The plant trade can disrupt ecosystems when traded plants establish and spread outside their native ranges, or when plants and related materials carry pests and pathogens into new places. But importing a plant is not the same as causing an invasion: risk depends on what arrives, whether it survives and reproduces, and what happens after it becomes established. Evidence identifies horticulture and illegal plant trade as pathways of concern, but does not establish what share of global invasions is caused specifically by international plant commerce.
How does the plant trade disrupt ecosystems?
“Plant trade” covers more than one kind of movement. Ornamental horticulture is a documented pathway for moving living plants beyond their native ranges. Trade can also move organisms that are not the intended purchase: pests, parasites and pathogens may travel on plants or in associated material. These pathways can contribute to biological invasions and other environmental harms, but they are not interchangeable, and the available evidence does not rank their global effects.
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A 2024 article in BioScience on international ornamental plant trade identifies risks that include biodiversity loss, aquifer depletion, pollution, food-security concerns and access-and-benefit-sharing issues. Those risks extend beyond invasive plants; the article’s abstract-level findings do not establish a single global impact estimate for the ornamental trade.
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IPBES describes biological invasion as a sequence: transport, introduction, establishment and spread. A plant may be moved and introduced without establishing a self-sustaining population. Even establishment does not, by itself, mean the plant has spread or caused a documented ecological impact. “Invasive alien species” refers to alien species that spread and cause adverse impacts, not every non-native plant sold or planted.
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- Transport: A plant is moved beyond its native range, deliberately through trade or through another pathway.
- Introduction: It is released or escapes into the environment outside that range.
- Establishment: It survives and reproduces there.
- Spread and impact: Its population expands, potentially affecting native species or ecosystems.
The distinction matters: a list of traded non-native plants is not a list of invasive species, and a record of an invasive species does not by itself identify how it arrived.
What can move through plant trade?
| Pathway | What moves | What the evidence supports |
|---|---|---|
| Ornamental horticulture | Living plants intentionally moved for cultivation | Research identifies horticulture as a major pathway for introducing invasive plants; it also identifies broader environmental and social risks. |
| Plant-associated hitchhikers | Arthropods, parasites and pathogens carried on traded species or products | Botanic Gardens Conservation International (BGCI) warns these organisms may become harmful in a new area. |
| Illegal plant trade | Plants moved outside legal trade channels | BGCI associates illegal trade with conservation and biosecurity risks, including the introduction of invasive plants and pathogens. |
The table describes distinct concerns, not a measured comparison of their frequency or damage. BGCI’s technical review discusses inspection and phytosanitary documents in a UK context; it should not be read as a universal description of border rules. Requirements depend on jurisdiction and the particular plant or material being moved.
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What are the possible consequences?
Biodiversity and ecosystem disruption
Where an introduced plant becomes invasive, it can contribute to biodiversity loss and ecosystem change. IPBES calls invasive alien species “one of the five most important direct drivers of biodiversity loss.” That assessment concerns invasive alien species broadly, not plants moved through trade alone.
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The 2024 BioScience article identifies aquifer depletion, pollution and food-security concerns among risks associated with international ornamental plant trade. These are separate impact dimensions; the available findings do not provide comparable global totals for them or show that each applies to every traded plant.
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Conservation, livelihoods and biosecurity
BGCI’s Illegal Plant Trade Coalition describes illegal plant trade as contributing to species extinction, ecosystem disruption, loss of local economic revenue and cultural and traditional knowledge, as well as the introduction of invasive plants and pathogens and other biosecurity risks. This is the coalition’s description of the problem, not a quantified global breakdown of each effect.
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IPBES reported in 2023 that more than 37,000 alien species, including more than 3,500 invasive alien species, had been recorded worldwide. It also reported that invasive alien species were a major factor in 60% and the only driver in 16% of recorded global animal and plant extinctions. These figures describe invasive alien species across groups and pathways; they do not measure the contribution of plant trade.
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IPBES estimated that the global economic costs of invasive alien species exceeded US$423 billion annually in 2019. That estimate is for invasive alien species overall, not a bill attributable to plant commerce. The assessment synthesized more than 13,000 references with input from 86 experts from 49 countries, but its breadth does not turn its global invasion figures into trade-specific statistics.
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1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThe sources establish that horticulture and plant-associated movement can be relevant pathways. They do not provide a robust global percentage of invasive plant introductions attributable to international plant trade or a comparable breakdown by region and trade channel. It would therefore be misleading to present the global invasion totals as the impact of the plant trade.
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How can trade-related risks be reduced?
BGCI describes conservation horticulture, legitimate plant sales and coalition coordination as parts of the response to illegal plant trade. Its technical review also discusses inspection and plant-health biosecurity. These are broad approaches, not a single rulebook that applies in every country.
- Use legitimate channels: BGCI identifies legitimate plant sales and conservation horticulture as part of the response to illegal trade.
- Apply local plant-health requirements: Check the rules for the country and the specific plant or material being moved. BGCI’s inspection and phytosanitary-document discussion is UK-specific, so it cannot substitute for the requirements of another jurisdiction.
- Keep pathway and impact distinct: A plant’s origin or sale does not alone prove that it will become invasive; assess establishment, spread and impact separately.
Effective decisions require attention to both the intended plant and organisms that may travel with it. Because the cited sources do not compare control measures by effectiveness, they do not support ranking these approaches or claiming that any one eliminates the risk.
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