Gro-ology 101: Essential Elements for Growing Cannabis with Hydroponic Growing Mediums

Gro-ology 101: Essential Elements for Growing Cannabis with Hydroponic Growing Mediums is a comprehensive exploration of the science and art of cultivating cannabis using soilless hydroponic mediums. Hydroponic cultivation is becoming increasingly popular among growers as it can produce larger yields in shorter time frames, but there are several essential elements which need to be understood and implemented in order to successfully grow cannabis with a hydroponic growing medium. This article will provide an overview of those essential elements and provide recommendations for successful hydroponic cultivation of cannabis.

The first essential element for successful hydroponic growing of cannabis is the substrate, or the growing medium. Hydroponic growing mediums include perlite, vermiculite, coir, rockwool, and even air. Each type of medium provides a unique kind of nutrition to the plants, and different cannabis strains may require different mediums. It is important to select the medium carefully and ensure that it is of the highest quality and free from contaminants.

The second essential element is a carefully designed nutrient solution. Cannabis is a heavy nutrient-feeder, and the nutrient solution must be tailored to the specific strain of the plant being cultivated. The pH of the nutrient solution is also critical, as cannabis plants require a more acidic solution than most other plants. A high-end digital pH meter is important to monitor pH levels and make sure the nutrient solution is in the desired range.

The third essential element is careful monitoring and adjustment of environmental factors. Optimal growing conditions for cannabis include high intensity lighting, adjustable temperature and humidity, and access to fresh air. It is important to ensure these conditions are carefully maintained, as an imbalance in any of them can be disastrous for the plants. The use of automated hydroponic systems can help in this regard, as these systems can accurately measure and adjust the environmental factors for optimal growth.

The fourth essential element for hydroponic cultivation is regular maintenance and monitoring of the growing medium. The medium needs to be checked for impurities, nutrient deficiencies, pest infestations, and excessive moisture. Each of these factors can cause serious damage to the plants, and regular maintenance and inspection of the medium is essential to ensure optimal growth conditions.

The fifth essential element is the application of an appropriate growing schedule. Cannabis plants require different light schedules and nutrient levels at certain times throughout their growing cycle. An appropriate lighting and feeding schedule must be developed and followed in order to ensure healthy and abundant yields.

Finally, it is essential to have a plan for harvesting the cannabis. Most cannabis plants take 8-10 weeks to reach maturity, and the harvest must be timed properly in order to get the most out of the plants. It is also important to understand the different types of harvesting methods, as this will make the process easier and more efficient.

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Plant Nutrients

A key component to a successful cannabis grow with hydroponic growing mediums is the nutrients added to the medium. There are various nutrient solutions for the plants, and it is important to understand the difference between them and which best fits the needs of the specific strain. It is also important to ensure that the nutrient solution is tailored to the strain’s specific needs and that the pH of the solution is monitored and adjusted accordingly.

Phosphorus and potassium are the two main macronutrients added to a nutrient solution and are both essential to the growth of cannabis. Both phosphorus and potassium help to encourage strong root growth while potassium contributes to the overall health of the plant. Calcium, magnesium, and sulfur are also important micronutrients added to the solution that bolster the general health of the cannabis plants.

The sulfur allows plants to better tolerate temperature variations and helps with nutrient uptake and metabolism in the plant. Magnesium aids in the development of new leaves and aids in stabilizing the pH of the nutrient solution. Calcium keeps the cannabis plant strong and helps the plant take up other nutrients from the medium.

It is important to understand the importance of each nutrient, as well as how much of each nutrient is needed for optimal growth. This can be done through regular monitoring and adjusting of the nutrient solution to ensure the optimal nutrition of the plants.


With cannabis, lighting is essential for optimal growth. High Intensity Discharge lighting systems such as HID are usually employed to provide adequate light to the cannabis plants. These lights help to encourage photosynthesis, which is essential for plant growth and flowering. The intensity and duration of the light can also be adjusted to fit the growth stage of the plant, with brighter and longer periods of light during the vegetative stage, and lower and shorter periods of light during the flowering stage.

