RANDALL BENTON/rbenton@sacbee.com

The invasive weed hems in a boat at the marina. A Tower Park employee said a cluster of day-use boat slips normally used only in summer was abandoned to the plant pest. "It looks like a meadow, and it's still basically covered," she said. Only recently, after persistent January frost, has the weed started dying off for the season. Waterways that were blanketed for months are beginning to clear or are covered in shriveled brown hyacinth leaves killed by the cold.

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