Category Archive : Growing Cannabis

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Damping off in cannabis crops: what is it and how to prevent it?

Few growers may have gotten rid of the so-called Damping Off , also called fungal wilt seedbed disease. It is quite common, from one moment to another we find our small seedlings lying on the substrate and with the stem bent. And in 90% of cases, the plant ends up dying.

It is a cryptogamic disease , that is, a plant disease that is caused by a fungus or any other parasitic filamentous organism. And not because of a specific fungus, but there can be several such as Botrytis, Phythium, Fusarium or Sclerotinia.

The spores of these fungi are generally found in all types of unsterilized substrate. Or it is enough that in a sterilized one, favorable conditions are met for its development, so that the spores invade it. Lack of ventilation, always flooded substrate, high temperatures and high humidity, are breeding grounds for all types of fungus.

Damping Off generally attacks seeds and young seedlings in their first days of life. And in the vast majority of cases in seedlings, it attacks the stem in the shallow area of ​​the substrate. With the vulnerability shown by the stem of a young plant, as we say, the plant in most cases ends up dying.


The seeds can be infected by any of the fungi that cause Damping Off. In this case it usually causes it to darken and soften, killing it even before it can germinate.

When it attacks seedlings, it produces a whitish spot on the stem at ground level. The fine stem thins, bends, and finally breaks, laying the seedling on the substrate.

By affecting the vascular vessels of the stem, the supply of nutrients and water decreases, later showing the leaves a flaccid appearance, as if they lacked irrigation.

How to avoid damping-off?

We have already seen which were the factors that most influence the appearance of this group of so lethal fungi. So we will try as much as possible to avoid them. For example, grow in well ventilated and not very shady areas.

Dark-colored pots should also be avoided outdoors, since they overheat in the sun and this temperature is transferred to the substrate. In addition, you should avoid watering in excess or doing it in the hours of sun or maximum daytime heat.

And with regard to the substrate, always use a preferably sterilized substrate. And if it is not possible, at least use a well composted substrate , since decomposing organic debris attracts many pathogens.

Can damping off be treated?

Being such an aggressive disease and that it attacks during short periods (germination and first days of the seedling), the possible treatments do not usually act in time. The best weapon will always be prevention.

It also spreads very quickly, so if several plants are grown, it is not surprising that they all have the same conditions. If it develops in one, let us fear for all the others.

It is convenient to discard the substrate of a plant attacked by Damping Off, as well as to disinfect the pot well before using it again

The Trichoderma fungus is very effective, widely used for the treatment of seeds and soil for the control of various diseases caused by pathogenic fungi.

indoor cannabis growroom

How to grow cannabis indoors according to genetics?

You could say that all cannabis strains can be grown indoors, but not all can be grown outdoors.

You could say that all cannabis strains can be grown indoors, but not all can be grown outdoors. In Atlantic climates, for example, long-flowering sativa varieties under normal conditions would have serious difficulties to finish their flowering in the months of November or December, since they are areas in which autumns are usually more like winters.

But indoors, certain varieties can be a headache for any grower, since we will struggle with a limited space in all its dimensions, mainly in height. But all this will be easier if you take into account some aspects.

Indic varieties and indic dominance hybrids

They are undoubtedly the most recommended varieties for indoors. They are usually compact growing plants and medium / low stretch. Genetics such as Northern Light, Hindu Kush, Black Domina, Super Skunk or Critical Mass are some of the most mythical varieties grown with artificial lights.

Whether starting from seed or cutting, it is very rare that they cause problems with their height or excessive growth. They are also the most appropriate for the high-performance SOG technique, although not so much for other techniques that require pruning or guidance such as SCROG or Main Lining.

They have a tendency to columnar growth and are not usually excessively branched. When starting from seed, around 4-5 weeks the plants can go to flowering, harvesting in another 7-9 weeks. The effects are mainly relaxing.