Besides the type and intensity of light, it is also important to consider the color or spectrum of the light. Cannabis plants respond differently to different spectrums, so the type of LED or HID light needs to be carefully selected. Different light spectra can produce different yields, so understanding what spectrum of light works best for each strain is important.

Lighting is another important factor that can have a major effect on the growth and quality of the cannabis plant. Proper lighting is essential to ensure that the plants reach their potential, as too much or too little light can result in stunted growth or reduced yields.

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For outdoor grows, positioning of the grow operation should be carefully considered. Although outdoor growing conditions can sometimes provide more intense light than grows indoors, positioning the plants so they can get the most light is essential. It is also important to remember that the plants may need some protection from the elements, such as wind and excessive rain.


Watering is a key component to successful hydroponic cannabis cultivation. The nutrient solutions need to be regularly monitored to ensure that the water and nutrients are properly mixed, and of the right proportions for each specific strain. Too much water can saturate the medium and cause root rot, while too little water can leave the plants prone to dehydration and nutrient deficiencies.

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It is important to understand the water requirements for each particular strain and adjust the nutrient levels accordingly. Depending on the type of growing medium, the amount of water and nutrients used will also vary. Several automated hydroponic systems are available to help in this regard, as these systems can accurately gauge water levels and adjust the delivery of water and nutrients as needed.

It is also important to monitor the pH level of the water. Cannabis plants prefer a slightly acidic medium for optimal growth, and so the pH level should be closely monitored and adjusted as needed. Again, digital pH meters can help with this, as they can accurately measure and display the pH of the water.

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The use of automated hydroponic water systems is also recommended. This type of system not only maintains the water levels and nutrient proportions, but they also help to keep temperatures and humidity levels at optimal values. This is especially important when dealing with high-intensity lights, as the temperatures can easily begin to rise and create an unhealthy environment for the plants.

Pest Control

Pest control is essential for successful hydroponic cannabis cultivation. The fact that the plants are not in contact with soil makes them more vulnerable to pests and disease, so check the growing medium regularly for signs of infestations. Different pests may require different remedies, and it is important to know how to identify and combat different types of pests.

There are several natural methods for controlling pests in a hydroponic grow, such as introducing beneficial insects and plant-based repellents. Plant-based repellents include neem oil, pyrethrin, and spinosad, among others. These are safe for the plants and can effectively deter various pests. It is important to research each of these methods before use to ensure optimal pest control.

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If natural methods are not effective, there are a variety of commercial insecticides and fungicides available that can effectively target certain pests. These need to be applied carefully, as not all chemicals are safe for cannabis plants and some may be harmful if not properly utilized. Again, it is essential to research the products and select one that is safe and effective.

In using chemical pesticides and fungicides, it is essential to understand the label instructions and use the correct amount. Too little may not control the pest problem, while too much can be damaging to the plants. Again, this is another area where automated hydroponic systems come in handy, as they can accurately dispense and adjust the dose of chemicals for optimal pest control.


Harvesting cannabis plants at the optimal time is essential for high-yields and optimal bud quality. Plants typically take 8-10 weeks to reach maturity, and the harvest must be timed correctly in order to get the most out of the plants. There are several methods of harvesting, such as wet and dry, and the method of choice may depend on the strain.

In wet harvesting, the plants are still wet with nutrient solution when harvested. This requires the drying process to take longer, but for some strains, wet harvesting can create larger yields. Dry harvesting requires that the plants be completely dry before harvesting, and this process can be sped up by letting the grow lights run for a few days before harvesting.

Finally, proper trimming techniques can help to ensure higher-quality yields. Depending on the bud size and quality desired, the trimming techniques may need to be adjusted. In general, trimming too soon or too late will reduce the quality of the yields. It is important to understand what quality is desired and how to adjust the trimming time accordingly.


Growing cannabis with hydroponic growing mediums is a science and an art that requires careful consideration of essential elements essential to achieve success. From the substrate and nutrient solution, to lighting, watering, and pest control, each element must be properly monitored and adjusted to ensure that the cannabis plants reach peak performance. The use of automated hydroponic systems can help to ensure optimal conditions, as these systems help to precisely measure and adjust environmental and nutritional factors. With the right knowledge, supplies, and care, hydroponic cultivation can help to produce larger yields in short time frames.

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