South Portland residents Mike McGee and Sue Sturtevant, foreground, bag Japanese knotweed roots at Pope Preserve in Knightville on Saturday, April 30, while David Critchfield, chairman of the city Conservation Commission, works in the background. They and other volunteers replaced the invasive plant with milkweed seedlings, to help create a habitat for monarch butterflies on the coastal property near Ocean and Market streets. (Melanie Sochan / For The Forecaster)

Volunteers planted this milkweed seedling at Pope Preserve in the Knightville neighborhood of South Portland on Saturday to create a habitat for Monarch butterflies. (Melanie Sochan / For The Forecaster)

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