City of Portland, OR

08/10/2023 | News release | Distributed by Public on 08/10/2023 16:35

Caring for Trees is Very Important During Hot Weather!

News Article
Essential Guidance from Portland Parks & Recreation's Urban Forestry Team
August 10, 2023 2:46 pm

(Portland, OR) -

As the temperature soars and the city braces for another heat wave, it is crucial for our community to come together and ensure the well-being of the beloved trees. Trees are not only a vital part of Portland's aesthetic charm but also play a critical role in combating climate change and providing essential shade and habitat. Trees are an investment with long-term benefits, and maintenance and ongoing care will ensure their longevity. Portland Parks & Recreation's Urban Forestry team is pleased to provide information on how to care for trees during scorching hot days.

Three children and an adult shovel dirt to prepare for a young tree to be planted on an overcast Portland day. This was a joint Portland Parks & Recreation / Portland Public Schools tree planting at Sitton School in a recent year.

1. Hydration is Key: Just like humans, trees need water to survive the summer heat. During extended periods of high temperatures, it's important to water trees adequately. Provide a deep, slow watering at the base of the tree to ensure moisture reaches the roots. Water in the early morning or late evening to minimize evaporation. For younger trees, consider using a 5-gallon bucket with several holes drilled in the side at the bottom of the bucket. Fill the bucket and let the water trickle into the soil. Fill the bucket three to four times to supply 15-20 gallons of water per tree.

2. Mulching Matters: Applying a layer of organic mulch around the base of trees can greatly benefit them during hot weather. Mulch helps retain soil moisture, suppress weeds, and regulates soil temperature. Make sure the mulch is spread evenly but keep it three inches away from the tree trunk.

3. Pruning Wisely: During heat waves, avoid pruning as it can stress the tree further.

4. Shielding from the Sun: Young or newly planted trees might need additional protection from the sun's intense heat. Use a shade cloth or burlap to create a temporary shade structure that reduces sun exposure. Remove the shade structure once the temperature drops.

5. Watch for Signs of Stress: Heat stress in trees can appear in ways such as wilting, yellowing leaves, or premature leaf drop. If you notice these signs, take action immediately by providing extra water and care.

6. Know Your Trees: Different tree species have varying tolerance levels to heat and drought.Understanding the specific needs of the trees in your area can help you tailor an effective care routine. Even drought tolerant trees need water in their first three to four summers.

By taking these simple yet effective steps, we can ensure the health and longevity of the urban forest even in the face of extreme weather conditions. For a comprehensive guide on tree care throughout the year, visit

Young trees recently planted on a Portland street. It is important to regularly water and maintain young trees as they establish, and this is particularly true during stretches of hot weather.

About Portland Parks & Recreation's Urban Forestry Department

The mission of PP&R's Urban Forestry department is to manage and care for Portland's forest infrastructure in the city, for current and future generations. Our urban forest consists of 220,000 street trees, 1.2 million park trees, and about 2.9 million private property trees. Urban Forestry is involved in managing or regulating these trees to differing degrees - creating and implementing the City's Urban Forest Management Plan, fostering community tree awareness and stewardship, developing tree policies and programs, monitoring and assessing the urban forest, issuing permits for planting, pruning, and removal of public and some private trees, and responding to tree emergencies.