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Best Water for Growing Plants | Cannabis

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Water is one of the most important things when it comes to life as we know it on our planet, including plants, but what is the best water for growing plants? It stands to reason that the quality of the water that you give your cannabis plants directly influences the quality of the final result. People generally tend to use the first water that they can get their hands on, which is usually tap water – combined with the fact that people usually add loads of different products to the water in order to feed their plants without checking pH or EC, this can be disastrous. Your plants will be more likely to catch plant illnesses and attract insect and fungi infestations, which can lead to terribly quality flowers once harvested.

In order to guarantee quality flowers and to make the most out of the nutrients used, the most important thing is to make sure that you know the type of water you’re going to use, and its contents. Secondly, you’ll need to work using specific pH and EC levels so that your plants can absorb everything they need; these levels vary depending on the phase your plants are in and depending on the strain grown. This is why you absolutely need pH and EC meters when growing cannabis, although this post is more about different types of water and how they can be used.

What’s the Best Water for Growing Plants?

We’re going to go through a few different types of water that you can use when growing plants, whether they’re cannabis, flowers, aromatic or decorative plants – many people have misconceptions regarding this issue.

Tap Water

Tap water is probably one of the most used types of water when it comes to watering cannabis, as it’s definitely the easiest to access. Whether you should use this type of water or not depends on where you live, as the water in certain areas has different characteristics than others. You should be able to check this at the town hall or through town officials Tap water can be hard, (EC + 0.8), medium (EC + 0.4) or soft (EC – 0.4), and it generally has a pH of over 7.0 as well as containing a lot of products that help keep it clear. Tap water also contains lime, chlorine and fluoride in some cases, which can kill natural life in soil and decrease its quality.

In order to water your plants using tap water you can do various things; let the water sit for about 24h so that some of the minerals and other components have time to fall to the end of your tank. The second thing that you can to is you can use an osmosis filter in order to clean your water and make it potable for both people and plants.

Distilled Water

Distilled water is sold in supermarkets and drug stores, and it doesn’t contain any minerals or any other type of microorganism, bad or good. This water is perfect for plants and can be consumed by people although due to the fact that it contains no minerals at all it’s not recommended for continuous consumption. In order to use it on plants, all you have to do is keep in mind that it generally has a pH over 7.0 and an EC of 0.0, so we recommend adjusting the pH and adding calcium and magnesium until it reaches 0.4 EC.

Distilled water is obtained through a process of distillation, which essentially heats the liquid up until it becomes vapor. The vapor is then cooled down in order to retrieve the water, with every other component having evaporated.

Air Conditioner Water

Air conditioner water is taken from your very own air conditioner, and you can use this water when it comes to watering your cannabis plants, as it’s essentially distilled water, although we always recommend using an EC meter; depending on how old the AC unit is or its design, it may actually have an EC of 0.4 rather than 0.0. Its pH is usually over 7.0.

Reverse Osmosis Water

Reverse osmosis is a type of water that’s similar to distilled but not quite as pure, as it doesn’t eliminate 100% of all minerals (lime, chlorine etc.) and other impurities in water, but it’s incredibly similar and you can get it from your own type by simply getting a decent osmosis filter and setting it up. Depending on the filter and how long it’s been there for, osmosis filters tend to produce less than 0.4 EC and around 7.0 PH, so you can drink it if you want and you can use it to water your plants without needing to modify it at all.

Reverse Osmosis water is obtained by using filters that trap the minerals and other unwanted elements in the water; depending on the filter and the model, the water will be more or less pure, and therefore higher or lower quality. Reverse osmosis water is always a better bet than tap water or water that you can get from rivers/lakes etc.

Rain Water

Rain water, as the name suggests, is water obtained straight from nature herself, filling tanks up with rain which you can store and then use at a later date. This water is generally not potable, although some studies would suggest that it is. Regardless, it can be used to water pretty much any type of plant, as when rain is gathering it tends to automatically eliminate any harmful elements, plus plants in nature grow using rain water; rain water is one of the cleanest fresh waters on earth. It tends to have a pH close to 7.0 and an EC no higher than 0.4.

In order to get the highest quality rain water possible you’ll need to set up a water collection system, which will need to stay as clean as possible in order to avoid absorbing elements that could decrease the quality of the water. You can also have it set up on an impurity filter. We recommend using rain water obtained outside of cities, as the rain that falls in the city is usually contaminated as it falls through an already contaminated environment.

Well, reservoir, spring water etc.

Water obtained from wells, springs, reservoirs and other similar sources is not entirely recommended unless you actually know its composition via a study done in your area; you need to know its mineral and chemical content. This is absolutely necessary, as it may have been contaminated using chemical insecticides or mineral fertilizer, which might render it useless for your plants. Plus, these types of waters tend to contain large amounts of bacteria, fungi, virus and parasites due to animals and possibly even people.

In order to use this type of water we highly recommend studying it beforehand and then, if necessary, treating the water or preparing your storage area to avoid bacteria from spreading. If it’s a well that you own, you can empty and treat the surface using ultraviolet light, or you can also treat it with chlorine. If it’s a spring or reservoir or somewhere public, you’ll need to talk to the authorities in the area in order to figure out its contents and take the necessary measures if the water isn’t apt for plants or life in the area.

River Water

River water may sound like a great idea for watering your plants at first, and maybe even for drinking, although this is not recommended at all. Rivers are generally kilometers long and can have stretches in which they’re contaminated by pesticides, industrial areas or factories that use the water for residues; rivers can also contain dead animals which contaminate water due to decomposition.

On the other hand, the location of the river can give its water unique characteristics; you’ll never find the same type of water in two different rivers. Plus, due to the content of certain minerals, it’s probably more than likely not apt for cannabis growing and you’ll need to analyze all of its contents, not just pH and EC.

