- You Will Get 50 Seeds Of Blue Gem Nemesia Strumosa Flower Seeds. - Description: - Name: Blue Gem Nemesia. - Scientific Name: Nemesia Strumosa. - Color: Blue. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 6 - 12". - Plant Spacing: 9 - 12". - Bloom Time: All Summer. - Hardiness Zone: 9 – 10. - Light Requirements: Sun - Part Shade. - Soil & Water Preferences: Average.