what temperature onions need to grow
Check the temperature of the greenhouse. Green onions are a cool-season crop that grow best when the temperature ranges from 55 to 75 degrees Fahrenheit.Sweet and dry onions thrive at this temperature before the bulbs form.. Check the temperature of the greenhouse. Green onions are a cool-season crop that grow best when the temperature ranges from 55 to 75 degrees Fahrenheit. Sweet and dry onions thrive at this temperature before the bulbs form.