Originating from Japan, China, and Korea, the hydrangea is a favourite for gardeners worldwide. These lush, flowering shrubs are famed for their large, pom-pom-like blooms in colours that range from pastel pinks and blues to pure whites and vibrant purples. What’s truly fascinating is their colour-changing ability; wide hydrangea varieties alter their hues based on soil pH, giving you a chance to play gardener and scientist all at once!

Hydrangeas aren’t just a pretty face; they bring texture, elegance, and seasonal vibrancy to gardens and patios.

General Care for Hydrangeas

Light

Hydrangeas prefer morning sun and afternoon shade, especially in Australia’s hotter regions. Too much direct sunlight can scorch their delicate blooms, while too little light may stunt their growth. Position them in dappled shade for best results.

Water

Consistent watering is key to hydrangea happiness. They love moisture but hate waterlogged roots, so aim for deep, regular watering, especially during dry spells. A layer of mulch around the base helps retain soil moisture.

Humidity

Hydrangeas enjoy moderate humidity levels. If you’re in a dry area, misting can help, but focus on maintaining soil moisture as a priority.

Soil

Hydrangeas thrive in well-draining, nutrient-rich soil. For colour enthusiasts, altering the soil pH offers a fun twist: acidic soil (pH below 6) produces blue flowers, while alkaline soil (pH above 7) results in pink blooms. Add sulphur for blues or lime for pinks!

Best Suited For

Hydrangeas are best suited for outdoor gardens, but they can thrive in containers on patios or balconies.

Common Problems and Solutions

1. Wilting Leaves or Flowers
   • Cause: Underwatering or overwatering.
   • Solution: Check soil moisture regularly. Water deeply but ensure good drainage.
2. Brown Leaf Edges
   • Cause: Too much direct sunlight or dry winds.
   • Solution: Relocate to a spot with filtered light and protect from harsh wind exposure.
3. Powdery Mildew
   • Cause: High humidity and poor air circulation.
   • Solution: Space plants to improve airflow and treat with a fungicide if needed.
4. No Flowers
   • Cause: Incorrect pruning or inadequate sunlight.
   • Solution: Avoid pruning in late summer as hydrangeas bloom on old wood. Ensure they receive enough morning light.

Three Fun Facts About Hydrangeas

1. Natural Litmus Test: Hydrangeas can act as a natural pH indicator. Their flower colour shifts with soil acidity, making them one of nature’s coolest chemistry experiments!
2. Long Lifespan: With proper care, hydrangeas can thrive for decades, becoming a long-lasting feature in your garden.
3. Symbol of Gratitude: Hydrangeas symbolize gratitude and heartfelt emotions in various cultures, making them a popular gift for special occasions.

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