Test the soil pH first
Choose an acidifying amendment based on soil type and plant needs
Apply elemental sulfur to lower pH gradually
Use aluminum sulfate for a faster pH change if appropriate
Mix in peat moss to help acidify soil
Add organic matter such as pine needles, oak leaves, or composted bark
Use acid-forming fertilizers designed for acid-loving plants
Water with rainwater instead of alkaline tap water when possible
Recheck soil pH after treatment
Repeat applications slowly as needed to avoid over-acidifying the soil