Try to plant in a location that enjoys full sun and remember to water moderately. Keep in mind when planting that Ultra white is thought of as half hardy, so protect with a row cover whenever the temperatures drop. Ultra white requires a potting mix and loamy soil with a ph of 5.5 - 7.0 - it grows best in weakly acidic soil to neutral soil.
Growing Ultra white from seed
By our calculations, you should look at sowing Ultra white about 77 days before your last frost date.
Transplanting Ultra white
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Ultra white is a half hardy plant.