Keep in mind when planting that Rosea is thought of as hardy, so this plant will survive close to or on freezing temperatures. Rosea tends to grow best in a soil ph of between 5.1 and 7.5 meaning it does best in weakly acidic soil - weakly alkaline soil.
Growing Rosea from seed
Transplanting Rosea
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Rosea is a hardy plant.