How can i make my soil more acidic? Find out which plants need acidic soil and how to test and adjust your soil ph. Learn how to lower the ph of your soil with vinegar, sulfur, compost tea, lemon juice, and other organic methods. · if your soil isnt acidic enough, or has been heavily treated with lime, here are some methods for increasing the acidity slightly in order to keep your acid -loving plants happily growing. How to make homemade compost more acidic? Find out why acidic soil is beneficial for some plants and how to test it at home. How do you acidify a garden? For instance, naturally sourced substances like sulfur and vinegar can increase a garden’s soil acidity over time. · i’ve learned through experience that soils with a ph below 7 are considered acidic , and numerous common organic materials can lower soil ph safely and effectively. · learn why and how to lower your soil ph with organic and inorganic materials.