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Organic Wood ash is an excellent source of lime and potassium for your garden. Not only that, using ashes in the garden also provides many of the trace elements that plants need to thrive. Wood Ash As A Soil Fertilizer: {Good To Know} Wood ashes contain potassium, calcium, phosphorus and magnesium which encourage strong root and stem growth.Rose bushes & shrubs: Treat with 1/2 to 1 pound of wood ash (per year). Most wood ash contains a good percentage, about 25%, calcium carbonate, an ingredient in garden lime.On the other hand, if your soil is neutral or alkaline, to begin with, adding wood ash could raise the pH high enough to interfere with plants ability to take in nutrients. wood ash could raise the pH high enough to interfere with plants ability to take in nutrients. The carbonates and oxides in the ash are valuable liming agents that can raise pH and help neutralize acid soils. Lawns that need lime and potassium also can benefit from wood ash. Apply no more than 10 to 15 pounds of ash per 1,000 square feet of lawn. Wood ash also will add nutrients to compost. Wood ash is also useful for pest control. The salt in the wood ash will kill bothersome pests like snails, slugs and some kinds of soft bodied invertebrates. To use wood ash for pest control, simply sprinkle it around the base of plants being attacked by soft bodied pests. If the ash gets wet, you’ll need to refresh the wood ashes as the water will leach away the salt that makes wood ashes an effective pest control. Another use for ashes in the garden is to change the pH of the soil.