Greenhouse- grown Matthiola are distinguished from field-grown types by the softer green leaves. NOTE: Selectable Matthiola will produce approximately 50% double- flowering types, but it is easy to select out the single- flowered types at the young plant stage. Bred for specific seasonal performance, the Aida, Carmen and Figaro series team up with the Opera (Vegmo) series to offer an outstanding lineup of greenhouse- grown selectable Matthiola varieties for year- round production. Transplanting for seasons earlier than listed will result in later flowering. All three series offer excellent seed quality. Under northern European conditions, transplant Carmen varieties in March and April for flowering in June and July.