---
title: "Nonnative Plants — AP Enviro Definition & Exam Guide"
description: "Nonnative plants are species introduced outside their natural habitat; learn how they become invasive, outcompete natives, and show up in AP Enviro Unit 9."
canonical: "https://fiveable.me/ap-enviro/key-terms/nonnative-plants"
type: "key-term"
subject: "AP Environmental Science"
unit: "Unit 9"
---

# Nonnative Plants — AP Enviro Definition & Exam Guide

## Definition

In AP Environmental Science, nonnative plants are species introduced to an ecosystem from another region where they don't naturally occur. They become invasive when they thrive outside their normal habitat and threaten native species, often as generalist, r-selected competitors (EK EIN-4.A.1, EIN-4.A.2).

## What It Is

A nonnative plant is simply a species growing somewhere it didn't evolve. Someone (or something) moved it from its home range to a new [ecosystem](/ap-enviro/unit-2/natural-disruptions-ecosystems/study-guide/QpHtIjQYZUMm1mTZghkU "fv-autolink"). That's it. Being nonnative isn't automatically bad. Plenty of introduced plants just sit there or even help, like crops you eat.

The problem starts when a nonnative plant becomes **invasive**. Per EK EIN-4.A.1, a species is invasive when it can live, and sometimes thrive, outside its normal [habitat](/ap-enviro/key-terms/habitat "fv-autolink") AND it threatens [native species](/ap-enviro/unit-9/invasive-species/study-guide/MnPc6GXboWzcwD2ABEFo "fv-autolink"). The reason these plants are so good at taking over is usually their life strategy: EK EIN-4.A.2 notes invasive species tend to be generalist, r-selected species. Generalists eat or tolerate a wide range of conditions, and r-selected species reproduce fast with lots of offspring. Combine those traits in a place with no natural predators or competitors, and the nonnative plant outcompetes the natives for sunlight, water, and nutrients. Think kudzu blanketing the American South.

## Why It Matters

This term lives in Topic 9.8 (Invasive Species) inside [Unit 9](/ap-enviro/unit-9 "fv-autolink"): Global Change. It directly supports learning objective [AP Enviro](/ap-enviro "fv-autolink") 9.8.A, which asks you to explain the environmental problems invasive species cause and the strategies used to control them. Unit 9 is about how humans change ecosystems on a large scale, and invasive nonnative plants are a textbook example of that disruption. The big theme: introduce one fast-reproducing generalist into an ecosystem with no checks on it, and you can collapse local biodiversity.

## Connections

### r-selected vs. K-selected species (Unit 2)

Invasive nonnative plants are usually r-selected: fast reproduction, tons of offspring, quick spread. That's exactly the trait that lets them flood a new habitat before natives can respond. The same r/K framework you learned for population ecology explains WHY a nonnative plant turns invasive.

### Competition and resource use (Unit 2)

The harm nonnative plants do is just [competition](/ap-enviro/key-terms/competition "fv-autolink") turned up to maximum. They outcompete natives for sunlight, water, and nutrients (EK EIN-4.A.2). Understanding the competitive exclusion idea from population dynamics makes the invasive-species problem click.

### [Habitat Modification (Unit 9)](/ap-enviro/key-terms/habitat-modification)

Both are human-driven threats to biodiversity in Unit 9. [Habitat modification](/ap-enviro/key-terms/habitat-modification "fv-autolink") physically changes a landscape; nonnative plants change which species can survive there. Disturbed, modified habitats are also where nonnative plants invade most easily, so the two often work together.

### Loss of biodiversity (Unit 2 and Unit 9)

When a nonnative plant outcompetes natives, local [biodiversity](/ap-enviro/unit-2/intro-biodiversity/study-guide/c77aT0cHPSCwPKS87s5o "fv-autolink") drops. This links invasive species directly to the ecosystem-services and biodiversity concepts you cover earlier in the course.

## On the AP Exam

On multiple choice, expect stems that hand you a scenario (a plant introduced to a region with no natural predators that spreads rapidly) and ask why it succeeds. The answer ties back to it being a generalist, r-selected species. You may also be asked to pick a control strategy (mechanical removal, herbicides, or biological control using a natural predator), which aligns with EK EIN-4.A.3. On FRQs, this concept shows up through the life-strategy lens. The 2025 FRQ Q1 opened by asking about reproductive strategies of a K-selected species like the chickadee, and that r vs. K contrast is exactly the reasoning that explains why nonnative plants become invasive. You should be ready to describe a problem invasive plants cause AND propose a realistic control method.

## nonnative plants vs invasive species

Every invasive plant is nonnative, but not every nonnative plant is invasive. "Nonnative" just means introduced from somewhere else. "Invasive" adds the harm: it thrives outside its normal habitat AND threatens native species (EK EIN-4.A.1). A backyard tomato is nonnative in most places but not invasive. Kudzu is both.

## Key Takeaways

- A nonnative plant is any species growing outside its natural range; it only becomes invasive when it threatens native species (EK EIN-4.A.1).
- Invasive nonnative plants are usually generalist, r-selected species, which is why they reproduce fast and outcompete natives for resources (EK EIN-4.A.2).
- Nonnative plants can be controlled through human interventions like mechanical removal, herbicides, and biological control (EK EIN-4.A.3).
- This term lives in Topic 9.8 under Unit 9: Global Change and supports learning objective AP Enviro 9.8.A.
- Nonnative species can sometimes be beneficial, so don't assume "nonnative" automatically means harmful.

## FAQs

### What are nonnative plants in AP Environmental Science?

They're plant species introduced to an ecosystem from another region where they don't naturally occur. In AP Enviro, they matter most when they become invasive, meaning they thrive outside their normal habitat and threaten native species (EK EIN-4.A.1).

### Are all nonnative plants invasive?

No. "Nonnative" just means introduced from elsewhere, and many introduced plants cause no harm or are even beneficial. A nonnative plant only counts as invasive when it threatens native species, often by outcompeting them for resources.

### How are nonnative plants different from invasive species?

Nonnative is the broad category (introduced from another region), and invasive is a subset of nonnative species that actively harm native ones. Think of it this way: invasive plants are always nonnative, but nonnative plants aren't always invasive.

### Why are invasive nonnative plants so good at taking over?

Because they're usually generalist, r-selected species (EK EIN-4.A.2). Generalists tolerate many conditions, r-selected species reproduce quickly with lots of offspring, and in a new ecosystem they often have no natural predators or competitors holding them back.

### How do you control nonnative invasive plants on the AP exam?

EK EIN-4.A.3 says they're controlled through human interventions. For FRQs, name a specific method like mechanical removal (pulling or cutting), chemical control (herbicides), or biological control (introducing a natural predator from the plant's home range).

## Related Study Guides

- [9.8 Invasive Species ](/ap-enviro/unit-9/invasive-species/study-guide/MnPc6GXboWzcwD2ABEFo)

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