Keep in mind when planting that Snow and Sapphires is thought of as hardy, so it can be safe to leave outdoors for the majority of winter (although if in doubt, using a row cover is often a good idea). A soil ph of between 5.5 and 7.5 is ideal for Snow and Sapphires as it does best in weakly acidic soil - weakly alkaline soil.
Ensure a seed sowing distance of
7.02 inches (18.0 cm). Soil temperature should be kept higher than
19°C / 66°F to ensure good germination.
By our calculations, you should look at sowing Snow and Sapphires about 56 days before your last frost date.
As Snow and Sapphires is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.