Lower PH with Coffee Grounds test results & research results (Must Read)
SPENT COFFEE GROUNDS are increasingly recommended by professionals and gardeners as a sustainable way to improve your garden soil and provide nutrients to your plants. Claims include improved soil structure, an ideal carbon to nitrogen ratio, improved fertility and provision of nitrogen1.
However!!! …the scientific literature has not sufficiently assessed the impacts on soil and plant production.
Recent research conducted by Dr Stephen Livesley and Sarah Hardgrove from the University of Melbourne, has shown that fresh (uncomposted) spent coffee grounds, applied directly to gardens, can significantly decrease plant growth and development. This article reviews the case for using spent coffee in the garden and describes recent scientific findings and their implications.
Read full study here: