how to grow spring onions in greenhouse
To successfully grow green onions in a greenhouse, water frequently and keep the soil moist. Green onions may grow successfully in a greenhouse, but raising sweet and dry onions inside may be a waste of space and energy.Green onions grow fast in a cool, coastal climate or a climate-controlled greenhouse. It takes 100 or more days to produce a sweet or dry onion, filling a greenhouse for months.. 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.