lower soil ph cannabis

How 2 Lower PH in Soil..

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i have a ph in my soil of around 7..

i need to know how to get it lowered so i dont hafta worry bout it anymore..

ive posted b4 n no one gave me the right answer i was lookin for..

so hear we go again to see what happens..

thanks for adive..

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All you need to know and then some.

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New Member

i have a ph in my soil of around 7..

i need to know how to get it lowered so i dont hafta worry bout it anymore..

ive posted b4 n no one gave me the right answer i was lookin for..

so hear we go again to see what happens..

thanks for adive..

causes of ph fluctuations and pH facts.

When growing in soil any fertilizer you use can cause an excess build up of salts when it decomposes in the soil. This almost always results in a more acidic soil which stunts the plant’s growth and causes brown foliage. When using a Hydroponics set-up the nutrient solution can very easily cause a fluctuation in the growing reservoir. Other common reasons as to why soil may become too acidic when doing outdoor grows are rainfall, leaching, organic matter decay and a previous harvest of a high yeild crop in the same soil. In dry climates, such as the desert Southwest US, Spain, Australia, etc., irrigation water is often alkaline with a pH above 7. The water in rainy climates, such as the Pacific Northwest of North America, the UK, Netherlands and Northern Europe, is often acidic with a pH below 6. Lightly sandy soils with little clay and organic matter are quicker too become more acidic. Another common mistake is that a grower will mix his soil unevenly, leading to “hot spots” in the growing medium, so mix all ratios as well as you can.

How do I raise/lower my pH?

A great way to regulate the pH of your soil is to use Dolomite Lime(calcium-magnesium carbonate). While growing Cannabis plants in containers, mix one cup of fine dolomite lime for each cubic foot of soil, then lightly water it. After watering, mix it once more and wait a day or two before checking the pH. While growing in an outdoor garden, follow the dolomite lime manufacturers instructions. Dolomite Lime works well because it has a neutral pH rating of 7.0 and tends to keep the soil a constant pH throughout the entire life cycle of the plant. This is a highly recommended method of regulating your soil pH.
If you find the pH of your soil or Hydroponic reservoir to be too acidic or basic you could add either pH up or pH down. These are chemicals sold at places like Home Depot or any Gardening store. They usually come in one liter bottles and are to be diluted in the water used to water the soil growing plants or the Hydroponic reservoir according to directions on the packaging.
Some examples of Home remedies to raise/lower pH are as follows:
1.Lemon juice. 1/4 tbsp can bring a gallon of tap-water from 7.4 to 6.3.
2.Phosphoric acid. lowers pH and provides Phosphor too!
3.Nitric acid. lowers pH.
4.Hydrochloric acid. strongest way to lower pH
5.Hydrated lime. flush soil with a teaspoon per gallon of water to raise pH.
6.Baking Soda. eats acids to raise pH.
7.Calcium carbonate. raises pH (very strong)
8.Potassium silicate. raises pH.
What are signs of a PH fluctuation in my Cannabis plant?
A Cannabis plant can show signs of a pH flux in several ways. The leaves may begin to turn yellow or brown, dry up and/or shrivel on the sides into a straw like shape. Keep in mind however that other deficiencies and disorders may show the same signs of damage, so don’t jump to conclusions until you do some testing and adjusting to your plants and their growing medium.
Some things to remember(I didn’t write these ones)
1.Always test the pH of raw water and drainage water with a pH meter.
2.Raw water pH above 6.0 helps keep fertilizer mixes from becoming too acidic.
3.The pH level is much more important in organic soil gardens than in chemical
hydroponic gardens. The pH dictates the environment of bacteria necessary to the
uptake of organic nutrients.


i have a ph in my soil of around 7.. i need to know how to get it lowered so i dont hafta worry bout it anymore.. ive posted b4 n no one gave me the…

How to Adjust pH When Growing Organic Cannabis

Question: What’s the Best Way to Adjust pH If I’m Growing in Organic Soil?

