A bulb is a short stem with fleshy leaves or leaf bases. The leaves often function as food storage organs during dormancy .
Bulbs thrive in dry and desert regions of Africa and Americas.
Their shapes vary from round to tailed, thick shrubby, bulb etc. They can grow either above or under the ground. Potted plants grow only above ground. They store enough water inside their bulb trunks during short rainy season to sustain them during long dry months.
Bulbs are rare plants and the collecting from the natural habitat is prohibited. Still there are cases of smuggling of bulbs mixed among ordinary plants. Thus bulbs can reach extremely high price.
Literature recommends planting the seeds as the way to bring up your own bulb. That is extremely long process as bulbs grow 10-15 cm in 20 years. It is easier to purchase an adult plant in a specialized shop.