Yes, in English, you can say "planting trees" in reference to tree planting during the Qingming Festival. The Qingming Festival, also known as Tomb-Sweeping Day, is indeed a time when many people participate in tree planting activities to honor their ancestors and to contribute to environmental protection. So, a sentence in English might be:

"We plant trees during the Qingming Festival to honor our ancestors and care for the environment."
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