Onions are cool weather crops that grow well in the low temperatures of spring and early summer, bulbing up when the temperatures increase in mid to late summer. Their natural pest repellence makes them great companion plants and their indispensable flavour and versatility in cooking make them a staple in the kitchen. Onions are a significant source of potassium, protein and fiber. Growing Tips: Start seed indoors 8 to 10 weeks prior to setting out. When planting, do not set transplants too deeply in the garden, but instead just cover the base of the plant with enough soil to hold it in place.