Sativa and hybrid varieties with indic / sativa dominance

They are at the other extreme, since they are undoubtedly the most complicated varieties and not recommended for beginning growers. In a short time after germination, they will show sometimes exaggerated growth. They are also highly branched plants, so an excess of plants per m2 can cause both height problems and competition between them. Haze, Amnesia, Kali Mist, AK47, Super Silver Haze or Jack Herer are great indoor classics.

Its cultivation is practically impossible if some cultivation technique is not used that limits vertical growth in exchange for promoting horizontal growth. Both SCROG, as Main Lining or Super Cropping, are the most used. Also the SOG when starting from cuttings, but taking into account that a small 10cm cutting can be transferred to flowering can exceed 50cm in the first weeks of this phase.

They are neither varieties for impatient nor for those who first of all seek production. Those with longer blooms can last up to 16 weeks just flowering, to which must be added about 5-6 weeks of growth since they also generally take longer to mature sexually than indica. In other words, in the duration of a 16-week flora cultivation of a sativa, 2 crops of a fast indica could be grown.

Indica / sativa hybrids

Indica / sativa hybrids are a middle ground. They are not as overgrown as sativas, nor are they as compact as indica. But you still have to take into account their growth, which is also usually fast and abundant. Varieties such as White Widow, Skunk or Chronic are preferred indoors.

They are suitable for both seed and cutting crops. They are usually adapted to any cultivation technique, having the same facility to concentrate the production in generous apicals in SOG cultures, or to branch and cover large cultivation spaces in SCROG or Main Lining cultures.

Flowering periods are usually around 8-9 weeks, being more typical of indica than sativas. The effects are also usually balanced, neither overly relaxing nor overly active.

Marijuana Growing Guide for Beginners - Part 1

Marijuana Growing Guide for Beginners – Part 1

The beginner’s guide to growing marijuana is simply a general review of the first steps and concepts you should learn to take in order to obtain a quality harvest without much effort, but above all without much knowledge on the subject.

We have created this post mainly thinking about people who would like to start growing, but don’t know very well where to start or what the steps are when it comes to growing. In this way and in a very simple way, everyone can learn to cultivate without being an expert in the field.

Now we are going to take the first steps, so take a pen and paper and make notes on the most important aspects.

Outdoor cultivation or indoor cultivation

The first choice you should make is the type of crop you are going to grow, indoor or outdoor seeds. Since this choice will directly condition the marijuana seed you must grow. In the market there are varieties designed specifically for indoor cultivation and the same goes for outdoor cultivation, which is why it is so important.

Marijuana seeds for indoor cultivation

The most recommended genetics for indoor cultivation are usually 100% Indica strains, hybrids with a high percentage of Indica or hybrids with a high percentage of Sativa developed for optimal indoor cultivation. Indica varieties are usually chosen, as they are the fastest flowering. Sativa varieties can be grown indoors, although it is necessary to have previous experience.

Outdoor Marijuana Seeds

The most recommended genetics for outdoor cultivation as a rule, are plants (regardless of the percentage of sativa / indica) of great resistance to attack by pests and fungi. Since in this type of crop plants are continuously exposed to the weather and any insect that passes through the area.

On the other hand you can also grow most of the genetics that exist on the market, although they have been developed specifically for indoor cultivation. In this type of crop can be grown sativa varieties without having the same disadvantages as indoors, but will have to arm themselves with patience, since the flowering period of these is usually more than 10 weeks. So they are usually ready for harvest from April.

What variety of marijuana to plant?

The second choice you should make is which variety of marijuana you want to grow, which will depend on your needs and where you are going to plant it. There are thousands of varieties of marijuana on the market and each one has different characteristics and a different way of growing it.

What variety of marijuana to plant?

In this aspect you can differentiate between, medical marijuana varieties and recreational marijuana varieties. Within these you can find auto-flowering plants, which flower automatically after a certain time of growth. And non-auto-flowering or photo-dependent plants, which flower when the number of hours they receive decreases with the arrival of autumn.

