Escaped plant

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Lantana camara can escape from gardens into nearby wildlands. Starr 040423-0244 Lantana camara.jpg
Lantana camara can escape from gardens into nearby wildlands.

An escaped plant is a cultivated plant that has escaped from agriculture, forestry or garden cultivation and has become naturalized in the wild. Usually not native to an area, escaped plants may become invasive. [2] Therefore, escaped plants are the subject of research in invasion biology. [3]

Contents

Some ornamental plants have characteristics which allow them to escape cultivation and become weedy in alien ecosystems with far-reaching ecological and economic consequences. Escaped garden plants may be called garden escapes [4] or escaped ornamentals. [5] Sometimes, their origins can even be traced back to botanical gardens.

Dispersal

Untended, overgrown plants can escape by rooting elsewhere (English ivy) Slowly the ivy overgrown.JPG
Untended, overgrown plants can escape by rooting elsewhere (English ivy)
Cairo Morning Glory can easily escape gardens by seed, runners and stem fragments. Flor do cerrado na beira do lago - panoramio.jpg
Cairo Morning Glory can easily escape gardens by seed, runners and stem fragments.

All escaped plants belong to the so-called hemerochoric plants. This term is used across the board for plants that have been introduced directly or indirectly by humans. The term also includes the unintentionally introduced plants that were introduced through seed pollution (speirochoric) or through unintentional transport (agochoric). [6]

Plants may escape from cultivation in various ways, including the dumping of green waste in bushland and road reserves and by birds or other animals eating the fruits or seeds and dispersing them. [7] Others are accidental hitchhikers that escape on ships, vehicles, and equipment. [8] Plants can also escape through sending stolons (runners), as stolons are capable of independent growth in other areas. [9] Garden escapees can be adventive, which means they can be established by human influence in a site outside their area of origin. [10] Some plants, such as the opium poppy Papaver somniferum , [11] :93 escaped from cultivation so long ago that they are considered archaeophytes, and their original source may be obscure. [11] :1123

Occasionally, seed contamination also introduces new plants that could reproduce for a short period of time. The proportion of adventitious species in open ruderal corridors at such locations can exceed 30% of the flora of these locations. Further, ornamental alien plants can easily escape their confined areas (such as gardens and greenhouses) and naturalize if the climate outside changes to their benefit. [12] In the US, there are over 5,000 escaped plants, many of which are escaped ornamentals. [13]

Ecological threats

Tradescantia fluminensis escapees infesting woodland area. Tradescantia fluminensis habit1 (16189587740).jpg
Tradescantia fluminensis escapees infesting woodland area.

Many invasive neophytes in Australia and New Zealand were originally garden escapees. The Jerusalem thorn forms impenetrable thorny thickets in the Northern Territory which can be several kilometers in length and width. Two other plants introduced as ornamental garden plants, Asparagus asparagoides and Chrysanthemoides monilifera , now dominate the herbaceous layer in many eucalyptus forests and supplant perennials, grasses, orchids, and lilies. [14]

Neophytes that compete aggressively, and which displace and repel populations of native species, may permanently change the habitat for native species and can become an economic problem. For example, species of Opuntia (prickly pears) have been introduced from America to Australia, and have become wild, thus rendering territories unsuitable for breeding[ clarification needed ]; the same goes for European gorse (Ulex europaeus) in New Zealand. [15]

Rhododendron species introduced as ornamental garden plants in the British Isles crowd out island vegetation. [16] The same can be seen in many acidic peatlands in the Atlantic and subatlantic climates. Robinia pseudoacacia was imported from America to Central Europe for its rapid growth, and it now threatens the scarce steppe and natural forest areas of the drylands. Examples in forests include Prunus serotina which was initially introduced to speed up the accumulation of humus.

In North America, Tamarisk trees, native to southern Europe and temperate parts of Asia, have proven to be problematic plants. In nutrient-poor heaths, but rich in grasses and bushes (fynbos) in the region Cape in South Africa, species of eucalyptus from Australia are growing strongly. As they are largely accustomed to poor soils, and in the Cape region they lack competitors for nutrients and parasites that could regulate their population, they are able to greatly modify the biotope. In Hawaii, the epiphytic fern Phlebodium aureum , native to the tropical Americas, has spread widely and is considered an invasive plant. [17]

Particularly unstable ecosystems, already unbalanced by attacks or possessing certain characteristics, can be further damaged by escaped plants if the vegetation is already weakened. In the humid forests of Australia, escaped plants first colonize along roads and paths and then enter the interior of the regions they surround. [18]

