Local seed wholesale market. Bulb fennel, also known as Italian fennel, fennel and sweet fennel, is a variety of fennel in Umbelliferae. Vegetable seeds are sold in local seed wholesale markets and pesticide stores. The swollen leaf sheath of corm fennel is fresh, tender, crisp and sweet, slightly lighter than fennel. Generally, it is cut into filaments and put into condiments to be eaten raw and cold, and can also be served with various meat fried foods.