Cannabis pH Chart & Guide
pH is one of the more mysterious aspects of growing cannabis. While cannabis plants can grow outside of their ideal pH levels, the further pH strays from ideal, the less healthy the plant will be which equates to lower yields. So let’s look at the definition of pH, why it is important and what pH levels should you strives to maintain over the course of the plant’s life. Or you can just skip the cannabis pH guide and simply look at the Cannabis pH Chart at the top of the page.
What is pH?
pH stands for the potential of Hydrogen ions in the water. The pH scale runs from 0 – 14.0, but for plant purposes we can concentrate on the levels between 4.0 – 8.5. A value of 7.0 is considered pH neutral, below 7.0 is acidic, above 7.0 is alkaline. Here is pH in the simplest format:
Simplest pH Scale
Acidic 0 – 6.9
Alkaline 7.01 – 14
Why is pH important?
Because pH imbalance makes it difficult for the plant to absorb nutrients with its roots. Whether a cannabis plant is planted in soil, coco, or hydro, pH levels need to be maintained to optimal levels. For simplicity we will simply use “Soil” to stand for all three.
When the soil is too acidic, cannabis plants will begin to lose their ability to absorb nutrients through their roots. As the soil gets more and more acidic, the plant will lose all ability to feed and eventually become toxic.
Similarly, when the soil becomes too alkaline, phosphorus and calcium can’t be broken down which stunts the plant’s growth. If the soil becomes too alkaline, the plant will be subjected to root damage.
However cannabis plants prefer an acidic soil so problems start to arrive around a pH of 6.5, which is slightly acidic but is not acidic enough for the plant’s liking. You want the cannabis plant to be able to use all the phosphorus it can at all times, but especially during flowering. Phosphorus and Potassium are required in high amounts during the mid flowering phase so better to be slightly too acidic than slightly too alkaline.
Cannabis pH Levels
4.0 and below: Toxic
4.0-5.3: Poor Nutrient Uptake
5.3-5.8: Good pH Level
5.8-6.3: Perfect pH Balance
6.4-7.0: Acceptable pH Level
7.1-8.4: Poor Nutrient Uptake
8.5 and Above: Root Damage
If you are reading this article, don’t use paper strips like in science class. You need to be more accurate than that. Any pool supply store and Amazon will sell you a pH meter for $10. Often times you can get a pH and ppm set (2 different meters) for $15 or less. This is a good purchase as ppm is another important factor in growing healthy cannabis plants.
To measure soil pH, water the plant thoroughly and measure the pH of the run off from the bottom of the pot. You want to measure the pH of the soil and then add water adjusted to the correct pH to balance the soil. For example, if you measure the run off water at 6.5, you will want to add water with a pH around 5.5 to bring the soil back into the perfect 5.8 – 6.3 range. The reverse would be measuring run off that measures 5.0. You would then need to add water at pH of around 6.5 or 7.0 to bring the pH of the soil back up.
Adjusting pH Levels of the Feed Water
You can buy pH adjusters over the counter or you can try homemade solutions. Store bought pH adjusters will be two bottles, pH + and pH -. It’s as simple as it sounds. Measure the pH of your water then add the appropriate adjusting agent.
Homemade solutions can straight from the list of common items. Since no tap water should have a pH too much below 6.0, often times you will need to add an acid to your water. The simplest solution is lemon juice. A little lemon juice can bring down the pH of water easily. If nutrients have lowered the pH of your water to far, a tiny bit of baking soda.
Interestingly, even though sea water is alkaline at 8.0, you can’t just add salt to water to raise the pH. What you actually have to do is add salt and a bit of lemon juice to the water. A strong alkaline sea salt or Himalayan salt with a weak acidic solution(water with a little lemon) will create alkaline water*.
Now you should have a good grasp of the role pH plays in growing healthy cannabis plants. You should also new have the tools to measure and adjust the pH of the water used and the soil and/or hydro system. Maintaining a proper pH throughout the life of the cannabis plant will allow it to grow to its fullest potential and thereby yield its maximum amount.
* Alkaline water is supposedly quite healthy. By drinking alkaline water with a pH of 9.0 – 10.0 it helps the body cle anse acidic wastes and toxins.
The best way to germinate cannabis seeds!
With this guide, we would like to explain to you, how to germinate a cannabis seed most successfully. There are three common methods of cannabis seeds to germinate. Properly executed, they will be successful in almost every case.
- Germinate hemp seeds directly in soil
- Activate cannabis seeds with water
- Germinate cannabis seeds in damp cloths
So that cannabis seeds can be germinated under optimal conditions, in all three breeding types, some basic rules have to be considered. Before we describe the methods exactly, we first want to talk about these basics; The first golden rule is for example, not to treat cannabis seeds with bare hands to avoid the chance of contamination with bacteria or fungus. We strongly recommend the use of clean gloves and some disinfected tweezers!
