Cannabis pH and Watering your Plants

When growing cannabis, and almost any other type of plant, there are various factors that influence how they grow and the quality of the final product such as the quality of the air, water, sun and soil. Any sort of issue with the quality or presence of these parameters will generally produce poorly plants that are likely to catch more illnesses and/or be infested by insects or fungi. That’s why we’re going to be talking about pH for cannabis plants; pH is one of the most determining factors when it comes to feeding cannabis plants and having them absorb everything you give them.

What is pH?

pH is used to measure acidity and alkalinity of a liquid or dissolved solid. pH levels can range from anywhere between 0.0 and 14.0; substances with a pH lower than 7 are considered acidic, whereas those with a pH higher than 7 are considered more alkaline. If the solution is exactly 7.0, it’s pH neutral. A great example of an acidic substance is hydrochloric acid, which has a pH of 0.0, whereas caustic soda (washing soda) is highly alkaline, with a pH of 14.0. Water is the best example of neutral substances, as it tends to sit at around 7.0 pH.



The Importance of Measuring Cannabis pH Levels

When you put a lot of work and effort into growing cannabis in the hopes of obtained the best possible results. pH is an incredibly important factor when it comes to making sure that your plants are absorbing everything you give them via their roots. If your plants’ roots are not being given substances with the right pH, they won’t be able to absorb certain types of nutrients, and in a matter of time they may end up showing signs of deficiencies or excess, as certain types of minerals build up in the growing medium, creating a toxic environment for your plants’ roots while also stopping other nutrients from being absorbed.

If you manage to keep pH levels under check when watering, you still may end up with deficiencies or overwatering, although the probabilities of this happening are much lower and they’ll be much easier to fix if the pH is right.

What Should pH be for Cannabis Plants

For a cannabis plant to grow to the best of its abilities, you need to keep in mind that pH levels shouldn’t always be exactly the same; depending on the strain grown, the stage in which it is in (germination, growth, pre-flower, bloom), the growth medium and whether you’re growing organically or using minerals, the pH level of your water should vary slightly.

You can grow cannabis by keeping the pH at a constant level, although it’ll need to range between 5.5 and 7.0. This allows for decent results, although you won’t be making the most out of your seeds nor the nutrients you’re using to feed your plants. Plus, you may end up with feeding and nutritional issues further down the line.

These are the ideal pH values for growing cannabis in hydroponic and aeroponic settings including other inert substrates:

  • First weeks: 5.8 – 5.9 pH
  • Pre-bloom: 6.0 – 6.2 pH
  • Real bloom: 6.0 – 6.3 pH

These are the ideal pH values for growing cannabis peat mixes or straight in the ground:

  • First weeks: 5.5 – 6.0 pH
  • Pre-bloom: 6.0 – 6.2 pH
  • Real bloom: 6.2 – 6.5 pH

Adjusting pH for Cannabis Plants

Figuring out how to adjust the pH in your water isn’t that complicated at all. You need to discern between watering using nutrients and only water, and there will be a difference between using automatic watering systems and watering manually.

Using just water

Fill your tank or bottle, let the water sit for a few minutes and then measure the pH in the water using a pH meter.  If needed, follow the instructions provided by the manufacturer of your pH Up or Down products. If there is no recommendation, add an extremely small amount to your water tank or bottle, dilute properly and let it sit before measuring  it again. Repeat this process as many times as necessary until pH levels are as desired.

Water with nutrients

This process varies depending on the fertilizers used; some brands recommend adjusting the pH before adding their products, whereas others recommend measuring and adjusting the pH after adding them to your water. If the manufacturer has not left any specific instructions, we recommend dissolving your nutrients one by one, mixing thoroughly. Then, you’re going to need to let it sit for a few minutes in order for the pH to balance out. This way you can measure and adjust accordingly without any fluctuations.

Hydroponic watering

When it comes to automatic watering systems, a large tank is usually used alongside an automatic pipe system which usually contains water and nutrients, enough to feed your plants for about one to two weeks. In order to adjust the pH and keep it balanced within the recommended pH value, we recommend using pH and temperature monitors so that you can have an eye on the pH at all times. This allows you to easily and quickly adjust the pH when needed – all you have to do is keep an eye on it and you’ll be able to fix it before anything goes wrong.

Note: in order to avoid taking too long to adjust the pH in your water, we recommend writing down the original pH of your water and then writing down how much product was needed to get it to the right value. This will save plenty of time down the line.

How to adjust the pH in Water |The Best pH for Cannabis

Adjusting the pH in your water can be so simple that it gets complicated if you don’t have the proper tools and they aren’t in decent condition. In order to do this correctly, you’ll need to use a pH meter as well as specific liquid products used to adjust pH upwards or downwards. We’re going to have a quick look at pH meters and liquids used for adjusting pH.

  • pH Meters

pH meters are measuring instruments that are quite easy to use; most of the time, all you have to do is switch it on and place the sensor end in the water in order to analyze its pH. In order to avoid bad readings and issues with the meter itself, we recommend cleaning it after every use as well as adjusting them when necessary. Also, you’ll want to keep the sensor moist using a maintenance solution.

  • pH Adjusters

Liquids used to reduce or increase the pH in nutrient solutions contain either acidic or alkaline ingredients, which can be organic and/or mineral. Plus, depending on the manufacturer, some pH adjusters can be specific for the growth period or for the bloom phase.

