Are Charcoal Ashes Good For Plants? (And How To Use It)

I wanted to learn more about how charcoal ashes affect my plants. I’ve heard old wives tales about using ash in the garden. But, I wanted to know if charcoal ash could truly benefit plants. You can find the results of my research below.

Charcoal ash is good for plants because it contains various nutrients such as calcium, phosphorus, and potassium. It can be used to reduce the pH of the soil in case it’s too alkaline. It can be used when preparing potting soil as it helps retain moisture.

I’ve written a lot more details about charcoal ashes and their benefits in the post below. You will also find information on how to use the charcoal ash in your garden.

Why Charcoal Ashes Are Good For Plants

Turns out, the old tips and tricks you heard from your grandparents are true. Ash from charcoals can benefit your plants in several ways.

Ash is nothing more than the leftover residue from burning your charcoal. While most people toss it out, ash can serve many different purposes. It’s an excellent source of lime and potassium.

Lime alters the pH level of the soil. Not only that, but it can promote the spread of good bacteria. This ultimately creates a more conducive environment for growth.

Meanwhile, potassium can strengthen plants by thickening the cell walls. Potassium also plays a big role in disease resistance and crop yield. This mineral is so important for plant growth that it’s one of the “Big Three” in commercial fertilizers.

Charcoal ash can do a lot to improve soil quality. However, there is one important caveat. You must use charcoal products that are free of additives and chemicals.

Using the Right Charcoal

You will find many different types of charcoal products on the market. Not all of them are going to work in your garden.

Basic charcoal is a black carbon residue. It’s wood that’s cooked in a low-oxygen environment. This drives out all the moisture to create a fuel source that burns at a very high temperature.

Briquettes are similar to charcoal. But, manufacturers produce it using compressed charcoal dust, wood shavings, or pulp. Any charcoal with a uniform shape is a briquette.

Ash from natural charcoal and briquettes are perfectly fine to use in your garden. The problem comes from treated charcoal products.

Many modern grilling products contain chemical additives. You might see products with lighter fluids and other ingredients that help with the cooking process.

Those are the types of charcoal ash you want to avoid. Even though the charcoal is burnt, you still run the risk of adding those chemicals to your garden.

If you want to use charcoal ash, stick to natural products that don’t contain any chemicals.

You can use bbq ash for plants if you’re sure they don’t contain any chemicals that can be harmful for the plants. So make sure to check the package for the ingredients list before using the leftover ash in your garden.

How to Use Charcoal Ashes

You can use charcoal ash in garden in a variety of different ways. Once you gather it from your grill, you can apply it to the soil, use it on your plants, and even toss it in your compost.

Here are some of the most common ways gardeners utilize charcoal ash.

Add to Compost Pile

Charcoal ashes make a wonderful addition to your compost pile. Ash is primarily carbon, which is important for decomposition.

Your compost heap is teeming with microorganisms. There are beneficial bacteria, fungi, and tiny insects. All of those organisms work together to break down carbon-containing organic waste to its simplest form. Once the decomposition process is complete, you’ll have nutrient-rich humus.

Adding charcoal ashes to the mix will only benefit the composting process. The ash will feed the organisms. Think of it as even more organic waste that you can turn into usable compost.

Correct Acidic Soil

If you’re dealing with acidic soil, charcoal ash is a good all-natural amendment. The ash’s trace amounts of potassium and lime make it more alkaline. Adding the alkaline ash will slowly raise the pH balance to neutral levels over time.

The potassium affects chemical reactions deep within the soil. During this process, the pH level rises. Because it happens deep below the surface, it’s at the prime spot for roots to take advantage of the change.

The lime improves soil pH because of its chemical makeup. Lime contains both calcium and magnesium. The two minerals create a more alkaline environment as they break down.

Raising the pH level of your soil takes time. In most cases, the process will not yield noticeable results until after a year or two. But, the change is worth it. High acidity levels affect the way plants absorb nutrients. Neutralizing it will create a garden that’s more conducive to plant growth.

Use for Pest Control

Having issues with garden pests? A generous sprinkling of charcoal ash should take care of that problem in no time. The fine powder pulls moisture from the body of insects.

The lime in charcoal ash also works to suffocate and kill pests. You can apply it dry or mix it up with a gallon of water to use it as a liquid pesticide.

Use as Fertilizer

You can use charcoal ash as fertilizer in the garden because it contains beneficial nutrients and minerals. Just apply it like you would any other fertilizer. Sprinkle the ashes around the soil and work it in.

Do be careful about how much you use. As we mentioned earlier, ash will raise the pH level slowly over time. If you have acid-loving plants, you will encounter some growth issues.

Not only that, but you could overload your plant with potassium. This can change the way your plant uses nitrogen. Over time, the plant may experience nitrogen deficiency, which stunts growth and yellows foliage.

