How to Add Ashes to Your Garden It's important to use ashes in moderation in a garden. Too much and you could harm your plants; too little and you might not see any benefits. As a general rule of ...

As a fertilizer, wood ash potash (K) runs about 7% to 10%. Phosphorus is about 1 1/2 %. Nitrogen, another major nutrient, is released as a gas during combustion so it is no longer present in ashes ...

Brian Jervis Ask a Master Gardener Jul 7, 2023 Updated Aug 11, 2024 0 ...

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Apply wood ashes sparingly, no more than 20 pounds per 1,000 square feet of garden area, to avoid overwhelming the soil with alkalinity and nutrients.

Fireplace ashes tend to have a pH of between 11 and 12. Adding fireplace ashes can raise your soil pH to the point your plants will have difficulty growing in your garden.

Perhaps the first question is whether your garden or landscape is acidic and even needs the pH raised. I guarantee no one will know by looking at it. Testing your soil for pH would be the first step ...