Look to ensure a distance
11.7 inches (30.0 cm) between Citrina seeds when sowing to make sure your seedlings have enough space.
By our calculations, you should look at sowing Citrina about 42 days before your last frost date.
As Citrina is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
Citrina var. vespertina aka lemon lily aka citron lily aka lilioasphodel