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In colder regions (the US and UK), it acts like a bulb, dormant through to the spring before emerging and producing leaves and flowers (in a shorter period) before disappearing in summer. [ 11 ] When the iris, has finished flowering, most of the plant withers away, apart from a growth point, which is similar in form to a bulb.
The leaves are longer than the flowering stems. [5] It has a very short flowering stem or scape, 10–30 cm (4–12 in) long. [12] [13] [14] Although, sometimes the stems do not emerge above ground. [3] It has 2 to 4, pointed (acuminate), membranous, green, between 5–10 cm (2–4 in) long and 8–10 mm wide, spathes (leaves of the flower bud).
Planted in autumn to give a display until early spring, the plants used for winter bedding are mainly hardy perennials. 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.
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.
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.
The leaves are variable in size, they can grow up to between 6–20 cm (2–8 in) long, [7] and between 0.2 and 1 cm wide, at blooming time. Before the plant produces fruit or seed capsules, they extend up to between 34–45 cm (13–18 in) long, [2] [3] taller than the flowers. [4] They are light green, [3] greyish green or yellowish green.
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 ...
Leucojum aestivum is a perennial bulbous plant, generally 35–60 cm (14–24 in) tall, but some forms reach 90 cm (35 in). Its leaves, which are well developed at the time of flowering, are strap-shaped, 5–20 mm (0.2–0.8 in) wide, reaching to about the same height as the flowers.
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