How To Raise pH In Soil Fast: what to add

In chemistry, pH is a scale which ranges from 1 to 14 and is used to specify how acidic or alkaline a substance is. Acidic solutions have a lower pH, while alkaline – or basic – solutions have a higher pH. If the pH level is exactly 7, such as that of pure water, it’s neutral. A soil with a pH of 6 is ten times more acidic than a soil with a pH of 7- if your soil has a ph of 5 you need to learn how to raise pH in soil fast.

Different types of plants need different levels of soil pH to survive and thrive; plants can only absorb nutrients that are dissolved in water, and if the soil pH is too high, or too low, the needed elements and compounds may remain insoluble or incapable of being dissolved.

Soil pH varies from region to region and one garden to the next. Most plants need a pH that is slightly acidic (between 6.5 and 7) but others – ivy or flowering vines like clematis and jasmine, and dark, leafy, green vegetables as well as cruciferous vegetables, asparagus and squash – prefer slightly alkaline soil conditions and will thrive at pH levels up to 7.5 or 8.

Another reason to increase the pH level of the soil is that if you have lead or other heavy metals that tend to be more mobile in acidic soils, raising the soil pH can make those minerals less mobile, and less likely to be taken up by plants.

Once you’ve chosen what you’ll be planting, it’s best to verify the soil’s current pH level before making any adjustments. If you find your soil pH is too high – read my article How to lower pH in soil fast

How to raise pH in soil fast

To increase the pH level of your soil, you should introduce alkaline material; this is called liming – probably because the most common method of raising the alkalinity of the soil is to add limestone.

There are several ways to raise the soil pH, at various price-points and difficulty levels. Some will work quite quickly, while others may take longer to affect the pH level.

Baking Soda

This is one of the easiest, cost-effective and fastest ways to increase the alkalinity of your soil. Since you probably already have baking soda at home, you will not have to buy any further soil amendments to raise the pH level. Baking soda provides a rather convenient solution – especially if you need a quick fix.

Baking soda is cost effective since in most cases you will not need to buy anything. It also produces almost immediate results; in fact, there can be noticeable changes in the soil pH in less than 24 hours provided you use the baking soda properly.

​If using baking soda to increase the alkalinity of the soil, you will never have to worry about harming it – or the growing plants. The baking soda is far more gentle on the soil than other compounds, and can be applied it even when the plants are already growing.

Although there are more potent liming agents that will offer you long lasting pH changes, they will charge higher which can be uneconomical for your small garden.

Wood Ash

If you’d prefer an organic way to make your soil less acidic, you can sprinkle about 1/2″ of wood ash over the soil and mix it into the soil about a foot deep. While this method can be highly effective if done properly, it’s easy to oversaturate the soil with ash; in fact, if you add more than 2 pounds of wood ash per 100 square feet of soil per year, you risk interfering with plants’ ability to take in nutrients.

If you want to raise soil pH significantly, then it is best to introduce wood ash very early on, before planting, and not rush the process. You should plan periodic, small applications over several years, but it can be very effective, as well as a great way to recycle fireplace ashes!

Oyster Shell Lime

This finely ground soil amendment is entirely organic as it’s composed of oyster shells from the seafood industry. As it can contain up to 39% calcium, oyster shell lime can be used to correct calcium deficiencies while raising pH levels.

This product breaks down very quickly and is far safer for plant health – and human health – than hydrated lime products. You should apply 2-4 tablespoons of oyster shell lime per plant or 50 lbs per 1,000 square feet, depending on your original soil analysis and the requirement of your chosen crop.

Eggshells

Dried and pulverized eggshells can be an excellent soil additive; this kitchen by-product is an excellent source of calcium. It will also reduce the acidity of your soil if 1-2 pounds per square foot are added.

Dolomite Lime

Also known as calcium magnesium carbonate, dolomitic limestone is one of the most common soil amendments for raising soil pH and is used by both organic and conventional farmers. It should not, however, be used in soils with adequate or excess magnesium.

While plants need magnesium in small amounts, excess magnesium can stunt plant growth and kill vegetables. Should a soil test indicate that the soil contains adequate or high magnesium levels, use an alternate calcium source for changing soil pH.

Agricultural Lime

This soil additive is made from pulverized limestone or chalk and, while its primary active component is calcium carbonate, additional chemicals found within the compound will vary depending on the mineral source but might include calcium oxide, magnesium oxide, and magnesium carbonate.  

Unlike other types of lime such as quicklime (calcium oxide) or slaked lime (calcium hydroxide), powdered limestone does not need to be burned in a lime kiln; it only requires milling.

