Shrub: Difference between revisions

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}}</ref><ref>{{Cite web |date=2017-05-15 |title=What is a Subshrub? |url=https://worldoffloweringplants.com/subshrub/ |access-date=2022-04-29 |website=World of Flowering Plants |language=en-US}}</ref>
}}</ref><ref>{{Cite web |date=2017-05-15 |title=What is a Subshrub? |url=https://worldoffloweringplants.com/subshrub/ |access-date=2022-04-29 |website=World of Flowering Plants |language=en-US}}</ref>


Most definitions characterize shrubs as possessing multiple stems with no main trunk below.<ref name="Allaby2019" /> This is because the stems have branched below ground level. There are exceptions to this, with some shrubs having main trunks, but these tend to be very short and divide into multiple stems close to ground level without a reasonable length beforehand. Many trees can grow in multiple stemmed forms also while being tall enough to be trees, such as [[oak]] or [[ash (tree)|ash]].<ref name="Allaby2019" />
Most definitions characterize shrubs as possessing multiple stems with no main trunk below.<ref name="Allaby2019" /> This is because the stems have branched below ground level. There are exceptions to this, with some shrubs having main trunks, but these tend to be very short and divide into multiple stems close to ground level without a reasonable length beforehand. Many trees can grow in multiple stemmed forms also while being tall enough to be trees, such as [[oak]] or [[ash (tree)|ash]].<ref name="Allaby2019" />


==Use in gardens and parks==
==Use in gardens and parks==

Revision as of 05:16, 1 July 2025

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File:Cytisus scoparius2.jpg
A broom shrub in flower
File:Sheringham Park 1.JPG
A rhododendron shrubbery in Sheringham Park

A shrub or bush is a small to medium-sized perennial woody plant. Unlike herbaceous plants, shrubs have persistent woody stems above the ground. Shrubs can be either deciduous or evergreen. They are distinguished from trees by their multiple stems and shorter height, less than Template:Convert tall.[1][2] Small shrubs, less than Template:Convert tall are sometimes termed as subshrubs. Many botanical groups have species that are shrubs, and others that are trees and herbaceous plants instead.

Some define a shrub as less than Template:Convert and a tree as over 6 m. Others use Template:Convert as the cutoff point for classification.[2] Many trees do not reach this mature height because of hostile, less than ideal growing conditions, and resemble shrub-sized plants. Others in such species have the potential to grow taller in ideal conditions. For longevity, most shrubs are classified between perennials and trees. Some only last about five years in good conditions. Others, usually larger and more woody, live beyond 70. On average, they die after eight years.[3]

Shrubland is the natural landscape dominated by various shrubs; there are many distinct types around the world, including fynbos, maquis, shrub-steppe, shrub swamp and moorland. In gardens and parks, an area largely dedicated to shrubs (now somewhat less fashionable than a century ago) is called a shrubbery, shrub border or shrub garden. There are many garden cultivars of shrubs, bred for flowering, for example rhododendrons, and sometimes even leaf colour or shape.

Compared to trees and herbaceous plants, a small number of shrubs have culinary usage.Script error: No such module "Unsubst". Apart from the several berry-bearing species (using the culinary rather than botanical definition), few are eaten directly, and they are generally too small for much timber use unlike trees. Those that are used include several perfumed species such as lavender and rose, and a wide range of plants with medicinal uses. Tea and coffee are on the tree-shrub boundary;[4] they are normally harvested from shrub-sized plants, but these would be large enough to become small trees if left to grow instead.

Definition

Shrubs are perennial woody plants, and therefore have persistent woody stems above ground (compare with succulent stems of herbaceous plants).[2] Usually, shrubs are distinguished from trees by their height and multiple stems. 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 Template:Convert tall, such as lavender, periwinkle and most small garden varieties of rose, are often termed as subshrubs.[6][7]

Most definitions characterize shrubs as possessing multiple stems with no main trunk below.[2] This is because the stems have branched below ground level. There are exceptions to this, with some shrubs having main trunks, but these tend to be very short and divide into multiple stems close to ground level without a reasonable length beforehand. Many trees can grow in multiple stemmed forms also while being tall enough to be trees, such as oak or ash.[2]

Use in gardens and parks

An area of cultivated shrubs in a park or a garden is known as a shrubbery.[8] When clipped as topiary, suitable species or varieties of shrubs develop dense foliage and many small leafy branches growing close together.[9] Many shrubs respond well to renewal pruning, in which hard cutting back to a "stool", removes everything but vital parts of the plant, resulting in long new stems known as "canes".[10] Other shrubs respond better to selective pruning to dead or unhealthy, or otherwise unattractive parts to reveal their structure and character.[11]

Shrubs in common garden practice are generally considered broad-leaved plants, though some smaller conifers such as mountain pine and common juniper are also shrubby in structure. Species that grow into a shrubby habit may be either deciduous or evergreen.[12]

Botanical structure

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File:Scrub brush vegetation in south TX IMG 6069.JPG
Shrub vegetation (with some cactus) in Webb County, Texas.
File:Schlehenbusch.jpg
Blackthorn shrub (Prunus spinosa) in the Vogelsberg
File:Hortensie, blau.jpg
Hydrangea macrophylla
File:Zaubernuss.jpg
Winter-flowering Witch-hazel (Hamamelis)
File:Senecio angulatus by the coast.jpg
Senecio angulatus, a scrambling shrub by the sea (yellow-flowered).

In botany and ecology, a shrub is more specifically used to describe the particular physical canopy structure or plant life-form of woody plants which are less than Template:Convert high and usually multiple stems arising at or near the surface of the ground. For example, a descriptive system widely adopted in Australia is based on structural characteristics based on life-form, plus the height and amount of foliage cover of the tallest layer or dominant species.[13]

For shrubs that are Template:Convert high, the following structural forms are categorized:

  • dense foliage cover (70–100%) — closed-shrubs
  • mid-dense foliage cover (30–70%) — open-shrubs
  • sparse foliage cover (10–30%) — tall shrubland
  • very sparse foliage cover (<10%) — tall open shrubland

For shrubs less than Template:Convert high, the following structural forms are categorized:

  • dense foliage cover (70–100%) — closed-heath or closed low shrubland—(North America)
  • mid-dense foliage cover (30–70%) — open-heath or mid-dense low shrubland—(North America)
  • sparse foliage cover (10–30%) — low shrubland
  • very sparse foliage cover (<10%) — low open shrubland

List

Those marked with * can also develop into tree form if in ideal conditions. Template:Div col begin

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References

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  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ a b c d e f Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "citation/CS1".
  13. ↑ Chris Paul (2024). The Best Evergreen Shrubs for Front Yards. Shrubs Radar, a website all about shrubs.
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