Renata Brown of the Cleveland Botanical Garden kneels next to a bed of Emperor Red Tulips that were just starting to poke out of the ground. The tulip patch is part of an online educational effort that lets children track spring's arrival.

AKRON, Ohio — When Renata Brown checks on the progress of a patch of tulips at Cleveland Botanical Garden, schoolchildren across the Northern Hemisphere are watching.

Brown is a participant in Journey North’s tulip test garden project, an online educational effort that lets children track spring’s arrival across the hemisphere and teaches them about seasonal changes, climate and geography.

The concept is simple: Volunteers scattered across the United States and a few countries in Eurasia plant the same type of tulip bulbs and then monitor and report on the plants’ growth. Tulips were chosen because they’re one of the few plants that can be grown just about everywhere in North America. The volunteers’ dispatches are tracked on a map on the Journey North website, so children can watch the season’s progression throughout the country and beyond.

Many of the gardens are at schools, but other institutions and individuals participate, too.

This is the first year Cleveland Botanical Garden has been part of the project. Brown, the garden’s vice president of education, planted tulips last fall at its Hershey Children’s Garden and at three urban farms tended by the teenage participants in its Green Corps program.

Staff members monitored the tulips’ early progress, Brown said, because the children’s garden was closed for the season.

Nevertheless, she’s hoping to get the garden’s young visitors engaged in the project. She might urge the children to compare the progress of bulbs planted one year to bulbs planted the next, she said, or perhaps involve the kids in tracking data over a long period of years as a way of seeing climate trends.

The tulip watch is just one of the citizen science projects overseen by Journey North (www.learner.org/jnorth), a program that helps children study wildlife migration and seasonal change. It’s operated by Annenberg Learner, a division of the Annenberg Foundation.

Journey North started in 1994, and the tulip test gardens were one of its first projects, said Mary Hosier, a Cleveland Heights, Ohio, resident and a writer for the program.

She said the tulip project reaches more than 1 million students annually. The number of gardens varies each year, but about 450 have been planted this year, she said.

Those gardens cover much of the United States, reaching as far south as Florida. There are a few gardens in Germany, Russia, Denmark and England.

This year, participating gardeners planted Red Emperor tulips.

The gardeners are required to plant fresh bulbs to control the tests, Hosier said. Otherwise, an older bulb might come up earlier than a new one.