- You Will Get 10 Seeds Of Tecoma Stans Yellow Bells Trumpetbush Elder Esperanza Flower Shrub Seeds. - Description: - Name: Tecoma Stans. - Other Common Names: Yellow Trumpetbush / Yellow Bells / Yellow Elder / Esperanza. - Scientific Name: Tecoma Stans. - Color: Yellow. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 10 - 12' Foot Shrub. - Plant Spacing: 12 - 15 Feet. - Bloom Time: Summer – Frost. - Hardiness Zone: 7 – 11. - Light Requirements: Sun - Tolerates Heat Well. - Soil & Water Preferences: Average – Dry.