Mystic Illusion Dahlia

Mystic Illusion is a named dahlia with bright yellow, star-shaped flowers above deeply colored divided foliage. Proven Winners lists mature dimensions of 18–36 inches tall by 12–16 inches wide and rates the selection for USDA zones 8–11. The breeder also recommends it for landscape beds and containers. ## Garden use The mounded plants bring a strong contrast of yellow flowers and dark foliage to sunny mixed borders, seasonal beds, and patio containers. The official profile lists full or part sun, average water needs, and flowering in spring and summer, with blooms continuing from planting until frost in suitable conditions. It also identifies heat tolerance and butterfly interest. See the [Mystic Illusion plant profile](https://www.provenwinners.com/plants/dahlia/mystic-illusion-dahlia) and the [Dahlia growing guide](https://www.provenwinners.com/learn/how-to/dahlia) for breeder details. ## Cultivar identity The named cultivar is ‘Knockout’, also marketed as Mystic Illusion. Its patent describes upright growth, mahogany-black divided leaves, and yellow star-shaped flowers; the selection’s garden profile describes a mounded habit. The [PP18,339 patent record](https://patents.justia.com/patent/PP18339) documents the cultivar denomination and issue date. ## Maintenance Deadhead faded flowers to encourage continued bloom. In climates colder than its listed USDA 8–11 range, grow it as a seasonal annual or lift and store the tubers after frost; follow the breeder’s guide for handling and storage. Provide well-drained conditions and avoid leaving stored tubers where they can freeze.