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[citation needed] Some bulbs – such as tulips – need cold winters to bloom, while others – such as freesia – can survive a freezing winter. [citation needed] Many domestic plants are assigned a hardiness zone that specifies the climates in which they can survive. Winter gardens are dependent upon the cultivation of winter-hardy plants.
There is a rapid cold hardening capacity found within certain insects that suggests not all insects can survive a long period of overwintering. Non-diapausing insects can sustain brief temperature shocks but often have a limit to what they can handle before the body can no longer produce enough cryoprotective components. The common fruit fly
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] The plant sold as Viola labradorica by nurseries is Viola riviniana. [8]
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 elatior grows to a height of 10 to 30 cm (4 to 12 in) from a creeping rhizome, with narrow, triangular leaves 7 to 15 mm (0.28 to 0.59 in) across. The flowers are produced in late spring to early summer, 10 to 15 mm (0.4 to 0.6 in) diameter, pale bluish or yellowish-white with a short, greenish or yellowish spur.
Viola glabella, the stream violet or pioneer violet, is usually found along streams or in moist woods in northeastern Asia and northwestern North America. Its petals are yellow on both sides, with the exception of dark purple nectar guides on the front of the lower three petals. The flowers arise from the same stems as the leaves.
Viola praemorsa is a species of violet known by the common names canary violet, [3] Astoria violet, [4] yellow montane violet, and upland yellow violet. [5] Description
This plant can show heterophylly: upper leaves can be different from lower leaves. The blade can be more or less elongated, from rounded to lanceolate, with crenate margin. At the base of the petiole there are stipules (5–15 mm long) of various form, from linear and entire stipules to stipules divided in many linear segments, pennate or palmate.