How do I manage the pH of my soil when growing organically?

More info: I’ve heard that many pH control kits can kill beneficial bacteria in the soil.

I was watering my cannabis plants tonight, and I mixed in a half strength dose of bloom nutes. So I test the PH and it is right in range, about 6.5. When I tested the runoff, it was really acidic at around 5.5.

What am I doing wrong, and how do I correct pH in my organic soil without hurting the micro-organisms the help the roots?


1.) Usually You Don’t Need to Worry About pH When Growing Cannabis With Organic Soil

As long as you’re starting with a good water source, usually you don’t have to think too much about pH during your grow.

However, when growing cannabis in organic soil, some of the most important things happen before you even germinate your plants. The more effort you put into starting with great organic super soil, the less you’ll have to worry about during the actual grow itself. If you’ve set things up properly, pH won’t be a problem for you!

When growing marijuana organically in a super soil environment, there are tiny organisms in the soil that break down nutrients and “feed” them directly to your roots. When you enlist the microorganisms to do the work of making nutrients available to the roots, pH management stops being something you have to do!

When growing organically, you also depend on your soil and the various components to automatically buffer the pH. Starting with the right soil will make things a lot easier for you!

Learn how to make organic super soil (custom-formulated soil for cannabis plants – for those who want to do organic growing the “real” way and just water their plants, without having to worry about pH or giving nutrients)

Unless you are noticing actual symptoms of nutrient lockout (nutrient deficiencies) than pH adjustment is probably not necessary.

Don’t let your nutrients run out!

If you’re starting with regular (non-composted) organic soil, than your plants will quickly use up all the nutrients in the soil and you will either have to transplant to new, fresh soil every 3-4 weeks or supplement with a proven organic nutrient line like the GO box. It’s especially important to make sure your plant doesn’t run out of nutrients in the flowering stage or it will dramatically lower your yields! Once of the cool things about composted soil is the nutrients break down slowly over the course of your grow, giving your plants the right amount of nutrients at the right time.

But if you are using liquid nutrients, it becomes important again to make sure you’re testing the pH of the water going in and out. Even organic liquid nutrients are only readily available to your plants if the pH is in the right range. But since you don’t want to disturb the microorganisms in the soil, try to only actually adjust the pH if you notice pH nutrient problems in your plants.

In general with organic growing, it’s recommended you do not adjust or try to manage pH until you know something is wrong. In organic growing “if it ain’t broke don’t fix it.”

2.) Organic Ways to Adjust pH – For When There’s a Nutrient Problem!

If you’re seeing nutrient problems on your plant, and you know your plant hasn’t used up all the nutrients, the first thing to always check is the pH! Check the pH of the water that’s going into your plant, as well as the runoff water that’s coming out the bottom. In soil you want to maintain a pH of 6-7.

If you do notice nutrient problems, the first thing to do is check the pH of the water going in and out!

If your pH is outside the 6-7 range, you may need to adjust the pH to avoid further nutrient lockout on your cannabis plants. But since you’re growing in organis soil, if you do want to adjust pH, you should use an organic source.

Luckily, there are natural sources of PH Up and PH Down, many of which you can actually find around the house!

Organic “pH Down”

Note: Dolomite Lime acts as a natural pH buffer and will help keep the pH constant when added to your soil during the compost process. It can also help correct acidic soil up to a certain point. If you have just realized your soil pH is too low, try to find powdered dolomite lime, as the larger chunks take longer to break down, though be careful that you don’t add more than instructed, lime is “hot” (has relatively high levels of nutrients) and can burn your plant in too-high doses. The larger chunks should be okay if you’re just looking for a pH buffer.

Using an inorganic pH adjuster (like the pH Up and Down that come with most pH adjustment kits, for example the General Hydroponics pH kit) may actually damage your microherd (beneficial bacteria) and can set your marijuana plants back as far as nutrient breakdown / absorption is concerned.

Learn the best ways to adjust soil pH using purely organic methods. ]]>