Protect Plants from Frost

Here’s a unique benefit you might not have thought of.

The mineral salts in charcoal ash can lower the freezing point of water in the soil. It’s the same scientific principles behind road salts. Dusting the plant leaves with ash and sprinkling some around the base of the plant can prevent frost damage.

It won’t keep them protected in very frigid temperatures. But if the climate is hovering around the freezing point, the charcoal ash can make a world of difference.

What Plants Benefit From Charcoal Ash?

You can use charcoal ash for plants that need a good source of potassium. So you can use it on flowering and fruiting plants when they start to develop flowers and fruits. Here’s a list of plants that benefit from charcoal ash.

1. Tomatoes: Charcoal ash’s potassium content can enhance fruit development and overall plant health in tomato plants.
2. Peppers: Peppers can thrive with the added potassium and minerals from charcoal ash, promoting strong growth and improved yields.
3. Roses: Charcoal ash can contribute to healthy root development and vibrant blooms in rose plants.
4. Fruit Trees: Fruit-bearing trees like apple, cherry, and peach can benefit from the potassium and minerals present in charcoal ash, supporting fruit production.
5. Flowering Plants: Many flowering plants, such as marigolds and petunias, can benefit from the nutrients in charcoal ash, resulting in brighter and more plentiful blooms.
6. Vegetables: Various vegetables, including beans, cucumbers, and zucchinis, can benefit from the mineral content of charcoal ash, promoting healthy growth.
7. Herbs: Herbs like basil, mint, and oregano can experience improved growth and flavor when provided with the nutrients from charcoal ash.
8. Lawns: Applying charcoal ash to lawns can enhance soil quality, leading to healthier grass growth.
9. Shrubs: Shrubs, such as azaleas and rhododendrons, can benefit from the minerals in charcoal ash, promoting lush foliage and vibrant blooms.

Please remember that excess charcoal ash will alter soil pH causing it to become more alkaline. So it can affect plants that prefer acidic soil such as blueberries, strawberries, azaleas, etc. if you use too much.

Is Kingsford Charcoal Ash Good For Plants?

Yes, Kingsford charcoal ash is good for plants because it provides a good supply of potassium and minerals. The Kingsford charcoal ash is made by burning soft and hard woods such as pine, spruce, hickory, and oak. This charred material is mixed with coal and other components to create the charcoal.

Is Charcoal Ash Good For Grass?

Charcoal ash is good for grass because it has beneficial nutrients such as potassium, phosphorus, magnesium, and minerals that help the grass grow healthy. I would suggest combining it with a nitrogen-rich fertilizer because grass needs a good supply of nitrogen to grow well.

Is Charcoal Ash Acidic Or Alkaline?

Charcoal ash is alkaline so it’s important to avoid using too much. It can alter the pH of the soil making it more alkaline. You could use this to neutralize acidic soils if you have the need to do so. Avoid using it too much for plants such as blueberries and azaleas that need acidic soil.

Is Wood Ash Good for Plants?

Wood ash is the powdery residue left over after burning a fire in a wood stove or campsite. It looks similar to charcoal ash and is often used interchangeably. But, wood ash is the byproduct of burned hydrocarbons.

It has a slightly different chemical composition and nutrient breakdown.

Either way, it’s also good for your garden. Many would argue that it’s better because you don’t have to worry about any chemical additives.

You can use wood ash the same ways you would charcoal ash. It’s particularly useful as a fertilizer. The nutrient breakdown is approximately 10 percent and 1 percent phosphorus.

Phosphorus is another important nutrient in commercial fertilizers. The nutrient is responsible for converting other nutrients into usable energy. It helps the plant store energy and even assists with photosynthesis.

Like charcoal ash, wood ash works well in the compost. It can also raise the pH level of the soil.

You don’t need a ton of ash to make a difference. Only a small amount can change your garden for the better.

Is Paper Ash Good for Plants?

Ash from the burnt paper is nearly identical to ash from wood. After all, the paper is merely wood pulp and other fibers. You can use it on your plants and achieve many of the same benefits.

However, you do need to be careful about the types of paper you use. Manufacturers use chemicals to improve strength and overall resilience. Bleach and chlorine treatments are common as well to create white paper.

You also have to consider any coatings. For example, glossy papers may feature resins and polymers that you don’t want in your garden. Toxic heavy metals are prevalent in the paper industry, too.

There’s also the matter of ink. Large-scale printers might use inks with a range of chemicals and additives. Most inks from laser and inkjet printers are safe, as they contain natural oils. Newsprints are fine as well. But, you might want to err on the side of caution for paper products with a composition you’re not familiar with.

Are Coal Ashes Good For The Garden?

Coal ashes are not good for the garden because it contains toxic chemicals and metals such as chromium, arsenic, lead, copper, cadmium, and mercury. It will harm the plants and pollute the environment if you add it to the soil.