- Name: Purple Laura Bush Petunia - Scientific Name: Petunia Violacea - Color: Violet Purple - Plant Seeds: At 68 - 86f - Bloom Time: April - Frost - Hardiness Zone: 7 - 10 - Plant Height: 18 - 24" - Plant Spacing: 15 - 18" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 200 Seeds - Other: This Petunia Has Tons Of Large Fragrant Frilled 1 - 1 1/2" Trumpet Flowers That Bees & Butterflies Love To Visit. They Are Both More Heat & Cold Tolerant Than Other Petunias. They Are Hardy Down To Zone 7, & Will Reseed Themselves For Next Year In The Lower Zones As Well. The Laura Bush Petunias Are Named After The Former President's Wife.