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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.
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 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.
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]
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.
Galanthus nivalis: Flora von Deutschland, Österreich und der Schweiz, 1885. Galanthus (from Ancient Greek γάλα, (gála, "milk") + ἄνθος (ánthos, "flower")), or snowdrop, is a small genus of approximately 20 species of bulbous perennial herbaceous plants in the family Amaryllidaceae.
O. umbellatum is a perennial herbaceous bulbous plant , dying back after flowering, to an underground storage bulb. The following year, it regrows from the often shallow rooted bulbs, which are ovoid with a membranous coat, [2] 15–25 millimetres (1 ⁄ 2 –1 inch) long and 18–32 mm (3 ⁄ 4 – 1 + 1 ⁄ 4 in) in diameter.
Crocuses are among the most important ornamental geophytes in the global flower industry, [108] ranking sixth in terms of Dutch bulb production (2003–2008) with 463–668 ha under cultivation. [109] The crocus is one of the most popular flowers found in the garden in the late winter and early spring. [20]