|How are Alliums measured?|
Alliums are measured by the circumference of the bulb. The greater the circumference of the bulb, the more food is stored by the plant to give it a better start and greater success.
A larger bulb will produce a fuller plant with more flowers, giving you a more beautiful garden. A 18/20cm Allium will produce 2-3 stems per bulb versus a smaller bulb size.