(Perennial) come back every year Blue hydrangeas—classic, dreamy, a little dramatic 💙🌸 Here’s the low-down in plain English: What makes hydrangeas blue? It’s soil pH. Acidic soil (pH ~5.2–5.5) → blue flowers Neutral → purple Alkaline → pink So blue isn’t a different plant—it’s chemistry magic. How to keep them blue Use aluminum sulfate (the MVP for blue blooms) Add coffee grounds, pine needles, or peat moss Water with rainwater if you can (tap water is often alkaline) Avoid lime or anything that raises pH ⏳ Heads-up: color change takes weeks to months, not overnight. Best types for blue flowers Not all hydrangeas can turn blue. These can: Hydrangea macrophylla (Bigleaf & Lacecap) ✅ Hydrangea serrata ✅ These stay white no matter what: Panicle (H. paniculata) ❌ Annabelle / arborescens ❌ Light & care basics Morning sun, afternoon shade (they hate harsh heat) Consistent moisture—thirsty plants Mulch to keep roots cool