Mineral pH adjusting products are generally made using the following ingredients:

  • Nitric acid: depending on the ratio, you can use this to increase or decrease pH levels, plus it’s perfect for the growth period thanks to its high Nitrogen count.
  • Phosphoric acid: this is used to lower the pH and it’s ideal for the flowering period thanks to its high phosphorus content, although it can also be used in the growth period.
  • Potassium hydroxide: this is used to increase the pH in water. Thanks to its high potassium content it can be used in the growth and flowering periods.

Organic pH adjusters tend to contain the following components:

  • Humic acids: these acids increase the pH in your water and can be used during the entire growing period, although we recommend using it during the growth period as humic acids can actually decrease THC yield.
  • Citric acid: this is used to decrease pH and it can be used during the entire growth and flowering process.

The main difference between organic and mineral pH adjusters is that the minerals tend to harm any natural life in the soil, so you need to rebuild it after every use. Organic products don’t have the same reaction, although you’ll need to use slightly more product than mineral products in order to get the desired levels.

Cannabis pH Meter Types

pH Testing Drops

pH for cannabis plantsThis type of pH measuring kit is one of the easiest kits to use; all it contains is a vile, liquid reagent, and a color chart. In order to figure out the pH in your water, all you have to do is fill up ¾ of the vile using the water you want to analyze. Add in a couple of drops of the liquid reagent, and then place the lid on the vile straight away. Shake thoroughly for a few seconds and then text the color using the included color chart – this allows you to figure out the pH in your water.

We highly recommend keeping in mind that this type of reagent liquid can only be used in water without any nutrients or additives, as it will end up giving a false reading in such cases.

pH 600 ECO Milwaukee Meter

pH for cannabis plantsThis is one of the most used pH meters on the market when it comes to indoor and outdoor growing rooms, as it’s the most affordable one and it provides good results. It’s a great way to get started when it comes to growing cannabis if you’re on a budget. You’ll need to calibrate it by using a calibration liquid – first, adjust it to 7.0 pH and then adjust it down to 4.0 pH. In order to adjust the pH to your calibration liquid, you need to turn the small screw that it has while checking the screen to make sure you’re adjusting it right.

The only downside to this meter is that you’re going to need to keep the sensor clean and humid/moist by using a pH meter maintenance liquid – if not, your meter will most likely start producing erroneous results when compared to other meters. You’ll also need to take into account that this device is not water-resistant, so do not let it fall into the water when using it.

pH for cannabis plantsADWA pH AD-100 Meter

This pH meter is slightly more sophisticated than the previous model; as well as offering precise data, it can also adjust itself automatically when using pH 7.0 and 4-0 calibrators, which come included. It also has an automatic temperature compensation feature, which makes for much more precise measurements. This particular model is much stronger and more trustworthy as times goes on, although just like with any other meter, you’ll need to keep it humid and in good condition to avoid bad readings. The only inconvenience here is that it isn’t waterproof; all you need to do is place the tip of the sensor in the water.

ADWA pH AD-11 Meter

pH for cannabis plantsThis AD-11 ADWA meter is a semi-professional model that, apart from precisely measuring the pH in your water thanks to automatic temperature compensation, also indicates the temperature of the water and can emerge unscathed if dropped in the water. This doesn’t mean that it’s entirely waterproof, and you still need to use the sensor part when measuring pH values. These water-resistant ADWA meters are quite prone to sensor issues, as they’re quite delicate, but you can easily get your hands on a replacement sensor. This allows you to keep one on hand just in case it breaks and your plants are at a delicate period.

In order to calibrate it, you’ll need to hold the ON/OFF button for a few seconds while it’s on until the letters CAL come up on the screen. Next, the meter itself will let you know what calibration liquid is needed – first, you have to use pH 7.00 and next you’ll need to use pH 4.00. In order to keep it in decent shape, you’ll need to clean it after every use and use maintenance solution when storing it to keep it working well and for much longer.

Guardian Bluelab Monitor

BlueLab Guardian The Guardian Bluelab Monitor is, without a doubt, the most sophisticated, professional and precise pH meter found in this post; it’s a pH, EC and temperature meter that works continuously; it’s a great idea for hydroponic and aeroponic grow set-ups, as these types of grows tend to need a lot more control when it comes to the water used.

In order to use this continuous pH, EC and temperature meter correctly, all you have to do is place the monitor at head-height so that you can easily take a look at it, and then you’ll need to adjust the pH and EC in your water, depending on your plants’ needs and the period that they’re in. It also has a visual alarm system (a blinking light) that lets you know when the pH or EC in your nutrient tank aren’t at the right values, allowing you to correct almost any fluctuation instantly.

When you use any type of continuous pH monitor, you’ll end up saving loads of time when it comes to watering, allowing you to make the most of your cannabis plants’ potential. Keep in mind that the sensors can be replaced in case one of them breaks or is worn – you can easily replace them. In as far as its calibration system, it’s super easy – only the pH sensors needs to be calibrated in the exact same way as the rest of pH meters on the market. We recommend cleaning the sensors after every grow and storing them in maintenance liquid.

In order to learn more about the pH meters for growing cannabis plants in this post, you can go straight to their product page by clicking on their picture, allowing you to visualize the product better thanks to their concise, simple descriptions that make them incredibly easy to understand. Plus, we stock many more models that you can have a look at!

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