle itself uses light energy directly. However, it relies on the energy created in the first half of the photosynthesis.

It is during this second stage that plants take carbon dioxide from the air and use it to create the ultimate product of photosynthesis, carbohydrates. Although they are called “light independent” the synthesis processes of photosynthesis only operate when they receive energy from the “light dependent” part of the cycle. This means that the synthesis of carbohydrates occurs only while the plant is receiving light.

Cannabis plants can be grown under continuous 24/0 lighting. They do not require a dark phase to perform their basic functions of growth during the vegetative stage. There are plants that only can absorb carbon dioxide at night and thus require a dark period to complete photosynthesis. However, Cannabis is a C3 plant, which means that it takes in carbon dioxide during the day and does not require a dark cycle to complete the photosynthesis cycle. That said, there is reason to believe that certain strains may benefit from a dark cycle. Furthermore, as we explain below, the benefits of 24/0 lighting are minor and may not be worth the additional costs for electricity.

18/6 For Vegetative Growth

Just thinking about photosynthesis and the Calvin cycle has led many growers to the conclusion that 24/0 lighting is best for vegetative growth. However, there are additional factors to consider. Like other living organisms, plants are governed by a circadian rhythm and a hormonal clock system that functions in sync with a light on, light off cycle. Research has shown that there are important connections between a plant’s internal clock and genetic expressions, which can play an important role in the overall health and performance of a plant. A massive review on continuous lighting studies has shown that some plants perform negatively while others perform positively when grown under 24/0 lighting.

The potential benefits of 24/0 lighting are somewhat faster vegetative growth. However, it comes at the expense of additional electricity. Because of diminishing returns, the growth realized during the “additional” light time may be less efficient. You are using 25% more electricity, but you may not realize 25% faster growth. Because of potential negative responses and less efficient returns from electricity, we recommend vegetating all cannabis plants under 18/6 lighting.

12/12 For Flowering

While cannabis plants do not require any darkness during the vegetative stage, many growers know that most cannabis plants do require a uninterrupted dark period to produce flowers. The dark period for flowering has nothing to do with photosynthesis or the ability of the plant to use light energy and make carbohydrates. Rather, the dark period needs during the flowering period are a result of photoperiodism.

Photoperiodism is an evolutionary characteristic which plants developed to be able to determine when the seasons change. There are many plants that respond to day-length or “photoperiod” and the most common response is the induction of flowering. In this way, plants are able to produce flowers at the optimal time of year and before a winter freeze.

Most cannabis plants are photoperiod, which means that they will only produce flowers when a certain duration of dark is received. They actually require a period of uninterrupted darkness to trigger the photoperiod response. In most cannabis plants, the dark period must be 12 hours or half of the total 24-hour cycle. This limits the amount of energy that can be provided to plants during the flowering cycle and is one of the advantages of auto-flowering plants.

Light Cycles for Auto-Flowering Plants

Auto-flowering plants are day-length neutral, which means that they do not depend on light or dark intervals for the induction of flowering. They are bred by crossing cannabis with a day neutral plant that has a fast flowering cycle, ruderalis. This means that longer light cycles can be used during flowering and therefore you can provide more total energy to the plant during the flowering cycle. Rather than reducing the lights to 12/12, you can continue to provide 18/6 lighting to auto-flowering plants throughout their life-cycle. You can increase your yields, but of course you also increase your electricity use, so it will also increase the expense of the grow. As a result, it is not more efficient in terms of returns to electricity, but auto-flowering plants may allow you to harvest more within a certain time-frame, which may be more important to some growers.