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Summary

Magnesium is a vital element for humans, plants and animals. Among other things it is a building block for chlorophyll in plants so it is essential for photosynthesis and it also plays an important role in a number of metabolic processes. Magnesium compounds have been used since antiquity in medicine for heartburn, against poisoning and as a laxative. Magnesium powder is used on equipment for gymnastic exercises because it makes the hands rough and absorbs moisture. Magnesium is a very light, malleable, elastic metal with a silver-white sheen that burns with a blinding light in the air. It is one of the most common elements on earth and the earth’s crust contains approx. 2.09% magnesium, but only in compound form. Magnesium compounds are frequently found in seawater, salt deposits, water from salt lakes and in some mineral waters. It is also present in tap water and, together with calcium, is responsible for the hardness of water. Inorganic, magnesium fertilizers are prepared from the same salts as are used when preparing potassium fertilizers. When grown from seeds cannabis don’t need extra nutrients for the first two weeks.

• There are no visible symptoms in the first 3 – 4 weeks, the plant continues to grow well, is dark green and looks healthy.

• The deficiency symptoms first become visible in cannabis after 4 – 6 weeks when small, rust brown necrotic spots and/or cloud-like chlorosis appear under the flowering top on the middle-aged leaves. The color of the young leaves and the development of the flowers remains normal.

• The size and number of the rust brown spots increases on the leaves while the chlorosis also spreads and becomes yellower.

• The symptoms spread throughout the plant which will now look a sorry sight.

• If it is a serious deficiency the young leaves will also become chlorotic and production will fall.

Developments in chronological order:

Symptoms

Magnesium is mobile in the marijuana plant so if there is a deficiency, the chloroplasts in the middle-aged leaves that are below the flowering top are broken down and the magnesium is transported to the young parts. This process of breaking down the chlorophyll is manifested in the rust brown spots and/or vague, cloud-like chlorotic spots between the veins. It is more difficult to extract magnesium from the older leaves because the magnesium is an intrinsic part of the organic material. A minor magnesium deficiency has little effect on flowering despite the fact that the formation of flowers makes the magnesium deficiency symptoms worse.

Development

• There are no visible symptoms in the first 3 – 4 weeks, the plant continues to grow well, is dark green and looks healthy.
  

  

• The deficiency symptoms first become visible in cannabis after 4 – 6 weeks when small, rust brown necrotic spots and/or cloud-like chlorosis appear under the flowering top on the middle-aged leaves. The colour of the young leaves and the development of the flowers is still normal.

• The size and number of the rust brown spots increases on the leaves while the chlorosis also increases and becomes yellower.

• The symptoms spread throughout the plant which will now look a sorry sight.

• If it is a serious deficiency the young leaves will also become chlorotic and production will fall.

Possible causes

Magnesium deficiencies in cannabis occur more often relative to other deficiencies. Magnesium deficiency in the root environment can also occur when magnesium levels are normal or high as well as when there is a deficiency. This is because absorption can be slowed down by all sorts of circumstances.

Some of these are:

• A very wet, cold and/or acidic root environment.

• High levels of potassium, ammonium and/or calcium (for example a lot of lime in the tap water or lime rich, clay ground) compared with the magnesium levels.

• Limited root system and a heavy load on the plants.

• High EC in the medium, inhibited evaporation.

What should you do?

• Use fertilizers that contain magnesium as a preventative measure and spray with Epsom salts as a curative measure.

• Check the temperature, humidity, EC and pH in the soil or substrate.

• Go to the shop for expert advice. They specialize in this crop and have the right products available. Correctly formulated fertilizer contains sufficient magnesium.

• If it has been established that there is a deficiency you should spray with a 2% solution of Epsom salts.

Fertilizing via the roots: Inorganic: Epsom salts on hydro, kieserite on soil. Organic: old, rotten stable or turkey manure.