In order to use river water you should probably live near somewhere where your town hall can assure you that the rivers don’t contain any sort of contamination caused by human kind. If you nonly have access to water that’s in rivers near or in cities, we highly recommend avoiding using it.

Bottled Mineral Water

Bottled water is obviously designed for people to drink, although it’s not the best option for cannabis plants. Still, it’s better than using unknown tap, river, or well water. Mineral water is guaranteed to contain no harmful substances, and its EC levels are lower than 0.5, with a pH around 7-0, although it may have high amounts of different minerals which may end up affecting how your plant grows and how the soil behaves, such as calcium.

In order to work using bottled mineral water you need to choose a brand that has the lowest amount of minerals, and you need to adjust the pH and EC like you would with any other type of water; it’s easy.

The Best Water for Growing Plants

So, after going through various different types of water you can use when growing cannabis, including some you may not have thought of, the best water for growing plants is clearly reverse osmosis or distilled water. These two types of water can guarantee that your plants aren’t getting any toxic minerals or anything they shouldn’t get unless you’re adding it to the water – it also makes it easy to give your plants a 100% controlled diet. Let’s have a look at our ranking of the type of water you should use for growing your cannabis plants:

  • Distilled water
  • Reverse osmosis water
  • AC Unit water
  • Bottled mineral water
  • Rain water
  • River water
  • Well, reservoir etc. water
  • Tap water

This ranking is of course just an estimate, and the different types of water mentioned in this post may vary in position depending on their individual characteristics related to location and environment.

Do you want to know what the best water for growing plants is? Read on to find out how to get the most out of your crop through correct water prep!

The Best Water for Your Cannabis Plants

The Best Water for Your Cannabis Plants

Water is one of the few ingredients we provide our cannabis plants – however it could be considered the most important. Without proper water, your plants will grow slowly and become sick.

The reason why water is such a crucial ingredient is because the mineral levels in our local water can vary heavily across different parts of the world, and even within the same city. Leads and other toxins from the water taps and pipes can threaten your marijuana plants without you knowing. This is especially true for areas which are still supplementing their water with chlorine, which can harm plants during all stages of their growth.

In order to safeguard your cannabis plants from contaminants in the water, many growers will use a water filtration device, or a process called reverse osmosis, to purify and remove any harmful materials from the water, While filtering the water yourself may become expensive, large jugs of pre-filtered water are may be found at a reasonable price.

The Best PPM For Cannabis Plants

Did you know that all tap water contains tiny solids? This is due to imperfect filtering or run off from your pipes. It’s also known as, hard water. These solids are measured by the volume of contaminates per unit of the liquid’s mass. We express this as particles of contaminates found per one million particles of water. Or simply, PPM (parts per million).

If you are not testing your water source regularly for excessive minerals, you should be – testing you water for contaminates can be accomplished by purchasing a (total dissolved solids) TDS meter, which are often inexpensive while still being reasonably accurate.

Before using your TDS meter for the first time, it is important to calibrate it in order to prevent inaccurate readings. To identify the PPM of the water you are feeding your cannabis plants, simply insert the TDS meter into a contained source of your water and wait for a few seconds.

Note, if you are testing in a different container than the one you are using to water your marijuana plants, be sure to clean it thoroughly. Any dirt or contaimination which is in the container will notably impact the readings reported by your TDS meter.

Before we go any further, it is important to understand that your plant should not be fed soft (filtered) water without added nutrients. Young cannabis plants enjoy from 500-600 PPM of added nutrients, close to about 850 PPM for a vegetative plant, and up to 1150 ppm for the plant when it’s in its flowering stage.

There is a difference between good and bad nutrients. Tap water can contain a build up of toxic minerals from dirty or aging pipes. While it may be fit for human consumption, feeding young plants unfiltered water can be detrimental to their health. To avoid this issue, you can purchase nutrients, from any garden or grow store, and add t the water once it’s bee filtered. Good nutrients are mixed into filtered water at the grower’s discretion. They are designed help your plant grow.

Average mineral levels for tap water are typically around 300-400 PPM. This can be too high for your plant if you are also using liquid fertilizer. Any higher than 500 and you should invest in a water-softening solution. Know that these numbers are not dangerous for humans. Mineral waters, such a Nestle or Aquafina can contain 560+ PPM and are among the most popular brands available. Reverse osmosis systems are expensive and can cost hundreds of dollars. We like to use store-bought, disposable water filtration systems, like Britta. These are expected to lower your TDS to 50 PPM for a fraction of the cost of a reverse osmosis system.

Filtering your water will also remove nutrient-rich minerals such as iron, calcium, magnesium and potassium. If removed, they need to be replaced. Otherwise, you run the risk of mineral deficiencies affecting your plants.

If you are concerned your plant may be experiencing some nutrient deficiencies, you will be able to tell upon inspection. The plant’s leaves may be misshapen or an irregular size. Check to see that their leaves have maintained a healthy green color. Brown spots or burned edges can be a sign the plant has nutrient deficiencies. If this is the case, be sure to take the appropriate corrective measures. First, water your plants with PH neutral water for a few days and reduce the nutrients to half the regular dose. Finally, remove a few centimeters of top soil from the plant and allow it sometime to recover.

Irregular PH levels can block nutrients from your plant. Too much nutrients can affect the bud’s flavor. We recommend ceasing fertilization a few days before harvest. For best results, follow the manufacturer’s instructions when debating on how much nutrients or liquid fertilizer to give your plant. Using good water is always important to keep your plant in good health. We hope you found this informative and wish you the best of luck in watering and nourishing your plants.

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Water is one of the few ingredients we provide our cannabis plants – however it could be considered the most important. Without proper water, your plants will grow..