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The Six Things You Need To Do For A Successful Harvest

The Six Things You Need To Do For A Successful Harvest, Everyone knows that the quantity and quality of a crop is influenced by many factors that the grower needs to worry about. There are several ways to achieve the required conditions. The goal remains the same. Everyone can select their cultivation medium, the irrigation system, the fertilizer, the ventilation, etc. themselves.

The Six Things You Need To Do For A Successful Harvest
The Six Things You Need To Do For A Successful Harvest


Often, among the growers it is discussed which cultivation system is the best, how to irrigate properly, when, how much and which nutrients have to be added etc. One might think that anyone who has already a few years of breeding behind it has its own Approaches, ie: good practice.

For a successful harvest it is not important which cultivation system is used or to what extent everything is automated. Certainly, modern, specialized grow systems and automated systems can make things easier. But the following six points are, in my opinion, worth paying extra attention to:

The Six Things You Need To Do For A Successful Harvest

1: Good Cannabis Genetics.

Most Grower know both success and failure. It is not uncommon for everything to be going well for a long time, and suddenly, under the same conditions, a problem occurs. Many growers would now begins to look for an error in the system, whilst often the problem lies somewhere else.

Good Cannabis Genetics
Good Cannabis Genetics


Each seed and cutting contains hidden genetic information, which is responsible for plant development. If this information is incomplete or damaged, a good harvest will not be achieved no matter what care you give them. The genetic information contained in each seed or plant determines its predisposition. It’s just like people, most of us have four limbs and a head. This does not mean that we are all great swimmers. If we are not genetically predisposed to doing so, then even 20 hours of daily training can not make an Olympic swimmer out of us.

Getting a plant with good genes is not easy. The potential for a good healthy plant which ultimately will give us a great harvest can not be recognized with the naked eye. Of course, some genetic abnormalities can be recognized at a glance, such as a distorted leaf structure, dwarfism, weak roots, etc.

However, this only applies to cuttings. In the case of seeds, we are limited to visually looking for immature, damaged or strangely shaped seeds. But this has nothing to do with genetics. The most reliable way to obtain the required genetic predisposition we want is by careful selection, unfortunately for us as growers the high price of seeds has seen many new “breeders” who are only interested in making a quick buck.

High-quality genes are the first, fundamental and irreplaceable pillar of a successful harvest, please don’t waste your money on the latest fad, go to well established seed banks and breeders , it will make your job as a grower much easier!.

2: Cannabis Irrigation.

cannabis irrigation
cannabis irrigation

One common difficulty with cultivation is the correct irrigation. Here, by far, the most mistakes are made. The reason for this is simple: there is no universal guidance on how often and in what quantities water should be used.

Proper irrigation is dependent on many factors that are different in each installation space and grow cycle. How often and how much depends on the following factors: the cultivation medium used, the size of the grow containers, the plant size, the temperature in the grow medium, the relative humidity, the air temperature and ventilation.


Irrigation is influenced by so many factors that it is difficult to find grow rooms in which all parameters are ideal. If the cultivation medium contains too much moisture, the roots can not absorb enough oxygen and die. At the same time, optimal conditions for mold formation are created, and the roots start to rot. Too little moisture, on the other hand, means too little nutrient which can be added to the plant and the drying out of the plant, which consists largely of water. Unfortunately for the novice grower, the correct amount to water lies somewhere between too much and too little.

cannabis irrigationIt is always easier to correct under watering than it is to  correct over watering. The plants give a clear signal, when they need water, they will start to wither a little. This can be easily remedied by immediate irrigation. However, it is always better to not let it go so far.

Over watered plants, on the other hand, should not be watered for some time. Their recovery takes much longer than when they are under watered. One big problem with over watered plants is that over time they will react with yellowing of the leaves. This also signals other deficiencies, which is why it is often difficult to determine whether it is really over watering or another problem (molds, pests, lack of nutrients etc …). 

My practical experience have shown that under watering your plants will grow slower, reduce their overall size and ultimately harm your final yield. 

Over watered plants in addition to the problems mentioned above, are more prone to mold fungi. So pay attention to the irrigation and humidity level in your cultivation medium – it’s worth it.

