cosmos seeds in a mixture of 11 varieties - long blooming period in all zones marde ross & company because of their mexican heritage, these bright annuals meet high heat and drought conditions with native beauty and vigor. spanish conquistadors searching for gold discovered these flowers on their journeys through mexico. mission gardens often included these flowers, which priests gave the name "cosmos," the greek word for a harmonious whole, because of their neatly spaced petals. cosmos flowers made their way to england with spanish ambassadors in the late 18th century, and to the united states in the following century.