Keep in mind when planting that Viette's Little Suzy is thought of as very hardy, so this plant will tend to survive through freezing conditions. A soil ph of between 5.6 and 7.5 is ideal for Viette's Little Suzy as it does best in weakly acidic soil - weakly alkaline soil.
Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Viette's Little Suzy about 49 days before your last frost date.
As Viette's Little Suzy is very hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.