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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.
Narcissus is a genus of perennial herbaceous bulbiferous geophytes, which die back after flowering to an underground storage bulb.They regrow in the following year from brown-skinned ovoid bulbs with pronounced necks, and reach heights of 5–80 centimetres (2.0–31.5 in) depending on the species.
Furthermore, although flower development is induced at warmer temperatures (20–25 °C or 68–77 °F), elongation of the flower stalk and proper flowering is dependent on an extended period of low temperature (< 10 °C or 50 °F). [27] Tulip bulbs imported to warm-winter areas are often planted in autumn to be treated as annuals.
Orchidaceae is one of the two largest families of flowering plants, along with the Asteraceae. It contains about 28,000 currently accepted species distributed across 763 genera. [3][4] The Orchidaceae family encompasses about 6–11% of all species of seed plants. [5] The largest genera are Bulbophyllum (2,000 species), Epidendrum (1,500 ...
Iris (plant) Iris. (plant) Iris is a flowering plant genus of 310 accepted species [1] with showy flowers. As well as being the scientific name, iris is also widely used as a common name for all Iris species, as well as some belonging to other closely related genera. A common name for some species is flags, while the plants of the subgenus ...
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]
A floral diagram is a schematic cross-section through a young flower. [1] It may be also defined as “projection of the flower perpendicular to its axis”. [3] It usually shows the number of floral parts, [Note 2] their sizes, relative positions and fusion. Different organs are represented by distinguishable symbols, which may be uniform for ...
This was carried out by a Dutch bulb firm 'Van Tubergen' (based in Haarlem) in the 19th century. [3] Because the bulb could be forced in a greenhouse to flower early, it was popular with florists. Since the 1900s it has been crossed with other species to create various cultivars. After the Second World War, stocks of bulbs were imported to America.
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