Hibiscus plants need slightly acidic soil to thrive. With slightly acidic soil, these plants are better able to absorb nutrients. The American Hibiscus Society recommends maintaining the soil at a pH of about 6 to 7. Using an acid-loving plant fertilizer designed to lower pH, such as one containing ammonium sulphate, is one way to improve soil conditions for a hibiscus. However, you can also use inexpensive household vinegar as a way to lower the pH of the soil.
Using Vinegar for Hibiscus
Mix 1 cup of vinegar with a gallon of water in a bucket. Use this to water the soil directly around the roots of the hibiscus plant. How often you need to do this will depend on your soil conditions. Regular testing of the soil with a soil test kit will help you determine when the plant needs more vinegar. Do not get any of the vinegar and water solution onto the plant. The vinegar will burn any parts of the plant it touches.
- Comstock Images/Comstock/Getty Images