Centum™ Deep Blue Matthiola

Centum™ Deep Blue is an upright stock selection with deep-blue flowers and a listed height of 25–32 inches. PanAmerican Seed places it in the Centum series and lists an early-spring through late-spring bloom season and sun exposure. ## Plant profile The exact product page identifies the selection as ‘Balcentdelu’, gives a height of 25–32 inches, and describes an upright habit. The producer classifies the series for spring flowering and lists sun exposure. Its selectable stock lines can produce single- or double-flowered plants, which growers select at the young-plant stage. ## Garden growing Matthiola incana is a cool-season plant. North Carolina State Extension recommends full sun and average to humusy, consistently moist, well-drained soil; the species tends to decline as temperatures rise above 80°F. The species is often grown as an annual or biennial, although the exact Centum page focuses on greenhouse production. For a garden planting, treat its outdoor performance as seasonal and climate-dependent rather than assuming the grower’s production schedule applies outdoors. Sources: [PanAmerican Seed: Centum™ Deep Blue](https://www.panamseed.com/Products/074602896000653/matthiola-centum-deep-blue/); [North Carolina Extension Gardener Plant Toolbox: Matthiola incana](https://plants.ces.ncsu.edu/plants/matthiola-incana/). ## Maintenance Choose a sunny, freely draining site and keep the soil evenly moist without waterlogging. In warm climates, plan this cool-season stock for the milder part of the year and replace it when heat causes decline.