Fennel Sweet 茴香 Botanical Name: Foeniculum vulgare dulce Plant Part: seeds Extraction Method: steam Country of Origin: China Plant: The fennel plant reaches about 5 feet in height with busy green leaves, it has yellow flowers and grows oblong shaped fruits. It is the flowers that produce the seeds used in distillation Oil: The seeds are crushed before they are distilled and create a colourless essential oil.