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Plant Hardiness
Hardiness of plants describes their ability to survive adverse growing conditions. It is usually limited to discussions of climatic adversity. Thus a plant's ability to tolerate cold, heat, drought, flooding, or wind are typically considered measurements of hardiness. Hardiness of plants is defined by their native extent's geographic location: longitude, latitude and elevation. These attributes are often simplified to a hardiness zone. In temperate latitudes, the term most often describes resistance to cold, or "cold-hardiness", and is generally measured by the lowest temperature a plant can withstand. Hardiness of a plant may be divided into two categories: tender, and hardy. Tender plants are those killed by freezing temperatures, while hardy plants survive freezing—at least down to certain temperatures, depending on the plant. "Half-hardy" is a term used sometimes in horticulture to describe bedding plants which are sown in heat in winter or early spring, and planted outsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Plant
Plants are the eukaryotes that form the Kingdom (biology), kingdom Plantae; they are predominantly Photosynthesis, photosynthetic. This means that they obtain their energy from sunlight, using chloroplasts derived from endosymbiosis with cyanobacteria to produce sugars from carbon dioxide and water, using the green pigment chlorophyll. Exceptions are parasitic plants that have lost the genes for chlorophyll and photosynthesis, and obtain their energy from other plants or fungi. Most plants are multicellular organism, multicellular, except for some green algae. Historically, as in Aristotle's biology, the plant kingdom encompassed all living things that were not animals, and included algae and fungi. Definitions have narrowed since then; current definitions exclude fungi and some of the algae. By the definition used in this article, plants form the clade Viridiplantae (green plants), which consists of the green algae and the embryophytes or land plants (hornworts, liverworts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cold Hardening
Cold hardening is the physiological and biochemical process by which an organism prepares for cold weather. Plants Plants in temperate and polar regions adapt to winter and sub zero temperatures by relocating nutrients from leaves and shoots to storage organs. Freezing temperatures induce dehydrative stress on plants, as water absorption in the root and water transport in the plant decreases. Water in and between cells in the plant freezes and expands, causing tissue damage. Cold hardening is a process in which a plant undergoes physiological changes to avoid, or mitigate cellular injuries caused by sub-zero temperatures. Non-acclimatized individuals can survive −5 °C, while an acclimatized individual in the same species can survive −30 °C. Plants that originated in the tropics, like tomato or maize, don't go through cold hardening and are unable to survive freezing temperatures. The plant starts the adaptation by exposure to cold yet still not freezing temperat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 contiguous states border Canada to the north and Mexico to the south, with the semi-exclave of Alaska in the northwest and the archipelago of Hawaii in the Pacific Ocean. The United States asserts sovereignty over five Territories of the United States, major island territories and United States Minor Outlying Islands, various uninhabited islands in Oceania and the Caribbean. It is a megadiverse country, with the world's List of countries and dependencies by area, third-largest land area and List of countries and dependencies by population, third-largest population, exceeding 340 million. Its three Metropolitan statistical areas by population, largest metropolitan areas are New York metropolitan area, New York, Greater Los Angeles, Los Angel ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Heather In Yorkshire 02
Heather may refer to: Plants *The heather family, or Ericaceae, particularly: **Common heather or ling, ''Calluna'' **Various species of the genus ''Cassiope'' **Various species of the genus ''Erica'' Name * Heather (given name) * Heather (surname) Arts and media * '' Heathers'', a 1989 film directed by Michael Lehmann ** '' Heathers: The Musical'', a musical by Laurence O'Keefe based on the film ** ''Heathers'' (TV series), a 2018 television series based on the film * "Heather" (''The Secret Circle''), a television episode Music * Heathers (band), an acoustic singing duo from Ireland * "Heather" (Beatles song), an unreleased 1968 song by Paul McCartney and Donovan * "Heather" (Conan Gray song), a 2020 song by American singer Conan Gray * "Heather", a song from fusion drummer Billy Cobham's 1974 album ''Crosswinds'' * "Heather", a 2001 song by Paul McCartney from the album '' Driving Rain'' * "Heather", a song from ''Patent Pending'' by Heavens * "Heather", a version o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Colobanthus Quitensis
''Colobanthus quitensis'', also known as the Antarctic pearlwort, is one of two native flowering plants found in the Antarctic region, the other being Antarctic hair grass. It has yellow flowers and grows about tall, giving it a moss-like appearance. Due to climate change, the species has been spreading rapidly, particularly to areas outside Antarctica. Description ''Colobanthus quitensis'' has yellow flowers and grows about tall, with a cushion-like growth habit that gives it a moss-like appearance. It is an angiosperm, meaning that it is a plant that produces flowers, and is capable of asexual reproduction. It relies on wind pollination because of the lack of bees and other pollinating insects in the Antarctic region. Although it is moss-like, ''Colobanthus quitensis'' is a tracheophyte, or vascular plant, meaning that it contains vascular tissues called the phloem and xylem. Symbiosis Endophytic fungi have been found living inside of the leaves of Colobanthus quite ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Supercooling
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid below its freezing point without it becoming a solid. Per the established international definition, supercooling means ''‘cooling a substance below the normal freezing point without solidification’.'' IIR International Dictionary of Refrigeration, http://dictionary.iifiir.org/search.php ASHRAE Terminology, https://www.ashrae.org/technical-resources/free-resources/ashrae-terminology While it can be achieved by different physical means, the postponed solidification is most often due to the absence of nucleation, seed crystals or nuclei around which a crystal structure can form. The supercooling of water can be achieved without any special techniques other than chemical demineralization, down to . Supercooled water can occur naturally, for example in the atmosphere, animals or plants. This phenomenon was first identified in 1724 by Daniel Gabriel Fahrenheit, while developing Fahren ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winter Garden
