Peter™ III Blue Aster

Peter™ III Blue is a vigorous New York aster selected for blue, double flowers in the fall. [Syngenta Flowers](https://www.syngentaflowers.com/ams/product/flower/70018158) lists it at 18–20 inches tall and 20–24 inches wide, making it a useful middle-height accent for sunny borders and fall containers. ## Seasonal display and placement Syngenta identifies the cultivar as Aster novi-belgii Peter™ III Blue, code 70018158, and describes it as a late-season, tall-vigor selection with double flowers. The breeder lists full sun, fall flowering, blue flowers, 18–20 inches of garden height and 20–24 inches of spread. The catalog dimensions are cultivar-specific; exact performance will vary with production and garden conditions. ## Growing conditions New York aster is a herbaceous perennial in the Asteraceae family. [North Carolina Extension](https://plants.ces.ncsu.edu/plants/symphyotrichum-novi-belgii/) notes that the species grows in sunny or partly shaded sites with well-drained soil and can use sandy, loamy or clay soils. Its broad species profile supports using the cultivar in a pollinator border, while the breeder’s full-sun recommendation is the more specific siting guidance for Peter III Blue. ## Maintenance Water during establishment and during extended dry spells, while keeping the root zone draining freely. Watch for powdery mildew in crowded or poorly ventilated plantings; divide established clumps when they become congested. Leave enough room for the spread listed by the breeder.