News & Updates

A honeybee and a bumblebee circle the flowers of an American linden tree.

June 29 2026

Why Pollinators Need Trees, Too

Have you heard the latest buzz? Last week was National Pollinator Week, an annual celebration to honor and raise awareness […]

Looking up at a tree canopy and the summer sun

June 22 2026

The Science of the Seasons: Summer Phenology

This article is part of a recurring series in collaboration with Bartlett Tree Experts on the seasonal expressions of phenology […]

Top of a tree of heaven.

June 8 2026

Tree of Heaven: The Invasive That’s Probably in Your Backyard

Smelling like burnt peanut butter, crowding out native species, and playing host to one of the most notorious invasive insects […]

Dog-day cicada on a branch.

August 4 2025

The Cicadas are Coming (but not to DC)!

Shadows casting on a building

July 28 2025

Seeking Shade in American Cities

Four unripe pawpaw fruit hanging from a tree

July 28 2025

Get Ready for Pawpaw Season!

July 21 2025

Mapping DC’s Most and Least Shaded Neighborhoods

Elliot in June watering a young street tree

July 21 2025

One Kid’s Mission to Water All the Trees in His Neighborhood

Students stand in a circle at the National Arboretum

June 30 2025

Cultivating Tomorrow’s Environmental Champions Through Outdoor Education

June 20 2025

Public Testimony | June 13, 2025 | Committee on Transportation & the Environment

a team of volunteers drops mulch at a volunteer event in Emery Heights Park

June 16 2025

Summer Is Here! Check Out Our Upcoming Events

June 11 2025

Public Testimony | June 2, 2025 | Committee on Transportation & the Environment

June 9 2025

Casey Trees and Bartlett Tree Experts, A Crowning Partnership Made in the Shade (of Urban Trees)

Boulder Bridge at Rock Creek Park

June 2 2025

DC Is Hot and Humid – But Is It Really a Swamp?

Two students dig a hole as they learn how trees are planted

June 2 2025

“Best Day of My Life”: Highlights From School Tree Planting Season

A team of volunteers pause digging to pose for a photo with their shovels at the Armed Forces Retirement Home

May 19 2025

Looking Back on Our Final Community Tree Planting of the Season

May 19 2025

Beyond No-Mow May: Transforming Lawns into Lush Gardens and Tree Havens

May 12 2025

Talking Urban Tree Selection with the GardenDC Podcast

Two volunteers apply fresh mulch to a young tree

May 12 2025

Things to Do in June For Trees & Community

May 5 2025

Sign up for a Nature Summer Camp with Casey Trees

DC Climate Week at Sycamore & Oak

May 5 2025

Highlights from DC Climate Week 2025

Casey Trees staff installing a garden

May 5 2025

Tour the Casey Trees Ecological Garden Program

A graphic that says

April 28 2025

DC’s 2024 Tree Report Card is Here

Canopy Awards Honorees and Staff 2025

April 28 2025

An Evening Celebrating Tree Champions

April 28 2025

Planet Protectors: Spring Break Camp Fosters the Next Generation of Environmental Advocates🌳🌟

A group of students walk toward a large tree

April 21 2025

How You Can Help DC’s Trees Thrive—on Earth Day and Every Day

April 21 2025

Videos: Get to Know Our 2025 Canopy Award Honorees