Bringing more trees into cities is essential for better air, cooler temperatures, and a healthier environment. But with space and budget constraints, traditional tree planting can be tough. Enter large caliper bare root trees—a fast, efficient way to plant mature trees in urban areas that’s getting a lot of attention. Here’s why this method is exciting, and what you need to know to make it work.

What Are Large Caliper Bare Root Trees?

Bare root trees are dug up while they’re dormant and have no soil around their roots—just bare roots ready to go into the ground. Large caliper trees are a bit older and bigger, typically 2-3 inches in diameter, meaning they come with a more developed root system. They’re a great option for cities where mature trees can make an immediate impact.

The trick to success with large caliper bare root planting is timing. These trees need to be planted when they’re dormant—usually from late fall to early spring—so they can settle in without stress. If you miss this window and plant them during warmer months, their roots can dry out, and the tree may not thrive.

A black and white illustration of a bare root, balled and burlapped, and container-grown tree.

Why It Works

  1. Budget-Friendly: Large bare root trees are often cheaper to purchase and transport than container-grown trees. Without the heavy soil ball, they’re easier to handle, making them perfect for tight spaces.
  2. Instant Impact: These trees are already bigger and ready to grow, which means quicker canopy coverage and an immediate green boost to urban areas. People get the benefits of shade and cooler temps right away.
  3. Long-Term Benefits: Large trees improve air quality, manage stormwater, and support wildlife—all of which are essential for creating healthier, more sustainable cities.
  4. Urban Resilience: Thanks to their larger root systems, these trees are better equipped to handle city challenges like compacted soil and pollution. A group of people in hard hats and orange vests planting large trees along a street.

Challenges to Keep in Mind

The biggest challenge is the planting window. If you miss it, the trees can struggle. Also, urban soil is often tough, so make sure to properly prep the ground for the best results.

Why It’s Exciting for Cities

Large caliper bare root trees are a fast, cost-effective way to green up cities. They give us the instant benefits of mature trees—like shade and cleaner air—while also tackling the long-term effects of climate change. This method helps cities plant trees that are ready to thrive in urban environments.