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A simple pH soil tester or soil test kit will tell you what plants will love growing in your garden. You will be able to choose from a preference guide for over 400 plants.
Below 7 is acid. 7 is neutral. Above 7 is alkaline.
Add sulphur chips to lower pH.
Add lime to raise pH.
In acid soils, unless growing acid lovers, apply lime every 4 years to keep the soil sweet & encourage worms essential for soil drainage, aeration & material recycling.
Never apply lime to newly manured soil.