Thunbergia mysorensis , native to India, invaded the rainforests around the coastal city of Cairns in Queensland and even invades trees 40 m high. In Central Australia, the Eurasian species Tamarix aphylla grows along river banks, repelling native tree species, and wildlife that go together, lowers water levels and increases soil salinity. As in the United States, tamarisks have proven to be formidable bio-invaders. The fight against this species of trees, which has spread widely since, appears to be almost hopeless. [19] [20]

Escaped plants can fall within the definition of, and may have a relation to, these botanical terminologies below:

Wild tulips survive, multiply and grow wild without human influence. Tulipa - Wildtulpe.jpg
Wild tulips survive, multiply and grow wild without human influence.

Example species

Examples of escaped plants and/or garden escapees include:

See also

Bibliography

Related Research Articles

<span class="mw-page-title-main">Wildlife garden</span>

A wildlife garden is an environment created with the purpose to serve as a sustainable haven for surrounding wildlife. Wildlife gardens contain a variety of habitats that cater to native and local plants, birds, amphibians, reptiles, insects, mammals and so on, and are meant to sustain locally native flora and fauna. Other names this type of gardening goes by can vary, prominent ones being habitat, ecology, and conservation gardening.

<span class="mw-page-title-main">Introduced species</span> Species introduced by human activity

An introduced species, alien species, exotic species, adventive species, immigrant species, foreign species, non-indigenous species, or non-native species is a species living outside its native distributional range, but which has arrived there by human activity, directly or indirectly, and either deliberately or accidentally. Non-native species can have various effects on the local ecosystem. Introduced species that become established and spread beyond the place of introduction are considered naturalized. The process of human-caused introduction is distinguished from biological colonization, in which species spread to new areas through "natural" (non-human) means such as storms and rafting. The Latin expression neobiota captures the characteristic that these species are new biota to their environment in terms of established biological network relationships. Neobiota can further be divided into neozoa and neophyta (plants).

<i>Tamarix</i> Genus of plants

The genus Tamarix is composed of about 50–60 species of flowering plants in the family Tamaricaceae, native to drier areas of Eurasia and Africa. The generic name originated in Latin and may refer to the Tamaris River in Hispania Tarraconensis (Spain).

<i>Impatiens glandulifera</i> Species of plant

Impatiens glandulifera, Himalayan balsam, is a large annual plant native to the Himalayas. Via human introduction it is now present across much of the Northern Hemisphere and is considered an invasive species in many areas. Uprooting or cutting the plants is an effective means of control.

<i>Cenchrus setaceus</i> Species of grass

Cenchrus setaceus, commonly known as crimson fountaingrass, is a C4 perennial bunch grass that is native to open, scrubby habitats in East Africa, tropical Africa, the Middle East and south-western Asia. It has been introduced to many parts of the world as an ornamental plant, and has become an invasive species in some of them. It is drought-tolerant, grows fast, reaches 3 feet in height, and has many purple, plumose flower spikes.

<span class="mw-page-title-main">Synanthrope</span> Wild animal or plant that lives near and benefits from people

A synanthrope is an organism that lives near and benefits from humans and their environmental modifications. The term synanthrope includes many species regarded as pests or weeds, but does not include domesticated animals. Common synanthrope habitats include houses, gardens, farms, parks, roadsides and rubbish dumps.

Naturalisation is the ecological phenomenon through which a species, taxon, or population of exotic origin integrates into a given ecosystem, becoming capable of reproducing and growing in it, and proceeds to disseminate spontaneously. In some instances, the presence of a species in a given ecosystem is so ancient that it cannot be presupposed whether it is native or introduced.

The need for a clearly defined and consistent invasion biology terminology has been acknowledged by many sources. Invasive species, or invasive exotics, is a nomenclature term and categorization phrase used for flora and fauna, and for specific restoration-preservation processes in native habitats. Invasion biology is the study of these organisms and the processes of species invasion.

A cultigen or cultivated plant is a plant that has been deliberately altered or selected by humans. These plants have commercial value in horticulture, agriculture or forestry. They are defined by their mode of origin and not by where they grow. Plants meeting this definition remain cultigens whether they are naturalised, deliberately planted in the wild, or grown in cultivation.

