Best Buy onions
Onions give a good return on garden space, and you can store them right through to spring, so you always have them at hand.
Onion sets (small bulbs) are the easiest way to grow onions and to help you choose which of the many varieties to grow, the team has trialled 12 different varieties, looking at yield, bulb quality and whether they bolted before harvest.
How Which? trials onions
To trial onions, we planted 12 varieties of onion sets in March in 3m-long rows and assessed 30 bulbs of each. We noted which varieties bolted (produced a flower stalk and became unusable) and recorded the size range, weight and quality of the bulbs.