Proper Tree Watering in St. Louis: How to Keep Your Trees Healthy in the Summer Heat 

Summers in St. Louis can be brutally hot, with temperatures often soaring into the 90s and beyond. While established trees have deep root systems that help them withstand drought, young trees and recently planted trees are especially vulnerable to heat stress and dry soil. Without proper tree watering and soil moisture monitoring, trees can suffer from wilting, leaf scorch, and even root damage.

To keep your trees thriving through Missouri’s hot summer months, follow these best practices for tree watering and soil moisture management.

How Much Water Do Trees Need? 

The amount of water a tree needs depends on its age, species, and soil conditions. Here’s a general guideline for tree watering in St. Louis:

• Newly Planted Trees (First 2 Years): Need 10-30 gallons of water per week, especially in hot or dry periods. This can vary depending on the size of the tree planted. Also, water the area around the trees much as possible, not just the rootball.
• Young Trees (2-5 Years): Require deep watering every 2-3 days to encourage deep root growth during hot and dry periods.
• Mature Trees (5+ Years): Typically rely on natural rainfall but may need supplemental watering during droughts.

Best Tree Watering Techniques 

To ensure your trees get the moisture they need without overwatering, follow these techniques:

1. Deep Watering vs. Shallow Watering

• Water slowly and deeply to encourage roots to grow downward, rather than staying near the surface.
• Use a soaker hose, drip irrigation, or a slow-release watering bag for newly planted trees.
• Avoid quick surface watering, as it evaporates before reaching the roots.

2. Check Soil Moisture Regularly 

How do you know if your tree needs water? Stick a screwdriver or soil probe 4-6 inches into the soil near the tree’s roots. If the soil is dry and hard, it’s time to water. If it’s still damp, hold off to prevent overwatering.

3. Mulch for Moisture Retention 

Applying a 4-8 inch layer of mulch around the base of the tree (but not touching the trunk--think donut shape, not volcano) helps:
✔️ Retain soil moisture
✔️ Regulate soil temperature
✔️ Reduce water evaporation

Signs Your Tree Needs More Water 

If you notice these symptoms, your tree may be suffering from drought stress:

• Wilting or curling leaves
• Leaves turning yellow or brown (leaf scorch)
• Early leaf drop
• Cracks in the soil around the trees

Need help keeping your trees healthy?

At St. Louis Tree Pros, our ISA Certified Arborists provide expert tree care services in St. Louis, including:
- Tree health assessments to detect drought stress
- Soil moisture testing to prevent over- or under-watering
- Tree mulching and root care for long-term health

Call 314-312-1331, email us at info@stltreepros.com, or request a quote or consultation on our website!

Proper tree watering in St. Louis is essential to keep your landscape beautiful and your trees strong. Monitor soil moisture, water deeply and consistently, and reach out to our experts if you need help! 

From, Your Friends at STL Tree Pros