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CategoriesAnalysis/Opinion, Guides, Science by

Light and How Cannabis Consumes It

In the eons before dinosaurs, plants dined on light.

During the early formation of our planet, there was no oxygen to breath, only water and light. This paradise of water and photons gave rise to the first plants. Not like the orchids and redwoods we are accustomed to today, early plants were mostly algae in the early oceans. These early plants developed a way to transform light into food.
By using sunlight to convert light energy into chemical energy, plants were able to store it for later use. Although photosynthesis is performed differently by different species, the process always begins when energy from light is absorbed by proteins called reaction centers that contain green chlorophyll pigments.
In plants like cannabis, these proteins are held inside organelles called chloroplasts, which are most abundant in leaf cells. In the light-dependent reactions, one molecule of the pigment chlorophyll absorbs one photon and loses one electron. This electron is passed to a modified form of chlorophyll called pheophytin and the process propels a chain reaction of life.
cannabis lights

Plants can use light from across the visible spectrum for photosynthesis.

Yet some wavelengths of light are more useful to a plant than others. Wavelengths that the plant uses a lot of get absorbed into its leaves and stem while wavelengths they don’t use get reflected back. We only see plants as green because they don’t use green light energy. They reflect the one color they don’t photosynthesize so we perceive them as green.
Because of how plants evolved their ability to photosynthesize, different wavelengths are needed in greater amounts at certain stages of a plant’s growth, such as the blue and red. Light high in the blue range enhances vegetative growth, while red light strongly influences flowering and fruiting.
What we perceive as visible light is comprised of seven main colors. All the odd colors we see like pinks, browns, and beiges are just mixtures of other colors. Our eyes can only register wavelengths of light are within the 400 to 700nm range. Below 400nm, we move towards ultra violet, x-ray and finally gamma rays. Above 700nm is infra red, then microwave and finally radio waves.

Let’s start with some measurements.

Nanometres (nm) are a measurement of light waves. Each degree in Kelvin (°K) rates the ‘temperature’ of a light and offers an indication to the peak nanometers (nm) or color within the spectrum. The lower the nm, the more blue the light appears while higher numbers look red.
Marijuana uses light from approximately 420nm through to 750nm. But what does that mean? To understand the unique diet of cannabis (and make those real yield gains) we need to create the ideal environment for the plants.
Giving them just any light simply won’t do if the goal is heavy crops (and who doesn’t want that?). Normal incandescent bulbs produce more high energy wavelengths like infra red (heat) and midrange light (550-650nm) than anything else. Anyone who has tried to grow a plant in a room lit only by incandescent bulbs can attest to their poor performance so avoid trying to grow with them.

Even light in the right wavelength may not have the right amount of lumens.

Cannabis need light from the right part of the spectrum with the right amount of intensity to encourage proper yet fast growth. Marijuana evolved to grow under sunlight which changes intensity over the seasons. Young weed plants can be easily burned if put under the same intensity of light as a mature ones.
For this reason, many cultivators use different lighting techniques for the different stages of plant growth. Fluorescent lights produce the right wavelengths for growth but lack the intensity of other lighting options making them the standard for use with seedlings and young clones. HPS (High Pressure Sodium) and MH(Metal Halide) are industry standard lighting options that are used during vegetative and flowering stages although LED (Light Emitting Diode) are quickly establishing themselves as premium lights in the market.
HPS light

There are a few different types of light.

HPS lights offer light from approximately 540 through to 700 nm, typically yellow, amber and red light so they are great for flowering/budding marijuana. These lights tend to burn hot and need to be ventilated as well as hung from a decent distance from the plants. This makes having a tall area to grow in a priority. Luckily, the light produced by HPS lights penetrates deeply into thick canopies which is perfect for the flowering stage when buds and leaves are competing for room.
MH lights offer light from approximately 350 to 550 nm in the blue, green to yellow range.  However exact levels depend on what lamp your purchase as some lamps are ‘cooler’ and others a bit ‘warmer’ than average. MH lights are good for the vegetative stage but not as much for the flowering/bud stage.

Lighting is going high tech.

LED grow lights can have a mix of LED diodes in a single ballast or specialized ones. This gives cultivators one more variable to work with but it also opens up a whole world of adjustment. With the increased lifespan of diodes over bulbs, reduced energy consumption and lower heat production, it is easy to see why cultivators are switching to LED.
While LEDs are far more efficient then HPS or MH lights (with almost 30% savings reported on average) they come with a significantly higher initial price tag. Small projects and weekend cultivators may not want to shell out the cash needed to obtain a quality growing LED but commercial outfits normally opt to go with the reduced energy consumption and quickly make back the difference in initial price.
LEDs also have the benefit of not needing specialized heat venting as they produce almost no heat.  While HPS and MH lights require ducting, fans and additional controllers, LED lights don’t need any of that while providing a dynamic mix of color temperatures. The best LEDs are full spectrum and use some blues, some reds and a very stable white to create broad (full) spectrum LED grow light. These are the new breed of grow light and cover the full light range from around 420 through 750 nm.

