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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.
Flowering plant bulbs are planted beneath the surface of the earth. 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 ...
Sternbergia lutea, the winter daffodil, [3] [4] autumn daffodil, fall daffodil, lily-of-the-field, or yellow autumn crocus, [a] is a bulbous flowering plant in the family Amaryllidaceae, subfamily Amaryllidoideae, [5] in the Narcisseae tribe, which is used as an ornamental plant. It has yellow flowers which appear in autumn.
They bear five to six narrow and flattened dark green linear leaves, about 3 to 4 mm (0.12 to 0.16 in) wide, from spherical tunicate bulbs around 1.5 to 2.5 centimetres (0.59 to 0.98 in) in diameter. [4] [5] [6] The single funnel-shaped flowers are borne erect or slightly inclined on scapes around 10 to 15 cm
Spring flowering bulbs (tulip, narcissus, hyacinth, etc.) are also planted in the fall. Winter-hardy ornamental vegetables such as cultivars of kale and cabbage with coloured or variegated foliage are increasingly common. Primula cultivars (polyanthus and primroses) are commonly used, as are winter-flowering heathers and winter pansies.
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.
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The reproductive phase change of A. thaliana occurs by a sequence of two related events: first, the bolting transition (flower stalk elongates), then the floral transition (first flower appears). [13] Bolting is a robust predictor of flower formation, and hence a good indicator for vernalization research. [13]