<i>Lathyrus aphaca</i> Species of legume

Lathyrus aphaca, known as the yellow pea or yellow vetchling, is an annual species in the family Fabaceae with yellow flowers and solitary, pea-like fruits. It originated in the Middle East and has spread throughout Europe and beyond as a weed of cultivated fields and roadsides. The fruits are eaten as a supplement to diets in some parts of South Asia but are narcotic and potentially toxic in large quantities.

<span class="mw-page-title-main">Archaeophyte</span> Plant species

An archaeophyte is a plant species which is non-native to a geographical region, but which was an introduced species in "ancient" times, rather than being a modern introduction. Those arriving after are called neophytes.

<i>Echium plantagineum</i> in Australia Species of flowering plant

Paterson's curse or Salvation Jane is an invasive plant species in Australia. There are a number of theories regarding where the name Salvation Jane originated, and it is mostly used in South Australia. These explanations include "salvation jane" referring to the flower which looks similar to the bonnets of Salvation Army ladies, its “salvation” to beekeepers because it is often in flower when the honeyflow is down, and due to its use as a source of emergency food for grazing animals when the less drought-tolerant grazing pastures die off. Other names are blueweed, Lady Campbell weed, Riverina bluebell, and purple viper's bugloss.

<i>Lantana camara</i> Species of plant

Lantana camara is a species of flowering plant within the verbena family (Verbenaceae), native to the American tropics. It is a very adaptable species, which can inhabit a wide variety of ecosystems; once it has been introduced into a habitat it spreads rapidly; between 45ºN and 45ºS and more than 1,400 metres in altitude.

<i>Andropogon virginicus</i> Species of plant

Andropogon virginicus is a species of grass known by several common names, including broomsedge bluestem, yellowsedge bluestem and whiskey grass. It is native to the southeastern United States and as far north as the Great Lakes. It is known as an introduced species in California and Hawaii, where it is weedy.

<i>Antigonon leptopus</i> Species of flowering plant

Antigonon leptopus is a species of perennial vine in the buckwheat family commonly known as coral vine or queen's wreath. This clambering vine is characterized by showy, usually pink flowers that can bloom throughout the year and large, heart-shaped leaves. A. leptopus is native to the Pacific and Atlantic coastal plains of Mexico, but also occurs as a roadside weed from Mexico south to Central America. It is widely introduced and invasive throughout tropical regions of the world, including in the south and eastern United States, the West Indies, South America, and the Old World tropics of Asia and Africa. This species is utilized for its edible tubers and seeds, but also for its horticultural properties as an ornamental vine in warmer parts of the world.

<span class="mw-page-title-main">Neophyte (botany)</span> Non-native plant species introduced in recent history

In botany, a neophyte is a plant species which is not native to a geographical region and was introduced in recent history. Non-native plants that are long-established in an area are called archaeophytes. In Britain, neophytes are defined more specifically as plant species that were introduced after 1492, when Christopher Columbus arrived in the New World and the Columbian Exchange began.

<i>Centaurea macrocephala</i> Species of flowering plant

Centaurea macrocephala is a species of flowering plant in the family Asteraceae, and a member of the thistle tribe, Cardueae (Cynareae). It has many common names, including bighead knapweed, big yellow centaurea, lemon fluff, yellow bachelor's button, yellow hardhat, and Armenian basketflower.

Garden waste, or green waste dumping is the act of discarding or depositing garden waste somewhere it does not belong.

<span class="mw-page-title-main">Hemerochory</span> Propagation of plants by "the culture"

Hemerochory, or anthropochory, is the distribution of cultivated plants or their seeds and cuttings, consciously or unconsciously, by humans into an area that they could not colonize through their natural mechanisms of spread, but are able to maintain themselves without specific human help in their new habitat.

<span class="mw-page-title-main">Adventive plant</span>

Adventive plants or adventitious plants are plants that have established themselves in a place that does not correspond to their area of origin due to anthropogenic influence and, therefore, are all wild species that have only been established with the help of humans, in contrast to the native species.

