Swamp Marigold from North America are mostly winter hardy, tall growing perennials with numerous large, bright sulfur yellow flowers in mid summer. They are native of humus rich, semi-moist soils in prairies, open spots in woods and along side rivers. Cosmos species are native of Mexico to South America. These are non winterhardy and prefer rather dryish soils and are grown as annuals. All are easily grown in any rich, well-drained soil in a sunny to partially shaded spot, Mexican species in full sun.
Sow seeds from winter hardy species flat in any rich, well drained soil. Keep pots in a sunny, protected spot outside. Most species require a cooling period of several months prior to germination. If these species are sowed late in the year, they do not germinate before spring in the following year. Transplant to the final spot in the garden from mid summer to early autumn. Annual Mexican members should be sowed directly to the ground after the last freezing nights by the end of spring.
All are USDA Climate Zone 6.
20 seeds per package..