This Summer: Keep the Right Plants Hydrated Without Overwatering

Dec 20, 2024

The Australian summer can bring intense heatwaves and prolonged dry spells, which challenge even the most experienced landscapers and horticulturalists. Whether you’re working on a commercial landscaping project, maintaining council grounds, or creating green spaces for private clients, understanding how to strike the right balance of hydration for plants is critical.

Below are key strategies to ensure plants thrive during extreme heat without succumbing to overwatering. Now, you may already be across this as an experienced professional, but it’s always a good reminder! And for newcomer’s, take heed!

1. Water Efficiently

  • Timing Matters: Water early in the morning or late in the evening when temperatures are cooler. This reduces evaporation and allows the water to soak deep into the soil, reaching the roots.
  • Use Drip Irrigation: Drip irrigation systems deliver water directly to the roots, minimising waste and ensuring plants get the moisture they need without oversaturating the soil.
  • Focus on the Root Zone: Avoid overhead watering as it can evaporate quickly in the summer heat and may encourage fungal growth.

2. Mulching for Moisture Retention

Applying mulch around plants is one of the simplest and most effective ways to keep the soil cool and moist.

  • Choose Organic Mulch: Materials such as bark, straw, or wood chips provide excellent insulation and reduce evaporation.
  • Maintain Thickness: Aim for a layer of 5–10 cm of mulch around the base of the plants. Be mindful not to let mulch touch the plant stems to avoid root rot.

3. Select Heat-Tolerant and Drought-Resistant Plants

Choosing plants that naturally thrive in hot and dry conditions will significantly reduce maintenance and water requirements.

  • Native Species: Australian natives like Callistemon (Bottlebrush), Eucalyptus, and Banksia are well-suited to hot climates and require less water once established.
  • Tropical Understory Options: Plants such as Cordyline fruticosa and Alpinia nutans can bring lush green aesthetics while adapting to summer heat when shaded.
native plants

4. Understand When to Water

Overwatering can be just as detrimental as underwatering, especially during summer. Signs of overwatering include wilting leaves, yellowing foliage, and fungal issues.

  • Check Soil Moisture: Use a soil moisture meter or simply check the soil by hand. If the top 2–3 cm feels dry, it’s time to water.
  • Hydrate Deeply, Less Often: Deep watering encourages root growth, which helps plants become more resilient to heat stress.

5. Provide Shade and Wind Protection

In addition to proper watering, temporary shade structures or strategic planting of larger trees can protect delicate plants from the harsh midday sun. Wind can also accelerate water loss, so consider barriers like hedges or screens.

6. Monitor and Adjust

No two summers are the same, so it’s essential to monitor plants regularly and adjust watering schedules as needed. During prolonged heat, sensitive plants may require additional attention.

For landscapers, local councils, and property developers, the health of plants during summer reflects on the overall success of projects. By adopting these strategies, you can ensure your landscapes remain robust, beautiful, and sustainable despite challenging weather conditions.