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As an example, Quebec City in Canada is located in zone 4, but can rely on a significant snow cover every year, making it possible to cultivate plants normally rated for zones 5 or 6. But, in Montreal, located to the southwest in zone 5, it is sometimes difficult to cultivate plants adapted to the zone because of the unreliable snow cover.
In phytogeography, concerned with the geographic distribution of plant species, floristic provinces are used. The Sierra Nevada are primarily within the California Floristic Province, with the Rocky Mountain Floristic Province to the north, the Great Basin Floristic Province to the east, and Sonoran Floristic Province to the south.
[4]: 224 Many Sierra Nevada alpine plants have reddish or whitish leaves to protect them from damage from intense ultraviolet radiation in the alpine zone. [ 5 ] : 17 [ 11 ] Fleshy roots and underground organs store food in the form of starches and sugars, allowing the plant to quickly grow when snow melts. [ 5 ]
The Pinyon-Juniper Woodland Zone extends down to 5,000 feet (1,500 m) elevation. [4] Below 5,000 feet (1,500 m), there is not enough precipitation to support trees. The zones below this elevation are the Sagebrush Scrub Zone, Saltbush Scrub Zone, and the Alkali Sink Zone. These zones are distinguished by soil salinity. [4]
Some shrubs are deciduous (e.g. hawthorn) and others evergreen (e.g. holly). [2] Ancient Greek philosopher Theophrastus divided the plant world into trees, shrubs and herbs. [5] Small, low shrubs, generally less than 2 m (6.6 ft) tall, such as lavender, periwinkle and most small garden varieties of rose, are often termed as subshrubs. [6] [7]
2.4 Other trees and tree-like shrubs. 3 Selected shrubs. 4 Selected desert plants. 5 Selected perennials. Toggle Selected perennials subsection. 5.1 Sunny habitats.