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Longitudinal section through bulb Cross section of onion bulb. The bulb's leaf bases, also known as scales, generally do not support leaves, but contain food reserves to enable the plant to survive adverse conditions. At the center of the bulb is a vegetative growing point or an unexpanded flowering shoot.
The bulbs need some exposure to cold temperatures for 12 to 14 weeks in order to bloom. [1] Flower bulbs are generally planted in the fall in colder climates. The bulbs go dormant in the winter but they continue to absorb water and nutrients from the soil and they develop roots. [2] Most bulbs produce perennial flowers.
The bulbs are produced to satisfy the demand for bulbs for parks, gardens and as house plants, in addition to providing the bulbs necessary for the production of cut flowers. The international trade in cut flowers has a worldwide value of approximately 11,000 million Euros, which gives an idea of the economic importance of this activity.
A craze for bulbs soon grew in France, where in the early 17th century, entire properties were exchanged as payment for a single tulip bulb. The value of the flower gave it an aura of mystique, and numerous publications describing varieties in lavish garden manuals were published, cashing in on the value of the flower.
Amaryllis (/ ˌ æ m ə ˈ r ɪ l ɪ s /) [1] is the only genus in the subtribe Amaryllidinae (tribe Amaryllideae).It is a small genus of flowering bulbs, with two species.The better known of the two, Amaryllis belladonna, is a native of the Western Cape region of South Africa, particularly the rocky southwest area between the Olifants River Valley and Knysna.
The flowers are strongly and sweetly scented. [8] The seeds are black, and germinate on the soil surface. [13] The bulbs produce contractile roots; when these roots contract, they draw the bulbs down into deeper layers of the soil where there is greater moisture, reaching depths of 10–12 cm (3.9–4.7 in). [13]