- You Will Get 300 Seeds Of Feverfew Tanacetum Parthenium Herb Flower Seeds. - Description: - Name: Feverfew. - Scientific Name: Tanacetum Parthenium Syn Chrysanthemum Parthenium. - Color: White With Yellow Centers. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Plant Height: 18 - 24". - Plant Spacing: 18 - 24". - Bloom Time: July – Oct. - Hardiness Zone: 5 - 9 (& Reseeds Itself Easily). - Light Requirements: Sun - Part Shade. - Soil & Water Preferences: Average.