Keep in mind when planting that Limoncello is thought of as half hardy, so remember to watch your frost dates and ensure you have this plant protected when the temperature dips.
Soil temperature should be kept higher than
21°C / 70°F to ensure good germination.
By our calculations, you should look at sowing Limoncello about 77 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Limoncello is a half hardy plant.