Entrepreneurs tap rich-flowing maple syrup in Vt.

Caleb Kenna for the boston globe

Adam Parke's sugarhouse in Barton, Vt.

Caleb Kenna for the boston globe

Old maple syrup cans in Adam Parke's sugarhouse in Barton.

Caleb Kenna for the boston globe

Tim Menard, far left, Todd Scelza, center, and Adam Parke, run a hose for sap from collecting tanks to the truck bound for the sugarhouse in Barton.

Caleb Kenna for the boston globe

Todd Scelza, right, and Ozzie Henchel prepare a filter press for the first run of syrup at Adam Parke's sugarhouse in Barton.

Caleb Kenna for the boston globe

Todd Scelza of Shadow Lake Maples checked the boiling sap in Barton, Vermont.

Caleb Kenna for the boston globe

Adam Parke, right, and Todd Scelza, left, operate Shadow Lake Maples maple sugaring in Glover and Barton, Vermont.

Caleb Kenna for the boston globe

Galen Parke and Todd Scelza prepare the sugarhouse in Barton.

Caleb Kenna for the boston globe

Adam Parke, right, and Todd Scelza, left, pour off and test the first maple syrup of the season.