A winter garden is a kind of garden maintained in wintertime. History The origin of the winter garden dates back to the 17th to 19th centuries where European nobility constructed large conservatories that housed tropical and subtropical plants and acted as an extension of their living space. Many of these were attached to their main palaces. Earlier versions were constructed of masonry with large windows and a glass roof, usually in the Classical or Gothic styles. While in the 19th century many of these conservatories were made out of iron and curvilinear glass. Winter gardens were not just restricted to private residence; many were built for the greater public. The first large public winter garden was built in 1842–46 in Regent's Park, and was used for evening occasions, large flower shows and social gatherings.Kohlmaier, Georg. Houses of Glass: A Nineteenth-Century Building Type. MIT Press. Cambridge, Massachusetts. 1991. Other winter gardens, such as the Crystal Palac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Freesia
''Freesia'' is a genus of herbaceous perennial flowering plants in the family Iridaceae, first described as a genus in 1866 by Christian Friedrich Ecklon (1886) and named after the German botanist and medical practitioner, Friedrich Freese (1795–1876). It is native to the eastern side of southern Africa, from Kenya south to South Africa, most species being found in Cape Provinces. Species of the former genus ''Anomatheca'' are now included in ''Freesia''. The plants commonly known as "freesias", with fragrant funnel-shaped flowers, are cultivated hybrids of a number of ''Freesia'' species. Some other species are also grown as ornamental plants. Description They are herbaceous plants which grow from a conical corm diameter, which sends up a tuft of narrow leaves long, and a sparsely branched stem tall bearing a few leaves and a loose one-sided spike of flowers with six petals. Many species have fragrant narrowly funnel-shaped flowers, although those formerly placed in the g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tulip
Tulips are spring-blooming perennial herbaceous bulbiferous geophytes in the ''Tulipa'' genus. Their flowers are usually large, showy, and brightly coloured, generally red, orange, pink, yellow, or white. They often have a different coloured blotch at the base of the tepals, internally. Because of a degree of variability within the populations and a long history of cultivation, classification has been complex and controversial. The tulip is a member of the lily family, Liliaceae, along with 14 other genera, where it is most closely related to '' Amana'', ''Erythronium'', and '' Gagea'' in the tribe Lilieae. There are about 75 species, and these are divided among four subgenera. The name "tulip" is thought to be derived from a Persian word for turban, which it may have been thought to resemble by those who discovered it. Tulips were originally found in a band stretching from Southern Europe to Central Asia, but since the seventeenth century have become widely naturalise ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carrot
The carrot ('' Daucus carota'' subsp. ''sativus'') is a root vegetable, typically orange in colour, though heirloom variants including purple, black, red, white, and yellow cultivars exist, all of which are domesticated forms of the wild carrot, ''Daucus carota'', native to Europe and Southwestern Asia. The plant probably originated in Iran and was originally cultivated for its leaves and seeds. The carrot is a biennial plant in the umbellifer family, Apiaceae. World production of carrots (combined with turnips) for 2022 was 42 million tonnes, led by China producing 44% of the total. The characteristic orange colour is from beta-carotene, making carrots a rich source of vitamin A. A myth that carrots help people to see in the dark was spread as propaganda in the Second World War, to account for the ability of British pilots to fight in the dark; the real explanation was the introduction of radar. Etymology The word is first recorded in English around 1530 and w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Broccoli
Broccoli (''Brassica oleracea'' var. ''italica'') is an edible green plant in the Brassicaceae, cabbage family (family Brassicaceae, genus ''Brassica'') whose large Pseudanthium, flowering head, plant stem, stalk and small associated leafy greens, leaves are eaten as a vegetable. Broccoli is classified in the Brassica_oleracea#Cultivar_groups, Italica cultivar group of the species ''Brassica oleracea''. Broccoli has large flower heads, or florets, usually dark green, arranged in a tree-like structure branching out from a thick plant stem, stalk, which is usually light green. Leaves surround the mass of flower heads. Broccoli resembles cauliflower, a different but closely related cultivar group of the same ''Brassica'' species. It can be eaten either raw or cooked. Broccoli is a particularly rich source of vitamin C and vitamin K. Contents of its characteristic sulfur-containing glucosinolate compounds, isothiocyanates and sulforaphane, are diminished by boiling but are better p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cabbage
Cabbage, comprising several cultivars of '' Brassica oleracea'', is a leafy green, red (purple), or white (pale green) biennial plant grown as an annual vegetable crop for its dense-leaved heads. It is descended from the wild cabbage ( ''B. oleracea'' var. ''oleracea''), and belongs to the " cole crops" or brassicas, meaning it is closely related to broccoli and cauliflower (var. ''botrytis''); Brussels sprouts (var. ''gemmifera''); and Savoy cabbage (var. ''sabauda''). A cabbage generally weighs between . Smooth-leafed, firm-headed green cabbages are the most common, with smooth-leafed purple cabbages and crinkle-leafed savoy cabbages of both colours being rarer. Under conditions of long sunny days, such as those found at high northern latitudes in summer, cabbages can grow quite large. , the heaviest cabbage was . Cabbage heads are generally picked during the first year of the plant's life cycle, but plants intended for seed are allowed to grow a second year and m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
