Direct sow 1/16-1/8” deep after danger of frost, or sow indoors for transplant 6 weeks before last frost. Thin/ transplant to 12-18”. Plants prefer full sun. Deadheading prolongs bloom and limits self-seeding.
Collect seeds from seed heads that are fully dry. Shell by hand or shake plants with dry seed heads into a bucket, winnow or screen to clean. Some cross-pollination may occur, isolate from varieties of the same species by 1/4 mile.