Dre Campbell Farm
Wood Ash in Garden: 11 Practical Uses

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11 Wood Ash Garden Benefits and Uses

One of the places wood ash is most versatile is in the garden. Commonly used as a soil amendment, it contains calcium, potassium, and other minor nutrients.

Ash is the powdery residue that you see in the fire pit after burning wood [1]. If you don’t burn wood for heat, gathering an outdoor pile of dry sticks and burning it is all it takes to make wood ash.

Below are the benefits of using fireplace ashes in the garden — for plants, soil, and livestock.

1. Natural Fertilizer

Plants need a variety of essential nutrients to thrive. Some of these can be found within wood ash. To effectively use as fertilizer, add 10-15 pounds of ashes per 1,000 square feet of soil.

Wood ash is good for asparagus, leeks, and beet. Tomatoes, roses, and fruit trees will also benefit because of the potash it contains.

2. Add to Compost

A healthy compost pile is what gardeners look towards, and the addition of small amounts of ashes will make a marked difference in this garden staple.

The smell of it also becomes a deterrent to wildlife like bears who would otherwise consider the compost a free buffet.

Check the middle of the compost before adding the ashes, and again a month later. You should find the center contains greater numbers of worms and insects working hard.

3. Lime Substitute

You can use it as a substitute for lime. Lime is used agriculturally to raise soil ph.

Instead of paying for garden lime at the farm store, make good use of your fireplace ashes instead. It is good for your garden, trees, and grass.

4. Slug Repellant

Insects like snails and slugs move around underground with greater ease when the soil contains more moisture. When the slime and fluid that allows them to easily navigate surfaces is absorbed, it makes free movement difficult.

Ashes will soak up moisture when applied to a damp surface, so the theory is that slugs and snails will be repelled from plants and soil treated with it. As a result, they’ll have to look somewhere else for their next meal.

5. Raises Soil pH Levels

The magic happens thanks to the calcium it contains, which raises soil pH. However, you will need to replenish after heavy rain.

6. Prevents Blossom End Rot

Blossom end rot occurs while fruits are still green or when ripening begins and often shows on crops like tomatoes, squash, and peppers.

Plants with visible signs of this disorder require higher levels of calcium to prevent the problem from recurring. Therefore, mixing in some fire pit ashes after soil testing could be beneficial in this case as it contains calcium.

7. Prevent Frost Damage

Certain crops are not ready for harvest until the time is getting close to frost. Depending on the area you live in, early frosts may be a concern.

If you want to protect your plants and give them the additional time they need to mature, try applying a light dusting of wood ash over them.

The mineral salts it contains help lower the freezing point of water without causing damage to the plant’s tissues.

8. Dust-Bathe Chickens

Anyone with chickens knows just how much they enjoy taking a bath in the dust. It is their only way of keeping clean, meaning they also require dust.

You can easily make a bathing box for your chickens and set it inside the coop, or outside from the rain. Use either sand or soil and mix in some of this substance.

Burn ash will also deter parasites like lice, fleas, and mites.

9. Freshen Up Chicken Coop

Since it is alkaline, when sprinkled throughout a chicken coop it assists in neutralizing poop odors. The same principle applies to baking soda when you use it around the home or to keep odors out of refrigerators.

This powdery residue also keeps away many parasites that could otherwise be a nuisance in the chicken coop and on the farm.

10. Ant Repellant

Many people are looking for non-toxic ways to get rid of ants from their gardens and homes. Hardwood ash can help.

Place a thick layer over the opening to ant hills in your yard and garden and near cracks they use to enter the house. Check daily to make sure the holes are still covered. If not, simply reapply.

The ants will get tired of digging out their hole daily and will move on to easier quarters.

11. Chicken Feed Supplement

A free and natural way to give your chickens more calcium and potassium is to add ashes into their food. Only a small amount is needed — less than a 1% ratio.

By doing this, it is possible that manure smells may also be reduced, and that a hen’s laying capabilities are extended longer than normal.

You can also add small amounts of charcoal into chicken waterers. Not only will it filter the water and reduce odors, but it will also absorb toxins.

12. Repels Cucumber Beetles

Make a spray by combining a handful of fire ash in a gallon of water. Use it to spray your cucumbers and other cucurbits to keep away cucumber beetles.

Plants That Like Wood Ashes

Plants are unable to flourish without certain minerals. When mineral deficiencies exist, plants suffer. Common signs that your plants may be mineral deficient include yellowing and curling of the leaves, stunted growth, and eventual death.

Vegetables like artichokes, cauliflower, chives, and greens like arugula, spinach, lettuce, and collards do well with garden ashes. However, strawberries, carrots, blueberries, onions, potatoes, and peppers will not thank you for your efforts because they thrive best in mildly acidic soil.

When it comes to flower gardens, especially those planted for bees, some plants that would not mind a helping hand include lavender, hydrangeas, peonies, and roses.

However, before adding it to plants or the surrounding soil, purchase an inexpensive soil test kit and check the ph. Firewood ash is not good for rhododendrons, marigolds, nasturtiums, and azaleas as these are acid-loving plants.

Essential Nutrients it Contains

Most people would be surprised to learn just how many nutrients are contained within wood stove ashes [2]. Far from being a waste product that needs disposal, it has true value around the home and garden.

When referring to plants, ashes contain four important and needed minerals:

  • Phosphorous
  • Calcium
  • Potassium
  • Magnesium

Some soils naturally lack these minerals in abundance, while others need fortification.

Also found in it are minerals like sodium and magnesium. In much smaller amounts you will also find copper, boron, sulfur, zinc, and molybdenum.

While it seems to have a bit of everything, one item it lacks is nitrogen. Areas that have consistently nitrogen-poor soil, a specialty supplement, or fertilizer could be needed.


Now that you know what to do with wood ash, find a storage spot to keep it dry during the winter. By the time spring arrives, you should have a decent supply set aside to use in the garden and on your lawn.

Sasha Brown

Blogger and lover of all things natural.

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