There are several types easily grown from seed. All are in the plant genus Tagetes. French marigolds, Tagetes patula, are smaller plants with fern-like foliage. Varieties such as 'Cottage Red ...

Grow French marigolds among tomatoes. Marigolds emit a strong odour that will repel greenfly and blackfly. Grow sage with carrots or plants in the cabbage family to ward off pests. Both have ...