References

  1. Lantana (Lantana camara) by Weed Management Guide
  2. Definition of escaped plant Archived 23 August 2021 at the Wayback Machine by Dave's Garden
  3. Mulvaney M (2001) The effect of introduction pressure on the naturalisation of ornamental woody plants in south-eastern Australia. In 'Weed Risk Assessment'. (Eds RH Groves, FD Panetta, JG Virtue). (CSIRO Publishing: Collingwood)
  4. garden escape by treeterms.co.uk. Philip Wilson in association with Orange Pippin & Warren IT Services. Retrieved 30 December 2023.
  5. Escaped Ornamentals by Washington State Noxious Weed Control Board. Retrieved 1 January 2024.
  6. Loss and degradation of native plant and animal habitat by invasion of escaped garden plants, including aquatic plants – Introduction Department of Agriculture, Water and the Environment
  7. Migratory birds disperse seeds long distances Science Daily, 22 March 2016
  8. Escaping Ornamentals: A Threat to Natural Area Biodiversity By Miriam Owsley, Outreach Assistant, Northwest Michigan Invasive Species Network. 23 November 2016.
  9. UTRICULARIA CONTAINMENT: TRYING TOPREVENT THE GREAT ESCAPE THOMAS M. CAHILL. Department of Integrated Natural Sciences. Arizona State University at the West Campus. Retrieved 16 December 2023.
  10. Wilhelm Lohmeyer, Herbert Sukopp: Agriophytes in the vegetation of Central Europe. First addendum. 2001 (Braunschweiger Geobotanische Arbeit 8), pp. 179–220
  11. 1 2 3 4 5 Stace, C. A. (2019). New Flora of the British Isles (Fourth ed.). Middlewood Green, Suffolk, U.K.: C & M Floristics. ISBN   978-1-5272-2630-2.
  12. Starfinger U, Kowarik I, Rode M, Schepker H. 2003. From desirable ornamental plant to pest to accepted addition to the flora? The perception of an alien plant species, Prunus serotina, through the centuries. Biol. Invas. 5:323–335
  13. Escaped Ornamentals Escaped Ornamentals: Is your garden harboring environmental pollutants? Washington State Noxious Weed Control Board
  14. Loss and degradation of native plant and animal habitat by the invasion of escaped garden plants, including aquatic plants – proposed key threatening process listing NSW Scientific Committee – preliminary determination by NSW Government
  15. Australia's weedy garden escapees by The Invasive Species Council
  16. Dehnen-Schmutz, Katharina; Perrings, Charles; Williamso, Mark (2004). "Controlling Rhododendron ponticum in the British Isles: an economic analysis". Journal of Environmental Management. 70 (4): 323–332. doi:10.1016/j.jenvman.2003.12.009. PMID   15016441.
  17. Kowarik I (2005) Urban ornamentals escaped from cultivation. In: Gressel J (ed) Crop Ferality and Volunteerism. CRC Press, Boca Raton, pp. 97–121.
  18. Rejmanek M, Richardson DM, Higgins, SI, Pitcairn, PJ, Grotkopp E (2005) Ecology of invasive plants: state of the art. In 'Invasive Alien Species. A New Synthesis' (Eds. HA Mooney, RN Mack, JA McNeely, LE Neville, PJ Schei, JK Waage), pp104-161. (Island Press, Washington DC)
  19. van Klinken, Rieks; Campbell, Shane; Heard, Tim; McKenzie, John; March, Nathan (2009). "The Biology of Australian Weeds: 54. 'Parkinsonia aculeata' L". Plant Protection Quarterly. 24 (3): 100–117.
  20. Griffin, G.F.; Smith, D.M.S.; Morton, S.R.; Allan, G.E.; Masters, K.A.; Preece, N. (1989). "Status and implications of the invasion of tamarisk (Tamarix aphylla) on the Finke River, Northern Territory, Australia". Journal of Environmental Management. 29 (4): 297–315.
  21. Handbook of Plant Palaeoecology, Flora and Vegetation, p.95 By R. T. J. Cappers, R. Neef
  22. Plant Ecology, p.496 By Ernst-Detlef Schulze, Erwin Beck, Klaus Müller-Hohenstein
  23. Wilhelm Lohmeyer, Herbert Sukopp: Agriophytes in the vegetation of Central Europe. Landwirtschaftsverlag, Münster-Hiltrup 1992, ISBN 3-7843-2073-2
  24. Potentials and Limitations of Ecosystem Analysis, Extinction and Naturalization of Plant Species p.261, edited by Ernst-Detlef Schulze, Helmut Zwölfer
  25. Ingolf Kühn, Stefan Klotz: Floristic status and alien species. In: Series of publications for vegetation science. 38 (2002), pp. 47–56.
  26. Harshberger, John William: The vegetation of the New Jersey pine-barrens, an ecologic investigation, Philadelphia: Christopher Sower Company, 1869–1929
  27. Tim Low: Feral Future. The Untold Story of Australia's Exotic Invaders, p. 73