How to Use Wood Ash As a Fertilizer


Wood ash is the powdery substance leftover after burning firewood. While most people dispose of the ash in the trash can, others place it in their garden to use as a fertilizer. While wood ash should not be used in large quantities, small amounts can adjust the soil acidity and provide potassium. According to the University of California, wood ash contains five to seven percent of potassium and approximately two percent of phosphorous. The best time to spread wood ash as fertilizer is in the fall.

Things You'll Need

  • Garden tiller
  • Broom
  • Shovel
  • Wood ash
  • Bow rake
  • Garden hose
  • Position a garden tiller at the edge of the desired planting area and set the blade depth to between five and six inches. Turn the tiller on and push it over the chosen area to dig up the soil.

  • Sweep the ashes out of your fireplace, or use a shovel to collect them from outdoor wood-burning pits or fire pits.

  • Spread the ashes over the tilled area at a rate of five to 10 lbs. per 100 square feet of space.

  • Rake the planting area with a bow rake to mix the wood ash into the soil well.

  • Allow the planting area to sit undisturbed for at least three to four weeks before planting in it.

Tips & Warnings

  • If desired, you can fertilize plants that are already in the ground by applying the wood ash on top of the ground near the plant. Spread it in a circle approximately six to 12 inches from the base of the plants. Rinse the leaves of the plants with a garden hose after the wood ash application.
  • Do not apply wood ash as fertilizer more than once per year.

Related Searches


  • Photo Credit Susie Cushner/Digital Vision/Getty Images
Promoted By Zergnet


You May Also Like

  • Fireplace Ashes & Composting

    Fireplace ash can be added to compost piles or directly to gardens as a soil amendment or addition. The process adds the...

  • How to Use Urea as Fertilizer

    Urea has several agricultural uses, but homeowners turn to this synthetic fertilizer when lawns and gardens lack the nitrogen needed for healthy...

  • How to Use Fireplace Ashes for Tree Fertilizer

    Many people are surprised to learn that fireplace ashes make a very good fertilizer for plants and trees. Because the ash is...

  • How to Burn White Ash Wood

    The low moisture content of white ash makes it an ideal firewood. White ash wood is known for its versatility and will...

  • Is Wood Ash Good for Plants?

    Wood ash is an old-fashioned fertilizer that is high in calcium carbonate and helps alkalize soil. Plants that need a higher pH...

Related Searches

Check It Out

How to Make a Vertical Clay Pot Garden

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!