3: Distance from the lamp to the plant

Another question that plagues many Growers worldwide is the question of the correct distance from the lamp to the plant. In this case, the answer is much simpler than thought: 

distance from the lamp to the plant
distance from the lamp to the plant


Here are the approximate values ​​of some common lamps which are widely used by growers.

400 Watt HPS – 65 to 70 cm distance.

600 Watt HPS – 90 cm distance.

1000 Watt HPS – 120 cm distance.

From these values ​​it is clear that the commonly used 600 Watt HPS lamp would have to hang almost 1 meter above the plants. However, one has to realize that the lamp should illuminate not only the plant heads, but at least the upper half. So if your plants are 80 cm high, a 600W HPS lamp should hang about 50 cm above the plants. A higher light intensity rarely harms the plants, but the radiated heat from the lamp definitely can.

A simple trick I use to determination how close to the plants I can place the lamps is my own hand. Place your hand level with the top of your plants and lower the lamp until the heat from your light is felt on the back of your hand and then raise the lamp a inch or two. This will ensure you don’t cook your plants.  

Try to make sure all your plants receive the correct light intensity evenly. It is no secret that high-quality reflectors can help with uniform light distribution. Electricity is expensive! You should use your light as efficiently as possible use a quality modern reflectors.

When hanging up the lamps, it must be remembered that the cuttings must first get accustomed to the intense light. Therefore, it is better to hang the lamps much higher in the first week.

4: Cannabis Temperature and Air Circulation

When I mention the temperature, I mean more than just grow room ventilation. Just as important is the temperature of the nutrient solution and cultivation medium. Here chemical processes are started by the temperature, which prevent the nutrient uptake and support salt deposits in the cultivation medium – the consequence is root damage and inadequate food intake.

Cannabis Temperature and Air Circulation
Cannabis Temperature and Air Circulation


Make sure you maintain a proper air temperature of: 26 to 31 ° C in the day, 18 to 26 ° C in the night. The temperature of your cultivation medium and the nutrient solution should be 18 to 24 ° C.

The temperature can easily be measured and their minimum and maximum values ​​can also be easily monitored. These temperatures can be easily monitored by the average grower.  More of a problem is the determination of the oxygen and CO2 content in your grow room without which healthy plant development is not possible.

These gases get into the grow room through good ventilation. Ventilation also usually affects the air temperature, and some of the grower are therefore limited in the winter months and at night. This is a big mistake. It is much more useful for you to provide adequate ventilation and, at the same time, the right temperature. If the temperature falls below the required values ​​during the night, you have to heat the room and let the ventilation continue.

One problem grow I saw used high-quality genetics, carefully controlled irrigation, proven fertilizers and properly selected and suspended lamps. The plants showed no signs of deficiency, they were healthy, green and with strong roots. Only one thing was missing – the yield!.

The buds sprouted and grew, but then their development slowed and did not reach the expected size. The problem took three harvests to remedy, in which the grower tried everything possible, with one exception: to increase the fresh air supply!.

To keep the required temperature at night, he ran the extraction fan only twice a night and only for a limited time. The lamps were in air cooled reflectors, and the fan was switched by a thermostat, so the extractor fan only ran once the temperature reached a set level. After the insufficient ventilation was restored, he reached his hoped-for result.

Ventilation is also important when CO2 is added to the grow room. Like us plants need oxygen for life. In addition, during the night the ventilation is necessary, because at this time the plants consume more oxygen than during the day. When CO2 is added, the system must be adjusted so that the gas is not released until after each ventilation interval. During the night, no CO2 should be added and the ventilation intensity increased.


Step 1: Calculating Room Volume (Room size x Room size x Room size) = CFM

The calculation for working out your extraction is:  First calculate the volume of your grow room. To calculate multiply length x width x height of growing area e.g. A grow room that is 8′ x 8′ x 8′ will have a volume of 512 cubic feet.

Step 2: CFM Required

Your extraction fan should be able to adequately exchange the air in an indoor garden at a minimum of once every three minutes. Therefore, 512 cubic feet  3 minutes = 171 CFM.

This will be the absolute minimum CFM for exchanging the air in an indoor garden, I prefer an exchange of air once every minute.

