Be Inspired Blog - Arizona
How Deep Watering Builds Strong Roots for Summer-Ready Plants in the Valley of the Sun
Living in the greater Metro Phoenix area means embracing the challenges of gardening in an arid climate with scorching summer temperatures. One of the most effective strategies for ensuring plant health in our desert environment is deep watering. Unlike shallow, frequent watering, which can lead to weak root systems and water waste, deep watering encourages strong root growth, making plants more resilient to extreme heat.
Why Deep Watering Matters
Summers are notorious for their relentless heat, often exceeding 110°F. When plants receive shallow and frequent watering, their roots remain close to the surface, where moisture evaporates quickly. This leads to weak, drought-prone plants. Deep watering, on the other hand, helps roots penetrate deeper into the soil, accessing moisture reserves that help sustain them through the hottest months.
Benefits of Deep Watering:
- Stronger Root Systems – Encourages roots to grow downward, increasing plant stability and drought resistance.
- Improved Moisture Retention – Allows soil to absorb and hold water longer, reducing the need for frequent watering.
- Healthier Plants – Reduces stress on plants, leading to better growth, flowering, and fruiting.
- Water Conservation – Helps minimize water runoff and evaporation, making each drop count.
Best Practices for Deep Watering in the Valley of the Sun
- Water Slowly and Deeply
Using a drip irrigation system or a soaker hose allows water to seep into the soil gradually rather than running off. Aim to water deeply, reaching at least 12–24 inches below the surface for trees and shrubs and 6–12 inches for smaller plants and vegetables.
- Water Early in the Morning or Late in the Evening
Watering during the cooler parts of the day prevents excessive evaporation, ensuring that moisture reaches the roots where it's needed most.
- Check Soil Moisture
Use a soil probe or a long screwdriver to check how deep the water has penetrated. If the probe easily pushes in up to 12 inches, your watering is effective.
- Adjust Watering Frequency by Plant Type
- Desert-adapted trees & shrubs: Every 7-14 days, deeply.
- Fruit trees & vegetables: Every 3-7 days, depending on weather conditions.
- Flowering plants & annuals: Every 2-5 days during peak heat.
- Mulch to Retain Moisture
Applying a 2–4 inch layer of mulch around plants helps reduce soil temperature, slow evaporation, and maintain consistent moisture levels. Organic mulches like wood chips, straw, or compost are excellent choices.
- Consider a Basin or Berm for Trees and Shrubs
Creating a shallow basin or berm around the base of a tree helps direct water to the root zone and prevents runoff. This is especially useful for young trees that need deep hydration as they establish themselves. Berns work particularly well if flooding the area with a hose.
Signs Your Plants Need Deeper Watering:
- Wilting or drooping leaves, especially in the morning.
- Dry, crumbly soil just below the surface.
- Stunted growth or yellowing foliage.
- Surface roots exposed or drying out.
Summer-Proofing Your Garden
By implementing deep watering techniques, your garden will be better equipped to withstand the Valley’s extreme summer temperatures. Whether you're growing citrus trees, desert natives, vegetables, or flowering plants, a strong root system is the foundation for success.
Adjust your watering habits now, and come summer, your plants will thank you with healthy growth, vibrant blooms, and bountiful harvests.
