Feathery foliage on tall and vigorous dill plants that mature and form seed quickly from large umbels of yellow flowers. Sow Long Island Mammoth dill seeds at the back of the herb or vegetable bed, as plants can reach 2m (6′) tall or more. In fact, it gets so tall, it makes a nice specimen plant, central in the garden. Harvest the leaves as needed. The leaves and seeds dry well.
The structure of dill’s flowers is known as an umbel. Thus dill is considered an umbelliferous plant. Other umbellifers include carrots, cilantro, fennel, parsnips, and Ammi. All of these plants are attractive to predatory insects such as lady beetles, Syrphid flies (hover-flies), lacewings, and tiny parasitoid wasps. WCS recommends that organic gardeners should grow some dill precisely to attract these beneficial insects, for they will control pest insects like aphids, thrips, whitefly, and the caterpillar of the Small White Butterfly (cabbage moth).