 A smart move would be to take into account a reduction in fan efficiency due to a carbon filter and ducting etc in this case add on 25% to the required CFM
Required Fan size Taking into Account Carbon Filter and Ducting: (CFM) = (Volume of Growing Space) x 1.33

(8 x 8 x 8) x 1.3 =667 CFM

So in our example the new CFM figure taking into account ducting and carbon filter restrictions we would have is 667 CFM  devided by 3 = 224 CFM  (All numbers have been rounded up)

Make sure your grow room is well ventilated, if you have cold winter temps try pull the air into your grow room from another room this would normally be at a higher temperature than pulling the air directly from outside.

Try to exchange the air in your grow room once per minute if possible, at a bare minimum it should be exchanged once every three minutes.  


5:  Use high-quality nutrients

Everyone knows that a balanced diet with high content of vitamins and minerals will keep us healthy. This also applies to plants. If you want to have a high quality large harvest, you must use quality nutrients. Universal fertilizers should be ignored, because Cannabis is no exception in needing a special nutrient ratio depending on the growing and flowering phases.  

Use high-quality nutrients
Use high-quality nutrients


Today the market offers a wide selection of base fertilizers and additional products. The large selection is often confusing and growers can be at a loss as to which nutrients are best.

This is in part due to some websites which masquerade as unbiased grower information sites but are in fact owned and run by the nutrient manufacturers (we all know who they are). Many manufacturers say their product is best (dont they all) and who knows what that actually means. 

In my opinion, it is not so important which brand you choose. What is more important is whether they are intended for cannabis cultivation and how easy they are to use. I do not need 5 or more boosters or additives  that usually only contain one of the three basic NPK ingredients. I am more interested in using fertilizers which are easy to dose and contain all that is necessary. From experience I know that perfect results can be achieved with the base fertilizers. I do not claim that extra fertilizers/additives are useless, but in my experience they are very often about as useful as snake oil.

For all fertilizers age and storage conditions are important. One should try to buy nutrients which is sufficient for just a few harvests. The reason I say this is once bough nutrients are often times stored in the grow room where they can be subjected to high temperatures and direct light, they can easily spoil fertilizers stored badly or for a long period of time lose their nutritional value, are poorly soluble and can contain molds. Fertilizers should be stored at a constant temperature – the optimal conditions are always indicated on the packaging.

6: Grow room Cleanliness is next to godliness!

It can happen over time that cleanliness in the grow room does not play an important role as it should for growers, and keeping a room clean is simply removing that old nutrient solution container and the space around the plants are kept clean. 

Grow room Cleanliness is next to godliness!
Grow room Cleanliness is next to godliness!


But over time the accumulated dust, dirt from shoes, old leaves, etc. are form an ideal breeding ground for bacteria, mold fungi and diseases, and also for pests. The grow room must always be clean, including tools, sprayers and containers. The floor and the walls must be freed of dust and dirt.

Contrary to what you might expect, a dustbin does not belong in the grow room. Once it is there, emptying it will often be neglected. The optimal solution is to remove any waste immediately from the grow room. If, for example, a leaf infected with mold or a pest is picked and kept in the grow room in the bin, there is every chance that the mold or pest will spread throughout your grow.

In order to increase the chances of success, you must clean up at least once a week, including vacuuming and sweeping as well as removing all dead plant matter. Between two crops a deeper clean should be undertaken.

That’s not all.

As mentioned above, a high-quality and high yielding crop is influenced by many factors. The most important are mentioned above. If all these points are neglected, your perfect harvest will remain a dream. 

Of course, that is not all,  your grow is also significantly influenced by other factors, such as humidity, the proper growth length, the handling of the plants, and many other things which influence the growth and the development of the plants.

In almost all cases, the mistake is in irrigation, genetics or ventilation. So when things are not going so well, I concentrate on the things that have been changed and carefully observe The Six Things You Need To Do For A Successful Harvest


Cannabis Sativa, Cannabis Indica, and Cannabis Ruderalis: Thank you for being the “Gateway drug” to perpetual inspiration, compassion, benevolence, and medicinal miracles: Cannabis grower, photographer with a long experience in cannabis cultivation. His articles are journalistic reports of places where cannabis is already legally cultivated and owned. They are intended to give an impression of the wide range of cannabis cultivation. These reports are intended to help identify the truth about cannabis and reduce prejudice.

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