Effects of nature (greenspace) on cognitive functioning in school children and adolescents: A systematic review

Many educators notice that students come back from time outside calmer and readier to work. But does a few minutes among trees really help young people focus and learn? And is a quick break enough, or does it take a whole new schoolyard?

Researchers at the University of Melbourne gathered 12 well-designed studies from Europe, the US and Canada, ranging from about 30 to over 2,000 children each. Each study compared young people aged 5 to 18 who spent time somewhere green with similar young people who stayed indoors or in built-up spaces, then tested their focus, memory or learning.

The researchers found:

1. Short green breaks sharpened focus and memory. In Rome, 10-year-olds who played for 30 minutes in a school garden did better on focus and memory tasks than children who played in a paved courtyard. It worked for both organized team games and free play. In Canada and Denmark, children who walked through woods or fields for 30 minutes responded faster and more steadily on attention tests than children who walked in town.
2. Even a view helped. High school students who rested for 10 minutes facing a window onto trees and grass did better on memory tasks than students in a room with no window.
3. Friends made nature breaks better. Teens in London concentrated better after 20 minutes in a grassy area with trees than after time indoors. This held whether they were alone, on their phone or with a friend, but their mood lifted most when a friend was with them.
4. Garden lessons built lasting knowledge. US elementary students who had garden lessons knew more about plants and nutrition one and two years later. Classes with more garden lessons, and more success growing and sharing produce, gained the most.
5. Greener grounds paid off over time. Dutch children whose paved schoolyard was replaced with trees, plants, sand and water worked faster on a thinking task after two years. They also valued their schoolyard more.
6. Teens benefited most consistently. High school students gained from every kind of nature time. Not every skill improved, though. Garden play did not improve impulse control, and in Sweden, outdoor biology lessons helped 7th graders remember more but not 8th graders.

What this means for your practice

Schedule short green breaks before demanding work. The clearest gains came from 10 to 30 minutes outside. A lap of the school garden, a grassy corner or a nearby wooded path is enough.

Don't over-plan it. Structured games, free play and quiet walks all worked. You can let students choose how they spend the time.

Let friends go together. Teens got the biggest mood boost outdoors when they were with a friend. Try pairs or small friendship groups.

Use the green you can see. Seat students facing windows with views of trees, and keep blinds open. A living plant wall also helped younger children focus. Nature center and zoo educators can run indoor sessions in rooms overlooking green space.

Make garden time regular and real. The benefits grew with more lessons and with success growing and sharing food. Plan for crops students can harvest and share.

Combine quick breaks with lasting change. The authors recommend both: short breaks to keep attention fresh, and greener grounds and garden-based curriculum for longer-term benefits. Use these findings to support a schoolyard greening proposal.

Don't save outdoor time for little ones. Teens gained the most consistently. The authors see nature breaks as welcome relief for students under pressure from tests and grades.

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