Tosca White Matthiola

Tosca White is a white-flowered Matthiola incana selection with a listed height of 24–32 inches. PanAmerican Seed lists late-spring, summer, and autumn flowering and both partial-sun and sun exposure. ## Flowering and form The exact developer page identifies Tosca as selectable greenhouse stock and describes it as suitable for summer production under higher light and temperature. Its schedule includes autumn, spring, summer, and winter crop times, while the listed bloom season runs from late spring through autumn. These are production and seasonal guides, not a guarantee of year-round outdoor bloom. ## 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. Use the developer’s greenhouse summer guidance as production context, while planning outdoor performance around local conditions. Sources: [PanAmerican Seed: Tosca White](https://www.panamseed.com/Products/074606341005863/matthiola-tosca-white/); [North Carolina Extension Gardener Plant Toolbox: Matthiola incana](https://plants.ces.ncsu.edu/plants/matthiola-incana/). ## Maintenance Choose a sunny or lightly shaded, freely draining site and keep soil evenly moist during active growth. In warm climates, plan the strongest display for cooler parts of the year and expect flowering to decline in heat.