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Above the tree line, extreme winds preclude tree-like growth. [6]: 17 Constant winds hitting the plants limits their size and flattens their shape. [10]Small size or dwarfism is therefore an adaptive feature to the extremes, and most alpine plants are just a few inches tall.
Hilaria rigida is a long-lived, shrubby or bushy, clumping perennial grass producing coarse, erect stems reaching 1 m (3.3 ft) in maximum height. [4] [5] [6] It spreads from hard, woody rhizomes to form grayish, hairy, open, erect hummocks and clumps. [5] [6] The clumps can live to more than 100 years old. [5]
The flowers are produced in early summer in dense terminal corymbs; each flower is 5–10 mm diameter, with five rounded white petals; they have a mild, hawthorn-like scent. The fruit is a small pome , 4–12 mm across, bright red and berry-like, produced large quantities, maturing in the fall and often persisting well into the winter.
Aquilegia (common names: granny's bonnet, [2] columbine) is a genus of about 130 species [1] of perennial plants that are found in meadows, woodlands, and at higher elevations throughout the Northern Hemisphere, known for the spurred petals [3] of their flowers.
Spring flowering types also do well in areas with deciduous trees, where they flower and produce leaves before the trees completely leaf-out. Crocuses are grown in USDA winter zones 3–8. [118] Not all species are hardy in the upper zones; C. sativus is winter hardy in USDA zones 6 through 8, and C. pulchellus is hardy in zones 5 through 8. [92]
Tuberous begonias are frequently used as container plants. Although most Begonia species are tropical or subtropical in origin, the Chinese species B. grandis is hardy to USDA hardiness zone 6 and is commonly known as the "hardy begonia". Most begonias can be grown outdoors year-round in subtropical or tropical climates, but in temperate ...