Answer: Limestone is usually used to raise the pH although it can also help improve soil structure. Quicklime is not usually recommended for garden use and hydrate of lime usually dissolves so quickly that it is of limited value in the garden and may burn plant roots. Ground limestone is what is most commonly used in the garden (and lawn) and is available in powdered or pelleted form. Pelleted lime is less dusty and can be easier to apply. There are two types available: dolomitic and calcic. Dolomitic contains some magnesium which makes this trace element available to plants.
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