Thanks to its wonderful colors, Sweet William is perfect to decorate flower beds and garden borders. It blooms from May to September, but requires sufficient sun to bloom, at least 3 to 4 hours of direct sunlight a day. Once settled in, Sweet William needs very little care: to stimulate appearance of new flowers, cut wilted flowers regularly and make sure it gets sufficient water in case of dry spells or heat waves. Wet, poorly drained soil is a concern for sweet William flowers and makes the plant more susceptible to rust and crown rot. 
Sweet William leaves are toxic to humans and pets including cats and dogs. If ingested, it may cause vomiting. Wear gloves while working with the plant, as the leaves may cause contact dermatitis.