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H1a, higher than 15 °C (59 °F), applies to tropical plants permanently under glass in heat; while H7, below −20 °C (−4 °F), applies to very cold-tolerant plants such as heathers. Most outdoor plants in the UK fall within the range H4, −10 to −5 °C (14 to 23 °F) (hardy in the average winter) to H5, −15 to −10 °C (5 to 14 °F ...
The ability to control intercellular ice formation during freezing is critical to the survival of freeze-tolerant plants. [3] If intracellular ice forms, it could be lethal to the plant when adhesion between cellular membranes and walls occur. The process of freezing tolerance through cold acclimation is a two-stage mechanism: [4]
This is a list of species in the plant genus Viola, often known as violets or pansies. Viola is the largest genus in the family Violaceae, containing over 680 species. [1] Although similarly named, neither African violets nor dogtooth violets are closely related to the true violas.
Viola is one of about 25 genera and about 600 species in the large eudicot family Violaceae, divided into subfamilies and tribes. While most genera are monotypic, Viola is a very large genus, variously circumscribed as having between 500 and 600 species. Historically it was placed in subfamily Violoideae, tribe Violeae.
Viola labradorica, commonly known as alpine violet, [2] American dog violet, [3] dog violet [4] or Labrador violet, [3] [5] [6] is a perennial herbaceous flowering plant. It is native to Greenland , eastern Canada , and the eastern United States . [ 7 ]
Viola palmata, the trilobed violet, early blue violet, or wood violet (names it shares with other members of its genus), is a species of flowering plant in the family Violaceae. [1] Viola palmata is native to southeastern Canada as well as the eastern half of the United States .
Viola sempervirens, known by the common names redwood violet and evergreen violet, is a species in the genus Viola. It is native to the West Coast of the United States and British Columbia, Canada, and grows in closed-cone pine forest, California mixed evergreen forest, redwood forest, and Douglas fir forest communities. It has leathery purple ...
Viola glabella prefers moist, well-drained soil and can grow in part shade. Acidic and neutral soils are suitable for Viola glabella, which prefers a pH between 6 and 6.5, and becomes chlorotic if the pH is too high. [1] Young leaves and flower buds are edible, raw or cooked, but the yellow flowers can cause diarrhoea. [2]