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CategoriesAnalysis/Opinion, Culture, Science, Strain Reviews by

Landrace Strains: Discover the Power

There has been a lot of talk about Landrace (LR) strains over the last few years. From Acapulco Gold to Malawi, people across the world claim to have landrace variants of many popular strains. These cultivators claim that their genetics are some of the oldest known to man. They take pride in the native, indigenous or heirloom nature of the cannabis strains under their care.
As humanities scientific understanding continues to grow, we have found that CBD may be better for treating pain and muscle spasms than THC. Without access to strains that had not been selectively bred, people would not have been able to create strains like Charlotte’s Web or LSD. Breeders needed to combine plants with new characteristics than what the market had available so they turned to the untapped potential of landrace strains.

What is a Landrace Strain?

Landrace Strain 1
A landrace strain never been crossed with a different phenotype and has grown in its natural environment for as long as people can tell. Like the Giant Tortoises of the Galapagos Islands, these plants have spent a long time in genetic isolation. Cultivators have taken the best of each generation and bred it with the next for many human lifetimes.
This isolation (and the resulting ) makes these varieties highly stable and extremely vigorous since only the best were kept. Over generations, people grew the plants that performed best for their environment. In the jungles of Durban South Africa, the plants needed to be able to grow above the trees so only tall plants grew well enough to survive.

Where Did Landrace Strains Come From?

Historical records (some dating as far back as 2900 B.C.) tell us cannabis has lived with humanity for thousands of years. Cultivated for food, fiber, and for religious and medicinal purposes, cannabis is one of the oldest known agricultural plants and has many uses.  According to the best available research, cannabis originally evolved in Central Asia and spread to nearly every region of the planet thanks to humans.
Outside of Asia, landrace strains are the result of escaped cultivars (strains that were selectively bred by humans) which gradually adapted to their environment over time. Over the centuries, other cultivars would have interbred with these feral escapees.  Due to the complex nature of the winds and plant/animal interactions, even the wild plants native to Central Asia are not believed to be untouched indigenous strains.

 Why Are Landrace Strains Important?


Not all cannabis is created equal in the eyes of growers. Plants that produce large colas full of cannabinoids like THC are traditionally prized over low yielding variants. Over generations, certain traits get bred out of or in to the genetic lines. People use this to make bigger and stronger plants than could be obtained otherwise.
This breeding method also has the effect of removing many of the less understood compounds. Since the same trichomes produce THC and CBD (and only one is psychoactive) growers selectively bred out the ability to produce CBD. That way all of the trichomes could focus on producing THC instead of some deciding to make CBD.

Where Are the Real Landrace Strains?


In today’s cannabis market people rarely see the pure landrace strains. On sites like Leafly and Cannafo, most of the sativas (the red tiled ones) are not pure sativas. Instead, they are sativa-dominant hybrids that exhibit strong sativa-like attributes. Same thing goes for indicas and hybrids. Landrace strains also exhibit these hybrid traits but to different degrees.
Landrace strains were embraced worldwide during the 1960s and 70s by growers who began collecting them in their own local gardens. Once the landrace strains were removed from their local growing environment, they became heirloom variants. For marketing reasons, most breeders don’t differentiate between landrace and heirloom.
These heirloom strains were then propagated in places like Hawaii and California. As the landrace movement grew, people who hunt for these hard to find strains became sought after. People like Arjan Roskam, founder of Amsterdam-based Greenhouse Seeds, and his colleague Franco Loja have spent millions obtaining these landrace varieties for use in their selective breeding.

What Landrace Strains Are There?

Here is a short list of some popular landrace strains:
Malawi Gold:
landrace 2Malawi Gold originated in Southeastern Africa. Grown on the shores of Lake Malawi (the third largest lake in Africa) the plant was adaptable to its local conditions. It’s genetic flexibility was perfect for the wildly changing environment which is why many phenotypes can be found in the market today. Aromas and flavors given off by the phenotypes of Malawi Gold help differentiate between the varieties. Two main phenotypes exist. One gives off a fruity smell while the other is a woody one. The fruity plants are normally smaller than the woody ones.
Afghan Kush Indica:
The plant is medium height with dark, broad leaves which makes it perfect for growing in the northern Afghani mountains. Its heavy, sweet aroma and taste mix with spices and incense to create a deep flavor. New smokers often find that this strain gives a very potent high that easily turns sedating. Perfect for people that are having trouble sleeping.
Hindu Kush Indica:
Cultivated in the Hindu Kush Mountain range for generations where it grows wild, the flowers of the fertile hillsides and valleys make the world’s finest hash. Years of selective breeding for resinous, indica-dominant plants with feral varieties have resulted in short, stocky bushes covered with huge, shiny trichomes. Known to relieve symptoms of pain, nausea, and stress while providing a pleasantly strong, earthy scent.
Lambs Bread Sativa:
Also called “Lamb’s Breath” Lamb’s Bread produces a bright green and sticky flower with a sativa dominant high. The effects have been known to help generate energy and positive introspection. Stress melts away under the warmth of the Lamb’s Bread buzz. This plant comes from Jamaica and it has been reported that Bob Marley himself enjoyed it.
There are literally tens of thousands of strains across the globe with a small percentage of them being landrace varieties. Because of the geographical nature of the landrace title, most strains retain the name of the area where they originated. Yet some places have made more of a name for themselves than others and it can be far easier to obtain their seeds or clones