There are two versions of marijuana on the market that encompass all the others, we mean the regular marijuana varieties and the feminized marijuana varieties. Regular plants are characterized by producing both male and female plants. This fact can slow them down a lot in cultivation and lose valuable time for nothing. Feminized plants produce 99% female plants, so if you are looking for a variety to grow, the first thing you should choose is a feminized variety. This will save you time and money.

Marijuana Growing Guide for Beginners - Part 2

Marijuana Growing Guide for Beginners – Part 2

Indoor and outdoor marijuana varieties

To make it easier for you we are going to name several strains for indoor cultivation, which are quite easy to grow and need practically no care. For outdoor cultivation we will do the same, we will name several strains of easy cultivation and great resistance to adversity.

5 marijuana seeds for indoor cultivation

Sensi Seeds’ Skunk #1: one of the most cultivated, stable and hardy classics on the market.

S.A.D. by Sweet Seeds: a tasty, powerful and beautiful variety

Tutankhamun from Pyramid seeds: a very powerful, tasty variety that can withstand all types of pruning.

Kritical Bilbo by Genehtik: a fast, very productive, resistant and very tasty variety.

Nebula of Paradise Seeds: very cerebral variety, with typical flavor of sativa.

5 outdoor marijuana seeds – best outdoor marijuana seeds.

Sweet Seeds’ Jack 47: a productive, powerful, resistant and coveted variety.

Power Plant by Dutch Passion: very productive, great adaptability and great vigour.

OG Kush by Humboldt Seeds: a highly resistant, productive and legendary plant.

Super Silver Haze from Green House Seeds: ultra productive and very powerful variety.

LSD of Barney’s Farm: it is a strain of great resistance, aroma and production.

Marijuana Growing Guide for Beginners - Part 2

What substrate should you use?

The substrate should always be of the best possible quality, so try to avoid the use of mixtures of dubious origin or avoid buying in places where they are not specialized in this type of culture. This has to be in accordance with the climatic conditions of the area, because if you live in a place where rains are quite common, you should not grow with a substrate that retains too much humidity. For this reason it is important to study the area and see what it asks for. If you are going to grow indoors the options when choosing the type of substrate are extended, the only thing you should take into account is that it should be of good quality, the rest is a matter of taste.

Remember that if you are going to grow directly in a pot the most recommended is to use quality substrate, without mixing with clay soil. However, if you are growing in direct soil, to avoid making too large an investment in substrate, the best thing to do is to mix the substrate and soil from the same area at 50%. In later years, we can add 50% more quality substrate, this way the medium is improved and reconditioned for cultivation.

In this aspect it is necessary to take into account that the frequency and quantity of the irrigations will also depend on the area where it is cultivated. In rainy areas you will have to water much more carefully and be aware that the substrate more or less dries out in conditions. In temperate zones watering can be applied in a more relaxed way, you just have to make sure that the substrate has lost more than 60% humidity.

In dry areas it is just the opposite that in rainy areas, you will have to be careful that the substrate does not get too dry, because it is also counterproductive, if necessary you should water as many times as necessary as long as the substrate has lost more than 70% of humidity.

Damp climate 

If you live in an area where rainfall is quite common and the soil is often too wet or waterlogged, you need to work with a substrate rich in coconut fibre and perlite. These components help to oxygenate the mixture and maintain ideal conditions for the roots. You can also fill the bottom of the hole or the base of the pot with clean stones or arlita, these help to keep the base of the roots less waterlogged.

Temperate climate 

In this type of climate, practically any type of substrate can be selected as long as it is of good quality. In this case you only have to take into account the characteristics of the substrate itself and water progressively.

Dry climate 

In this type of climate it is necessary to use substrates enriched with materials that help retain moisture in the environment, such as vermiculite, worm humus and different types of polymers.

The time has come to germinate

Germination is a step prior to the actual start of cultivation, as everything else is just preparation. This moment is vital, so it is very important that the germination of the seed passes in an optimal way.