Keep in mind when planting that Kronenbourg is thought of as hardy, so this plant will survive close to or on freezing temperatures. Planting Kronenbourg in loamy soil with a ph of between 5.5 and 7.0 is ideal for as it does best in weakly acidic soil to neutral soil.
As a hybrid variety, this plant will not reliably grow true to type from seed.
As Kronenbourg is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.