Hydrated lime

Hydrated pulverized limestone is the fastest-acting alkaline soil amendment, but it is extremely easy to overdose. It can burn plant roots easily and should be avoided by all but the most seasoned gardeners.

As with all lime products, hydrated lime will work much better if it can be worked down into the soil, rather than left on top. This is yet another reason why an application of lime to lawns is often paired with core aeration and fall watering.

Recommended products to raise soil pH

I have chosen a list of different types of liming products below which will all raise the pH of your soil – you must choose the one which suits your soils needs best. For example if you have high magnesium content in your soil it is best to choose a calcium carbonate product rather than a magnesium carbonate product. I have included small and large bags for you to choose from depending on the area you need to cover.

Dolomite Lime Plus Magnesium and Calcium"Greenway Biotech Brand" 20 Pounds

$34.99  in stock
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Features

  • 20 Pounds of Organic Dolomite Lime Powder Plus 11.8% Magnesium and 22.7% Calcium
  • Helps to Adjust the pH Level
  • Natural & Organic Source of Calcium and Magnesium to Restore the Essential Plant Secondary Nutrients
  • Great to Make your Own Compost and Worm Bins
  • Greenway Biotech, Inc. Brand

Dolomite Lime Plus Magnesium and Calcium"Greenway Biotech Brand" 50 Pounds

$79.99  in stock
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Features

  • 50 Pounds of Organic Dolomite Lime Powder Plus 11.8% Magnesium and 22.7% Calcium
  • Helps to Adjust the pH Level
  • Natural & Organic Source of Calcium and Magnesium to Restore the Essential Plant Secondary Nutrients
  • Great to Make your Own Compost and Worm Bins
  • Greenway Biotech, Inc. Brand

Bonide Chemical Number-5 Hydrated Lime for Soil - 5 Pounds

$7.99  in stock
21 new from $7.81
Free shipping
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Features

  • Quickly raises soil pH, neutralizes soil acidity and provides Calcium
  • Improves soil structure
  • Not for sale in IA

Bonide Chemical Number-10 Hydrated Lime for Soil - 979

$21.55  in stock
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Features

  • Quickly raises soil pH, neutralizes soil acidity and provides Calcium
  • Improves soil structure
  • Not for sale in IA

Oldcastle Stone Products Hydrated Lime Bag 50 Lb.

$63.04
$40.97  in stock
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Features

  • 50 Lb bag
  • Multipurpose hydrated lime is a fast acting concentrated acid neutralizer for flowers and vegetable gardens
  • Corrects soil pH
  • Odor control for animal dwellings
  • Absorbs excess moisture

Jobe's Organics Garden Lime Soil Amendment, 6 lb

$4.87  in stock
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Features

  • Organic granular for increasing soils alkalinity, pH; Low pH can cause poor fertilizer response and soil structure
  • Most plants grow well in a pH between 6 and 7, with 6.5-6.8 being ideal; Below 6.0 many nutrients cannot be absorbed
  • Adding garden lime will increase the pH and make those nutrients available again; Test soil pH before applying
  • Helps plants like hydrangeas turn pink; Creates a healthier, better-producing plant
  • Easy pour 6 pound bag; Apply at planting, reapply 2-3 times a year to maintain desired soil pH

Encap 10612-6 Fast Acting Lime Pouch, 2.5 Pounds, 400-Square Feet

$13.29
$12.51  in stock
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Features

  • Fast acting lime pouch
  • The small, uniform granule size goes to work quickly and provides more consistent coverage
  • Easy to apply with any standard spreader or right from the pouch
  • Helps repair the affects of animal urine spots
  • This product contains approximately 2.5 pounds

Milliard 5lbs Baking Soda/Sodium Bicarbonate USP - 5 Pound Bulk Resealable Bag

$11.99  in stock
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Features

  • Made from anhydrous pure powdered sodium bicarbonate with no additives or preservatives.
  • Use as a cleansing booster with your laundry or dish detergent, as a pH buffer in swimming pools, or for cleaning kitchen surfaces.
  • A natural antigen against bacterial and fungal growth, as well as an effective pest deterrent, sodium bicarbonate can be used for a variety of things from deodorizing refrigerators to scrubbing vegetables.
  • Non-perishable. Packaged in resealable bag to preserve freshness. Store away from light, heat, or humidity for longest shelf life.
  • Odorless, opaque white powder. Available in 2 lb., 5 lb., 10 lb., and 50 lb. packages.

Bicarbonate of Soda---50Lb Bag

$65.00
$59.00  in stock
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Features

  • OMRI Organic
  • Bulk Size
  • Great for Cleaning, Laundry, Livestock, Cosmetics, and Consumption
  • Great alternative for PH UP in the garden
  • Pure

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