Direct sow 1/4” deep after danger of frost, or sow indoors for transplant 6 weeks before last frost. Thin/ transplant to 12”. Plants prefer full sun. Deadhead to prolong bloom and limit self-seeding.
Collect seeds from seed heads that are fully dry. Shell by hand, winnow or screen to clean. some cross-pollination may occur, isolate from varieties of the same species by 1/4 mile.