I've been trying to get my Bloomstruck hydrangeas at the front of my house to change colors. I've been using Espoma Soil Acidifier for three years now in hopes of turning them blue or at least a purple. Despite my efforts, they remain hot pink. I would really appreciate any better methods or home remedies that might actually work, including brand recommendations or specific tips.
3 Answers
Have you checked the pH of your soil? It could really help clarify why your hydrangeas aren’t changing color. Ideally, you want it around 5 or lower for blue blooms. If you haven’t tested directly where they are planted, now might be the time to do so!
If Espoma’s sulfur hasn’t worked for three years, you might need to consider repotting them with soil designed for acidity. The soil’s pH can be tricky, and it often requires a significant drop for the color change. Home remedies generally fall short because changing pH isn’t as straightforward as it seems—each pH unit is a tenfold change, so you’ll need a serious adjustment that just throwing some household items won’t accomplish.
After three years, it's definitely worth getting a soil test. Other nutrient levels, like nitrogen and phosphorus, can impact flower color too.