### **Instructions:**
1. **Mix the Solution:**
Dissolve 1 cup of aluminum sulfate in 1 gallon of water. Stir well until fully dissolved.
2. **Water the Base:**
Pour the solution slowly around the base of the hydrangea. Avoid getting it on leaves or flowers.
3. **Repeat Monthly (if needed):**
For best results, apply once a month during the growing season (spring through early summer).
4. **Monitor Soil pH:**
If you want to be precise, test your soil pH every few weeks. You’re aiming for a pH between 5.2 and 5.5 for deep blue blooms.
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## **A Few Tips to Keep in Mind:**
* Only **bigleaf hydrangeas** (Hydrangea macrophylla and serrata) can change color. White varieties won’t turn blue.
* Don’t overdo it—too much aluminum sulfate can harm your plant.
* If you want **pink hydrangeas**, do the opposite: keep the soil more alkaline by adding garden lime instead.
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### **The Bottom Line**
Nature’s palette is powerful—but with just **one cup of aluminum sulfate**, you can take the reins and give your hydrangeas that beautiful blue glow. It’s a little bit of science, a little bit of magic, and a whole lot of garden charm.
Try it this season and watch your blooms transform before your eyes!
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Let me know if you’d like this turned into a printable or social media version!
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