Keep in mind when planting that Wave Rose is thought of as very hardy, so this plant will tend to survive through freezing conditions. Planting Wave Rose in loamy soil with a ph of between 6.0 and 7.0 is ideal for as it does best in weakly acidic soil to neutral soil.
By our calculations, you should look at sowing Wave Rose about 56 days before your last frost date.
As Wave Rose is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.