Column Stock Avalanche Matthiola

Column Stock Avalanche is a single-stem florist type of Matthiola incana with an upright habit and a listed height of 24–30 inches. PanAmerican Seed describes it as a field-grown stock that flowers from late spring through summer and prefers cool growing periods for good stem development. ## Flowering and form The exact product page describes dense spikes of large, scented, double flowers closely spaced along the stems. Avalanche is non-selectable for doubleness, so the grower does not sort out single-flowered plants as with selectable stock lines. ## Garden growing Stock 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 when temperatures rise above 80°F. The PanAmerican field-production page also cautions that high heat can stunt plants or prevent flower spikes from developing. The page’s seasonal listing is a general guide; outdoor timing can vary with local conditions. Sources: [PanAmerican Seed: Column Stock Avalanche](https://www.panamseed.com/Products/074600341000391/matthiola-column-stock-avalanche/); [North Carolina Extension Gardener Plant Toolbox: Matthiola incana](https://plants.ces.ncsu.edu/plants/matthiola-incana/). ## Maintenance Use a sunny, freely draining site and keep moisture even during active growth. Plant for the cooler part of the local season, since heat can reduce stem quality and flowering.