Hydroponics Cannabis Growing Guide

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Hydroponics is a method of cultivating plants, specifically cannabis in this case, in a solution of water and nutrients

 

As the name may suggest, hydroponics is a soilless method of growing cannabis using water as the primary medium. Within a hydroponic setup, cannabis plants are grown in buckets or baskets filled with an inert growing medium, and are suspended over a tank full of water. The water is filled with all of the nutrients plants need to survive and thrive, and air stones are used to aerate the tank. This basic model manifests in many different forms and systems, with different growers preferring different setups. There are many advantages to hydroponic cultivation, all of which will be covered in this article. But first, let’s delve into the history of this fascinating art form.

THE HISTORY OF HYDROPONICS

Hydroponic cultivation might initially seem like the result of modern advances in technology. But this couldn’t be further from the truth. The origins of growing plants in water goes back thousands of years into human history. The famous Hanging Gardens of Babylon, created in 600 BCE, are theorised to have utilised hydroponic principles. The region located next to the Euphrates was naturally dry and arid. It’s believed the crops of the garden were nurtured using a trickle-system starting at the river.

Moving closer in time to the 10th and 11th centuries, the Aztec civilisation was also known to utilise hydroponics to provide sustenance to their society. After being forced from their land via conflict, these people settled at Lake Tenochtitlan. They proceeded to build floating rafts topped with soil, allowing crops to grow through the tap layer and spread their roots into the waters below.

More recent, but still distant, examples of hydroponic growing involve the English scientist John Woodward in 1699. His work involved cultivating spearmint plants in water. He found that the plant species grew faster within a water source mixed with soil.

The history of hydroponics has shown how effective this method can be in many different settings and scenarios, with cannabis cultivation being no exception. Let’s explore the advantages of this interesting method, and how to apply it to growing great weed.

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THE ADVANTAGES OF HYDROPONIC GROWING

If you talk to a grower who has experience with hydroponic growing, one of the first things they’ll probably tell you is that their hydroponic plants grow much, much faster than those in soil. This is a prime advantage of this method of cultivation—hydroponic plants usually grow 30–50% faster and often provide larger yields. A large reason for this is that nutrients within a hydroponic system are much more readily available to plants. The nutrients are suspended in water and enter directly into the root system as there is no soil to navigate through. In contrast, plants growing in soil must search through the medium in order to uptake nutrients from below. Easy access to nutrients allows plants to preserve energy, which is then diverted to growth efforts instead.

1. CHOOSE A GROWING MEDIUM TO GET THINGS STARTED

Now that we have covered the history and benefits of hydroponic growing, it’s time to get things started. To begin, you’ll need to select a growing medium—a substance that will hold in place the intersection of the stem and roots. From this location, the roots will grow down into the water in search of nutrients. The inert medium also allows good air access to the top of the roots. There is a huge list of different media used by cultivators, with those below being the most common. Each medium has its own unique benefits, and some work better with different systems. It’s all about experimentation when starting out to see which works best for you.

  • CLAY PEBBLES
  • ROCKWOOL
  • PERLITE
  • COCO COIR

2. CHOOSE A HYDROPONIC GROWING SETUP FOR YOUR PLANTS TO THRIVE IN

Now that you’ve selected a growing medium, it’s time to choose which type of hydroponic setup to use. All systems are similar in that they utilise a nutrient-enriched water solution. However, setups can vary widely depending on factors such as water exposure and circulation. Most of the following systems can be purchased, but those with DIY skills could easily make them by using buckets, drills, pumps, and air stones.

  • DEEP WATER CULTURE

Deep water culture is a good place to start for beginners, and is likely the cheapest option. Plants are placed in buckets filled with a nutrient solution and an air pump provides a constant supply of oxygen.

  • EBB AND FLOW

An ebb and flow (also known as flood and drain) system features water that, well, ebbs and flows. These systems consist of several buckets suspended above a growing tray that features a water inlet and outlet. Both of these waterways are connected to an external tank that contains nutrients, an air stone to aerate the water supply, and a pump to move water into the growing tray. The roots in these systems are not continuously submerged within water. Instead, water periodically floods the growing tray with fresh oxygen and nutrient-enriched water. Once the pump cycle ends, all of the water drains back into the external tank.

This system allows for periodic feeding. The time when the growing tray is empty allows growers to easily tend to plant roots and harvest plants.

  • DRIP SYSTEM

drip system in hydroponics is very similar to a drip irrigation system when growing in soil. This system consists of a large tray filled with growing medium, such as clay pebbles. Plants are placed directly into the medium, and each has its own drip pipe nearby. An external water tank with a pump and air stones constantly supplies a drip feed of water over each plant. The roots of these plants are constantly exposed to air, and the excess water drips down the medium and back into the external tank.

  • NUTRIENT FILM TECHNIQUE

If deep water culture is the equivalent of growing cannabis plants in a pond, then the nutrient film technique is the equivalent of growing weed over a river. This system involves placing plants into a tube that is angled, so water can enter at one side and exit at the other via gravity. The roots grow down into the tube, where they are exposed to the flowing water. The water enters from a tank with an air stone and pump, and returns back once the cycle is complete.