Germinate weed seeds – The quality of the water:
The water temperature should be around 20 degrees and have good quality. The quality of the water can be tested with a PH meter and an EC meter. Recommendation: Osmosis water or drinking water very debil (with little salts and mineral arm).
The ideal substrate to germinate weed seeds:
You can work with different substrates. The most common are earth (light mix), coco and rock wool. Even with the substrates, the soil and ambient temperature should be right. A light mix is specially adapted to sensitive plants such as hemp. Most mixtures contain nutrients and minerals for a few weeks, which the young plant absorbs when it needs them.
For Coco substrate, before working with it, you should test the EC content, as most Coco substrates have a very high value. To lower the value, wash the Coco once with mineral water (osmosis water).
Breeding for coco and rock wool is also referred to as hydroponic cultivation, which means that significantly more air circulation at the roots is created. But the nutrients that are then fed to his plants are more directly absorbed by them. The risk of over or under-fertilization is greater but also the expected yield. Breeding on hydroponics is what gardeners with more experience.
Required air, light, and temperature for germination:
In order not to endanger the germination capacity of the seed, it should be stored in a dark and cool place (6 ° – 10°).
Before the seed is germinated, it must not be exposed to light and the air temperature should not be below 20° C (68° F) nor exceed 30° C (86° F). Maintaining a temperature around 25°C (77° F) is ideal. For outdoor cultivation, it’s recommended to germinate indoors, letting the seedlings grow for a few weeks, and don’t set plants outside too early.
Method 1. – Germinate hemp seeds in soil
- Prepare material (fill small flowerpots with soil).
- Lightly moisten the potting soil with good water. (Too much moisture = mold and fungal danger).
- Place the seeds in a 0.5cm recess in the center of the pot. Make sure that the seed is transverse and not upright, this can affect the germination rate. Nature has not shaped the seed without reason oval. If you set the seed transverse, it will easily position itself properly in the soil after germination! When you work with jiffies it works something similar. The jiffy is only soaked in water until it swells apart, then the water is expressed again without crushing it until residual moisture is over. At Jiffy, the factory usually prepares a slight depression for the seed.
- Lightly cover the seed with soil so that no light can shine directly on the seed. Also with the jiffi one covers the seeds with a little material. Wet but not wet! Now pour no more that could flush the seed back up and the amount of water is also difficult to control.
- In case of too little moisture, we recommend wetting the plant with a spray bottle.
- Now put the plant in a safe place and depending on the variety and genetics can be expected in the next 36 to 72 hours with a first result. In some cases, it can take up to 6 days.
Method 2. Germinate cannabis seeds in a paper towel.
- For preparation, we gonna need two plates, some sheets of kitchen roll, good quality water as described above, and our seeds.
- Put two sheets of kitchen paper on one of the plates and moisten them with water.
- Put your seeds on the damp cloth and put two more kitchen towels over it.
- Moisten also the upper cloths. Runoff excess water that the wipes are only slightly saturated.
- Put the second plate on the other plate like a shell.
- Store in a dark place and check daily that do not dry out the kitchen towels and of course to see if the seedlings are already broken. Once it is germinated, a small white shoot comes from one side. Now the time has come, the seed can be placed in the substrate of your choice. Carefully remove the seeds with tweezers from the cloths and carefully place them diagonally with the small germ downwards into a prepared hole. Only so deep that the seed is slightly covered with soil (max 5mm).
7. Wait, wait, wait and then be happy.
Method 3. Germinate cannabis seeds in a cup of water
This method is particularly suitable for activating seeds that have been stored for a long time
The addition of hydrogen peroxide is suitable for softening the husk of the hemp seed. About 3 – 5 drops per 100 ml of water are sufficient.
- Prepare a cup of water at a temperature of about 12 degrees Celsius (54 degrees Fahrenheit).
- Put the seeds into the water for 12 hours.
- Prepare to plant the seed in a small flower pot. Exactly as we described in method 1, under point 3.
- After planting, cover the seed with the substrate and moisten again with water.
- After about 2 – 3 days, the germ should gradually see daylight.
Cannabis seeds do not germinate? These are the most common mistakes:
- The pH of the water is too high or too low. Regardless of the method used to germinate the cannabis seeds, the pH should always be between 5.5 and 6.5.
- The EC value of the water is too high, it should be below 0.8.
- The water temperature was ignored, it should be between 20 ° and 22 ° celsius.
- If you let the hemp seeds germinate into soil, it may be that too much water was used, the soil was fertilized too much, or that the seed was pushed too deep into the soil, or was placed upside down.
- The seeds were exposed to strong temperature differences during transport.
This information is only of interest to customers who live in a country where cultivating and cultivating cannabis seeds is not a violation of the law.