- You Will Get 5 Seeds Of Cup & Saucer Vine Cathedral Bells Cobaea Scandens Purple Hummer Flower Seeds. - Description: - Name: Cup & Saucer Vine. - Other Common Names: Cathedral Bells / Monastery Bells. - Scientific Name: Cobaea Scandens. - Color: Purple. - Plant Seeds: At 70 - 75f. - Bloom Time: Mid Summer - Fall, Even When Started By Seed In Spring. - Hardiness Zone: 9 - 11 Or As An Annual In Cooler Climates. - Plant Height: 10 - 20' As An Annual, 30 - 40' Where They Are Perennial. - Plant Spacing: 12 - 15". - Light Requirements: Sun. - Soil & Water Preferences: Average.