- You Will Get 20 Seeds Of Blue Cupids Dart Aka ' Love Plant ' Catananche Caerulea Flower Seeds. - Description: - Name: Cupid's Dart. - Other Common Names: Love Plant. - Scientific Name: Catananche Caerulea. - Color: Blue. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 18". - Plant Spacing: 12 - 18". - Bloom Time: Mid Summer - Early Fall. - Hardiness Zone: 4 – 9. - Light Requirements: Sun. - Soil & Water Preferences: Average.