  • WICK SYSTEM

wick system is a basic hydroponic setup that uses a growing tray similar to the drip system filled with clay pebbles. Under the tray is a tank of water, from which several wicks exit and enter the growing medium. Water travels up the wicks and passively hydrates the medium. No pump is required for this system.

  • AEROPONICS

Aeroponics is perhaps the most futuristic version of hydroponic growing, and uses misted water dispersed through the air to optimise aeration and hydration. Plants are placed into the top of a large tank of water filling the bottom 25%. Under the water is a pump that sends water into misters underneath the root systems. This fine mist constantly soaks the roots, allowing plants to receive massive quantities of air and water simultaneously.

3. PREPARE YOUR SYSTEM TO ENSURE A SUCCESSFUL GROW

After choosing your system, it’s important to prepare it well to prevent any detrimental situations. The damp and dark nature of water tanks is an ideal growing environment for a host of pathogens. Before running your system, you will need to sterilise your equipment to minimise the chances of contamination. Wipe down all of your buckets, trays, pipes, and tanks with rubbing alcohol, hot water, and peroxide. Once your system is sterilised, begin following the instructions to set it up correctly.

YOU’LL NEED TO MAINTAIN YOUR SYSTEM REGULARLY

Every hydroponic system requires frequent maintenance to provide an optimal growing environment. Below are all of the major factors you need to be aware of.

A) ALWAYS MONITOR PH

You’ll need to constantly test the pH of the water to ensure an optimal growing environment. Nutrients are more available to plants when the environment is slightly more acidic. Therefore, a pH of 5.5–5.8 is required. Use a pH testing kit to take regular readings, and be sure to change the solution weekly to maintain this range. During flowering, a pH of 6 is preferred.

B) TRY TO KEEP YOUR WATER TEMPERATURE AT AROUND 20°C

Hydroponic cannabis has an ideal temperature of 20°C. This factor can be monitored using a water thermometer and altered using a water heater if the temperatures are too low.

C) PROVIDE THE CORRECT QUANTITY OF NUTRIENTS

Hydroponic plants require the same nutrients as their soil-based counterparts. The easiest way to go about feeding your plants is by purchasing hydroponic nutrient solutions that contain all of the required substances for both the vegetation and blooming periods. Products will also describe how often to add nutrients back into your system and how much dilution is required.

D) KEEP THINGS CLEAN TO AVOID CONTAMINATION

Both growing trays and tanks require emptying and cleaning around every two weeks. This process will keep the roots of your plants safe against invading pathogens and diseases. Repeat the same process mentioned above when initially preparing your system.

E) SELECTING A STRAIN FOR HYDROPONIC GROWING

Strain selection is an important factor of hydroponic growing. Plants grown within these systems are free to uptake nutrients extremely fast, which often results in explosive and rapid growth. For this reason, selecting a large, towering sativa variety won’t be your best choice, especially if your system resides within an indoor grow tent.

Smaller and more compact strains are ideal for indoor hydroponic systems. Beginning with a smaller strain is advantageous for several reasons. For one, it will let you cultivate several plants within a smaller space, allowing for more diversity and potentially bigger yields. Additionally, if your plants do go through a growth spurt, you’ll have room to deal with such sudden surges in height.

Below are two strains that we recommend for hydroponic growing.

WHITE WIDOW

White Widow is a perfectly balanced hybrid strain that features 50% indica genetics and 50% sativa genetics. She was created using parent strain White Widow S1, and provides a well-balanced high that stimulates and excites the mind whilst relaxing and stoning the body. A THC level of 19% ensures a powerful psychoactive experience that lasts several hours. These flowers contain a terpene profile that emanates grounding tastes and smells of earth and pine.

White Widow will reach a height of 60–100cm when grown indoors, making her an ideal candidate for the spatial demands of a hydroponic growing operation. Expect good yields of 450–500g/m² after a flowering period of 8–9 weeks.

White Widow

 

ROYAL DWARF

Royal Dwarf presents another logical option for an indoor hydroponic setup. This strain combines Skunk and ruderalis with the aim of creating a compact plant capable of good yields and moderate potency. Royal Dwarf is sativa-dominant and offers a motivating and inspiring head high fuelled by a THC level of 13%. Each hit of this strain is infused with tastes of sweetness complemented by notes of citrus.

Expect indoor plants to reach a stealthy height of 40–70cm, produce yields of up to 200g/m², and run from seed to harvest in as little as 8 weeks.

Royal Dwarf

 

HYDROPONICS CAN BE INTIMIDATING, BUT THE REWARD IS WORTH IT

Hydroponics can seem scary and complicated to the outside observer. All of the different parts, systems, and methods make the subject seem very complex. The key is to start out simple, choose an appropriate strain, and observe your plants’ environmental needs frequently. Growing in a hydroponic setup is very rewarding, and the work pays off with rapid growth times and large yields.

The thought of starting out in hydroponics is scary but it can be done. In fact, it is much easier than it seems. Hopefully this guide will be helpful in setting up and maintaining your hydroponics system.

 

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