Keep in mind when planting that Lilacina Plena is thought of as hardy, so this plant will survive close to or on freezing temperatures. Lilacina Plena needs a sandy, loamy and clay soil with a ph of 5.6 to 6.0 (weakly acidic soil).
By our calculations, you should look at sowing Lilacina Plena about 105 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Lilacina Plena is a hardy plant.