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You can use ashes from your wood-burning fireplace or brush pile to enrich your garden. Wood ashes contain most of the essential nutrients plants need to thrive. Knowing how to use ashes as fertilizer lets you recycle waste while helping to grow a luscious garden.
Steps
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Use wood ashes as a soil amendment in the early spring while the soil is dry and before the plant life has begun to actively grow.
- Nearly all plants benefit from the potash content of wood ashes. [1] X Trustworthy Source Royal Horticultural Society Leading gardening charity in the U.K. providing resources for identifying, growing and caring for flowers and other plants Go to source Other components of the ashes are beneficial to the soil and plant growth as well.
- Because the wood ashes act as a liming agent, they reduce the acidity of the soil. [2] X Research source Plants that prefer acidic soil such as blueberries, azaleas or rhododendrons will not thrive if wood ashes are applied.
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Apply 20 pounds (9 kg) of wood ashes per 1000 square feet (93 square m) of soil, tilling them thoroughly into the soil. Leaving the ashes in concentrated piles could cause too much of a salt build-up in areas of the soil that could potentially harm your plants.Advertisement
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Sprinkle ashes upon each layer of your compost pile. The ashes help break down the organic materials as they compost.
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Amend heavy clay soil by using wood ashes because they break up the soil and help it retain more air.
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Deter garden pests by using wood ashes. Sprinkled lightly throughout the garden bed, wood ashes repel maggots, aphids, slugs, snails, and cutworms. Reapply the ashes after heavy rains.
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To keep your ashes where you want them, apply them on a day that is not too windy. Otherwise they're liable to blow away before they have a chance to settle into the soil.
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Use caution when using ashes in the garden. [3] X Research source
- The ashes contain a good amount of lye which is a caustic agent. For this reason, refrain from placing them on young tender plants. Wear gloves when handling the ashes. Use a mask to avoid breathing in the residue and protect your eyes with sunglasses or goggles.
- Avoid using ashes from cardboard, coal or painted wood. These substances contain chemicals that can be harmful to your plants.
- Monitor your soil to be sure it hasn't become too alkaline. Use a soil testing kit to check the PH levels or take a soil sample to your county extension office lab to be evaluated. [4] X Research source Alkaline soil will need sulfur added to it.
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Produce more wood ashes by burning hardwoods rather than soft woods. Hardwoods will make 3 times the amount of ash per cord of wood than soft woods.
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Community Q&A
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QuestionCan I use ash for a yellow rose plant?Community AnswerNo, you should never give ashes to rose plants because they prefer acidic soil. If you use ashes for roses, they may die in the alkaline soil.
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QuestionIs paper ash good for plants and shrubs?Community AnswerIt will be better if you'll use decayed organic matters like leaves or manure, used to improve soil structure and provide nutrients.
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QuestionDoes boiling water remove fluoride?William ShawCommunity AnswerIt is very unlikely that boiling water would remove fluoride from the soil, and cold water would be cheaper. Adding a diluted solution of calcium chloride would effectively remove any ionic fluoride because calcium fluoride is virtually insoluble in water.
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Tips
- Consider adding your urine to the wood ash. A recent study,"Stored Human Urine Supplemented with Wood Ash as Fertilizer in Tomato Cultivation and Its Impacts on Fruit Yield and Quality" (Journal of Agricultural and Food Chemistry, 2009), found that human urine mixed with wood ash led to substantial improvements in the amount of tomatoes that were produced.Thanks
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Warnings
- Avoid mixing wood ashes with fertilizer containing nitrogen. Hazardous ammonia gas could result.Thanks
- Never apply wood ashes to potatoes as they promote potato scab. [5] X Trustworthy Source Royal Horticultural Society Leading gardening charity in the U.K. providing resources for identifying, growing and caring for flowers and other plants Go to sourceThanks
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References
- ↑ https://www.rhs.org.uk/advice/profile?pid=621
- ↑ https://www.canr.msu.edu/news/wood_ash_in_the_garden
- ↑ http://blogs.ifas.ufl.edu/bakerco/2017/10/04/use-wood-ashes-garden-wisely/
- ↑ https://www.bobvila.com/articles/how-to-test-soil-ph/
- ↑ https://www.rhs.org.uk/advice/profile?pid=621
- https://www.firewood-for-life.com/hardwood-vs-softwood.html
- http://www.emmitsburg.net/gardens/articles/frederick/2004/ashes.htm
- http://www.sciencedaily.com/releases/2009/09/090902112750.htm
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Reader Success Stories
- "I now know not to use potash with fertilizer that has nitrogen in it, as it puts off a poisonous gas. Also that hard wood makes 3 times the ash that soft wood does. We are glad we have soft wood to burn. Just trying to find a use for these ashes. " ..." more
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"I now know not to use potash with fertilizer that has nitrogen in it, as it puts off a poisonous gas. Also that hard wood makes 3 times the ash that soft wood does. We are glad we have soft wood to burn. Just trying to find a use for these ashes. "
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"Very informative. Will now use sparingly on veggie patch and grass to keep the deer out. Wonder if it will keep the neighbor's cats out too. Here's to success with fruits and veggies this summer! Many thanks."
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"I burned some wood and branches and wanted to put them to use. It gave me advice but I was wondering if it was good for Hosta plants? I will Google it. Good advice overall."
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"I had an idea--I thought it was original--about using ashes in mulch. And here it is! People really do use ashes as an ingredient in mulch! I need to read about it. :)"
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"This article was helpful in determining which type of ash and which plants to use it on. It also identified ash that could be harmful to my vegetable garden."
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