Fennel

Fennel (Foeniculum vulgare) is a hardy, aromatic perennial herb, often grown as an annual, known for its feathery, dark green or bronze foliage, tall, hollow, ridged stems (up to 10 feet), and intense, sweet licorice or anise scent. It produces flat-topped clusters of small, yellow flowers in summer, followed by aromatic seeds. 
Key Characteristics and Description:
Foliage: The leaves are finely divided into thin, thread-like segments, giving the plant a delicate, airy, and fern-like appearance.
Flowers: Small yellow flowers are arranged in large, flat-topped umbrella-like clusters known as umbels, which bloom from May to September.
Stems: Upright, branched, and hairless, these stems can reach up to 10 feet (3-7 feet is more common).
Aroma/Flavor: The entire plant, especially the foliage and seeds, possesses a strong, characteristic licorice or anise aroma.
Root System: Features a long, thick taproot.