Opus™ III/IV Red Antirrhinum

Opus™ III/IV Red is an upright red snapdragon selected for cut flower production. Syngenta’s regional pages give different garden-height estimates, 24–30 inches in the Americas and 100–110 cm in APAC, and list garden width as 14–16 inches and 35–40 cm, respectively. ## Cultivar and use The [Syngenta Americas profile](https://www.syngentaflowers.com/ams/product/flower/70018069) identifies this exact selection and lists its garden height as 24–30 inches and width as 14–16 inches. The [Syngenta APAC profile](https://www.syngentaflowers.com/apac/product/flower/70018069) gives a garden height of 100–110 cm and width of 35–40 cm. These are differing regional garden estimates, shown separately rather than combined. Both profiles describe Opus as a cut-flower series with sturdy stems, but neither assigns a numeric stem height. ## Growing conditions Syngenta lists full sun and upright habit for the exact selection and flowering in late spring and fall. For snapdragons generally, [Illinois Extension](https://extension.illinois.edu/flowers/snapdragon) recommends full sun to light shade and moist, well-drained soil, describes cooler-season performance, and notes that tall cultivars may need staking. This is species-level guidance rather than a cultivar-specific soil or hardiness recommendation. ## Maintenance Remove spent flower spikes to encourage rebloom, as Illinois Extension recommends for snapdragons. Stake plants when stems need support and keep the root zone well drained. Treat the Opus Group III/IV designation as production timing rather than a fixed garden bloom calendar.