Marigolds belong to the aster family (Asteraceae), genus Tagetes. Their natural range extends from the southwestern United States into Argentina, with their greatest distribution being in south central Mexico. Approximately 50 species are known, but in general, the three most common are African marigolds (T. erecta), French marigolds (T. patula) and Signet marigolds (T. tenuifolia). However, regardless of their name, all marigolds are native to subtropical America and have been cultivated in Mexico for over 2,000 years.
Artemisia – This plant produces a strong antiseptic, although not unpleasant aroma that repels most insects. Planted in drifts it can also deter small animals. My favorite variety is ‘Powis Castle’. I prefer to use this plant in flower borders and not in my vegetable garden because it produces a botanical poison.