- Hydrangeas: In soil with a pH of 5.2-5.5, hydrangeas are likely to produce blue blossoms. If you prefer pink blossoms, you will need to raise your soil’s pH to 6.0-6.2. - Lavender: Lavender planted in more acidic soil probably won’t die immediately; however, it is unlikely to live long.
- Step 1: Test Your Soil Quality - Step 2: Choose Your Additive - Step 3: Measure & Mix - Step 4: Monitor & Maintain
If alkaline contributors such as limestone are naturally present beneath the soil, it will be challenging to decrease soil alkalinity.
For gardeners growing on a smaller scale, you can use vinegar to make the soil more acidic (use the guiding ratio of 1 gallon of water to 1 cup of vinegar, adjusting depending on how alkaline your soil is). This method will require much more frequent reapplication.