Bulbs (which are referred to as “true bulbs”) grow in layers, much like an onion. At the very center of the bulb is a miniature version of the flower itself. It is composed of a shortened stem covered with modified leaves called scales. Helping the bulb to stay together is something called a basal plate, which is a round, flat area that are the beginnings of the roots on the bottom of the bulb.
Many plants such as daffodils form new bulbs around the original bulb. These bulbs, called offsets, develop from buds within the base of the mother bulb and produce new plants. When these bulbs become overcrowded, the flowers start to diminish in size. This is an indication that it is time to dig up and divide the bulbs.
Examples of True Bulbs: Tulips, Daffodils and Alliums commonly known as Onions
TRUE BULBS ANATOMY
The true bulb has five major parts.
BASEL PLATE: bottom of the bulb which hold the bulb together and from which the roots grow
primary storage tissue
skin-like covering that protects the fleshy scales
consisting of developing flower and leaf buds
develop into bulblets or offsets