white Bulb Variety Producing Bulbs With Flesh Of A Delicate Unique Flavour. We Recommend You Plant This Variety In Spring If Your Soil Is Heavy & Tends To Collect Water In Winter.plant Sets In March & April For Harvests From August. Use Straight Away After Harvesting To Benefit From The Unique Flavour Of Snowball.set Planting Onions Around 15-20cm (6-8in) Apart. Add Onion Fertiliser To Your Soil At Planting Stage To Improve The Uptake Of Nutrients In The Soil For Bigger Bulbs.