Volunteers for , a community science program of the 91����Ƶ, make simple observations on a mobile app, in English or Spanish. In the fall, data on color changes and falling leaves provides telling information about plant behavior, about the effect of a changing climate.

The volunteers, or community scientists, can from anywhere in the world, including on the Fall in the Woods walk at the Garden on October 8. Taran Lichtenberger, Budburst community engagement manager, will be there to show people how to use the Budburst app, which is available on or . The event, which starts at 11 a.m., includes a guided walk through McDonald Woods; all ages are welcome on the easy walk.

“The usual examples we have on climate change are really far away from our everyday lives,” said Emma Oschrin, Ph.D., Budburst director. “We might talk about polar bears or melting ice caps, which are very clear examples…but through Budburst, you can learn about climate change quite literally in your own backyard. You can observe the impact of climate change on plants, on organisms right around you.”

Scientists study the data about plant seasonal changes to help them predict how climate change might impact ecosystems decades, or even centuries, into the future. They compare data from recent years to historical data to see how plants are behaving differently and note the impact of climate change.

You don’t need any special equipment or training to become a community scientist. Budburst has more than 31,000 community scientists in all 50 states and abroad. “It’s a real science project that anyone can participate in,” Dr. Oschrin said. “It’s good for young learners, adult learners, gardeners, and leaf peepers —really just anyone who has an interest in plants. That’s usually the entry point.”

Fall is a great time to observe changes in the woods, said Matt Evans, the Garden’s managing ecologist for the woodlands. On the October 8 walk, participants should be able to see fall color in white ash and black walnut trees, and some hues in gray dogwood, hazelnuts and maybe some oaks.

But the recent dry weather, along with the heat, will affect fall color. In dry years, color changes and leaf dropping appear to be happening sooner and more rapidly, he said—precisely the sort of data that Budburst collects.

“It’s important, hands-on science,” Oschrin said. “When you see a plant doing something fun and interesting near you, take a picture, try to identify it, and let us know what you see—is this the beginning of leaf color change or the end? Are the leaves falling off the tree yet? Also, you can participate in Budburst in all seasons, though most people like to track plant changes in the spring and the fall, with so much happening in the plants around them.”

Guided Wood Walks

Fall in the Woods

Why Do Trees Turn Colors?

A walk in the woods

On walks in McDonald Woods, fall color is the shining star, but Joanne Schmitz isn’t so much looking up at the trees. She’s looking down.

“For me, fall is the end of goldenrod time, and it’s aster time in the woods, and pretty soon witch hazels are blooming,” said Schmitz, a 91����Ƶ volunteer. She has helped record seasonal changes in plants since 1979, in the woods and Dixon Prairie.

Schmitz will lead the Fall in the Woods walk on October 8. Yes, she will talk about color changes in the woods and why leaves fall—and how you can help scientists study these changes for , the Garden’s community science program. But she wants people to stop and sense the changes that are happening in the natural world around them.

“It’s a transitional feeling,” she said. “You can feel the crispness in the air, and you’re not sweating as much. Your body senses this change, just like trees sense cooler nights (that help trigger fall color).”

Tracking fall color

Fall color—its vibrancy, duration, and range—depends on weather conditions. In Cook County, the spring drought didn’t help; without a good rain, colors might be less vivid and could show up earlier than usual. To track this season’s foliage, check out the Illinois Department of Tourism’s ; keep an eye out for the 91����Ƶ in the tourism department’s .

Tired of raking up fall leaves? Here are some alternatives.

Calling all plant lovers

If you’re the type to notice monarch butterflies on milkweed or the bloom of spring ephemerals in the woods, then Budburst would love to hear from you.

Budburst’s volunteer community scientists observe and report on plants and pollinators to help scientists understand how our environment is responding to climate change.