• Correct possible causes: If the pH is too low (< 5) when cultivating in soil use turkey manure which contains magnesium. With hydro cultivation temporarily drip feed the nutrient solution at a higher pH of 6.5. If the EC is too high rinse and/or drip feed with just tap water temporarily. When cultivating inside keep the root temperature above 19 ?C (20-25 ?C).

A little extra magnesium won’t do any harm and excess magnesium doesn’t occur very often when cultivating with soil. If there is too much magnesium, calcium absorption will slow down and it will look like there is too much salt because growth will slow down and the crop will turn dark green.

This video explains in detail how to build your own growroom and how to grow first class cannabis in the comfort of your own home. The video covers everything you need to know about growing weed indoors – from the materials needed to build your growroom to the appropriate humidity level and amount of water needed per marijuana plant. If you are planning to grow your medicinal weed at home this video is a must see!

Richard Friar, a 66-year-old farmer from Australia, and his wife Wendy are the proud owners of Australia&acute;s first licensed industrial hemp crop to be grown in an urban area.

With permission from the Department of Primary Industries, they are in the first stages of a pilot project aimed at teaching farmers how to grow hemp and commercialise its countless byproducts.

The Friars are hemp evangelists, firm believers in the world-changing potential of this most versatile of plants, which can be used in everything from food to fabrics and building materials.

With permission from the Department of Primary Industries, they are in the first stages of a pilot project aimed at teaching farmers how to grow hemp and commercialise its myriad byproducts.

The Friars’ crop, a mix of Chinese cultivars known as Yellow River and Lulu, is a fine example: the stalks can be used in the textile and construction industries – “they even use it, instead of steel, to reinforce concrete” – while the seeds can be eaten.

In December the couple applied to Food Standards for permission to sell the seed for human consumption, with approval expected early next year.

“They are a real superfood,” Wendy says. “It’s 23 per cent protein, and has more Omega 3 and Omega 6 than virtually any other source, including fish.

”In the early 1800s, Australia was twice saved from famine by eating virtually nothing but hemp seed for protein and hemp leaves for roughage.”

But the couple also plan to become brokers for hemp products, importing seeds and matching overseas and local producers with those undertaking retail or construction projects.

“We want to kickstart consumer demand,” Wendy explains. “It’s hard, though, because hemp has for so long been vilified as a dangerous drug.”

A film-maker, farmer, former horse trainer and grade rugby union player, Mr Friar has long been interested in permaculture and recycling; his company King Poo was one of the first to sell worm farms in the early 1990s. But it is hemp that has him raving.

“As a grandfather several times over, I am championing this now as the answer to a lot of our sustainability problems. We just have to lose the baggage we have about hemp, and approach it in a more mature way.”

Given the above data it can take anywhere between 10 weeks and 36 weeks for a plant to grow to maturity. That is, again, anywhere between 2.5 months to 9 months. The most common grow time is 3 to 4 months. All this is dependent on the strain that you choose. Pure Sativa can run anywhere into the 6 -9 month bracket. Indica can flower in 6 weeks. As you can image a Sativa/Indica plant will fall into the 2 -4 month flowering period.

As you know plant would grow in three main stages. Germination, Vegetative growth and flowering. Plants actually grow in 6 stages. Here is the life cycle of the cannabis plant. Read the rest of this entry »

cannabinoids. Photograph by Joop Jumas.

Female plants produce resin glands (Figure 1.12 and 1.14). Some of these glands may have lots of resin but are not very potent. Other plants may have little resin but are very potent. Optimal growth gives rise to a plant that has lots of resin and is very potent. Resin glands are produced all over the female flowers and new leaves. They can be seen clearly with the use of a magnifying aid. These resin glands are correctly called Trichomes. Read the rest of this entry »

The purpose of this post is to explain a few simple things that you must know to grow cannabis. We don’t pretend to be exhaustive, we wanna just avoid to the novices (and there are a lot) the most common errors. After all, our success depends by yours. If you have already grown cannabis before, and had success, you can still read this page but its utility will be limited. If you are an expert, please understand that we have to compress information in one page, and this means that sometime the accuracy had to become simplicity. Read the rest of this entry »