Bulbs are a very specialized group of perennial plants. While a true bulb (allium, narcissus, lilium,etc.)is a short underground stem surrounded by modified fleshy leaves that protect and store food for use by the plant, corms (gladiolus), rhizomes (iris and calla), tubers (begonia), and tuberous roots (dahlia) are often referred to as bulbs.

Most bulbs prefer soil that drains well yet retains a certain amount of water. They are typically planted in the early fall, with exception to gladiolus, montbretia, schizostylis, tigridia which are planted in March or April. Plant bulbs at a depth three times as deep as the bulb's diameter and allow them to grow until they turn yellow and die. Green leaves manufacture foods that are stored in the bulb for the following years growth. Fertilize bulb plants immediately after flowering to assist in the process. Narcissus, scilla, and muscari are excellent for naturalizing, while others like tulips and lilies are better adapted for planting in formal beds.