- Name: Shell Pink Mask Flower - Scientific Name: Alonsoa Meridionalis Syn. Alonsoa Grandiflora - Color: Shell Pink (Salmony Pink) - Plant Seeds: When Soil Temp Warms To 70f - Bloom Time: Summer – Fall - Hardiness Zone: 9 - 11 / Popular Annual - Plant Height: 18 - 24" - Plant Spacing: 12 - 15" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 50 Seeds - Other: The Mask Flower Is Native To Peru. It Is A Tender Perennial That Is Fast Growing & Can Easily Be Grown As An Annual In Cooler Climates. The Huge 2” Brightly Colored Flowers Are Excellent For Cutting, But Be Sure To Leave A Few For The Bees, Butterflies, & Hummingbirds.