What climate is required for growing onions?

Onions grow best in cool climates with long days. The ideal temperature for onion growth is between 55 and 65 degrees Fahrenheit. Onions can tolerate temperatures as high as 75 degrees Fahrenheit, but they will not produce as many bulbs. Onions also need at least 12 hours of daylight per day to grow properly.

Onions can be grown in a variety of soils, but they prefer well-drained, sandy loam soils. Onions also need a pH between 6.0 and 6.8.

Onions are susceptible to a variety of pests and diseases, including thrips, aphids, onion maggots, and downy mildew. To prevent these pests and diseases, it is important to keep the onion bed clean and free of debris. It is also important to rotate the onion crop with other vegetables.