Making Maple Syrup ReviewOnline version Review for the maple syrup unit. by Haley Clayton Miss 1 Turning sap to syrup 2 Sap becomes syrup when 3 How do you know when to tap a maple tree? 4 What makes the sap flow? 5 Benefits of maple syrup gathering all of the sap boiling the sap waiting for the sap to evaporate into syrup it reaches 219 degrees Fahrenheit it is 2/3 syrup and 1/3 water The tree is at least 45 years old It is at least 12 inches in diameter Warm, sunny days (above 40 degrees) Nights below freezing Natural sweetener Contains Vitamin C