Marylanders have an opportunity to see how sap was tapped from trees over time to make maple syrup. Brittany Roger, the manager of school programs at the Irvine Nature Center in Owings Mills, gave 11 News a demonstration of how tribes would tap for sap in the Northeast thousands of years ago. “We can only tap in a time of year when the night temperatures are below freezing and the daytime temperatures above 40,” Roger said.