Tong Ho (Glebionis coronaria), Feverfew (Tanacetum parthenium) Tansy (Tanacetum vulgare). Start chrysanthemum indoors 4-6 weeks before last frost, or direct seed outdoors after last frost. Ideal germination temperature is 70F. Sow seeds 1/4-1/8 inch deep. Seeds germinate in 10-20 days. Prefers full sun to light shade, well-drained soil and moderate moisture. Space plants 8-12 inches apart. For blooming varieties, succession plant every few weeks for continuous blooming.