Indiana's Terrestrial Plant Rule
312 IAC 18-3-25

The Terrestrial Plant Rule designates 44 species of plants as invasive pests. It is illegal to sell, gift, barter, exchange, transport, or introduce these plants in the state of Indiana without a permit from the Indiana Department of Natural Resources (IDNR) - Division of Entomology and Plant Pathology (DEPP).

View the Plant Rule fact sheet below for a listing of species affected by the rule, consequences of selling and/or growing, and more:

Indiana Terrestrial Plant Rule FAQ Sheet

Invasives 101

This page is a work in progress. Please visit again for updated info!

What defines an invasive? Invasive species are those that are non-native to the ecosystem under consideration, and whose introduction causes or is likely to cause economic or environmental harm or harm to human health.

How are invasive species spread? They can be introduced to an area by ship ballast water, firewood, accidental release, and by people. Human actions are the primary means of invasive species introductions.

The path by which an invasive species is introduced into new environments can be natural or man-made. Natural paths are those not aided by humans (i.e., wind, currents). Man-made (human initiated) are characteristically of two types: intentional, which is the result of a deliberate movement of a species by humans, such as the movement of species for the horticultural or pet trade; unintentional, which is the inadvertent movement of species as a byproduct of some other human activity (i.e., pests and dieseases in imported plants, transportation of firewood and other agricultural products)

CCHIRP, though concerned with all types of invasive species, focuses on removal of invasive plants in Indiana, and specifically to Clark County. Of the roughly 2,900 plant species growing outside of cultivation in Indiana, approximately 33% are non-native, but only a small fraction of those non-native plants are invasive. Invasive plants degrade and destroy thousands of acres of our natural plant communities in Indiana, and millions of dollars are spent each year to control them. The following are invasive plants that we've seen consistently in Clark County, and are targeting for control:

Japanese Stiltgrass
Microstegium vimineum Japanese Stiltgrass
Photo by Chuck Bargeron; University of Georgia

Description: Annual grass, 1-3''tall; grows in a branching, sprawling, mat-like manner. Native to Asia. Shade-tolerant. Typically found along ditches, trails, and streambanks in moist, wooded habitat.

Flowers: Tiny flowers arranged on slender stalks 1-3" long in summer.

Fruit: Produces 100-1000 seeds per plant, which can remain viable in the soil for 5+ years.

Callery (Bradford) Pear
Pyrus calleryana
Barbara H. Smith, ©2019, HGIC Clemson Extension

Description: Deciduous tree up to 30-ft. tall; leaves alternate, ovate, smooth, finely toothed and wavy-edged, shiny green above and paler below.

Flowers: White, 5 petals, in dense clusters, unpleasant odor.

Fruit:Large number; small, round, brown.

Autumn Olive
Elaegnus umbellataAutumn Olive
James R. Allison, GA DNR

Description: Medium to large, fast-growing, multi-stemmed, deciduous shrub. Native to Asia. Grows in numerous habitats. It can alter soil chemistry and reduce its suitability for other plants due to its nitrogen-fixing capabilities.

Flowers: White to yellowish-cream, tubular with no petals, Strong jasimine-like scent. Produced abundantly in the spring. Unpleasantly pungent.

Fruit: Bright red, fleshy, drupe-like achene.

Multiflora Rose
Rosa mutiflora
Multiflora Rose
James H. Miller; USDA, Forest Service

Description: Fast-growing, multi-stemmed shrub, up to 10 ft. tall. Occurs mostly in habitats that are not too wet or dry; can form dense thickets. Reproduces by seed falling to the ground and dispersed by wildlife.

Flowers: 5-petaled, white, often with pink blush. Each inflorescence has many flowers (hence multiflora).

Fruit: Achene surrounded by glossy, red hip which is ellipsoid to obovate.

Amur (Bush) Honeysuckle
Lonicera maackii

Bush Honeysuckle
A. A. Reznicek

Japanese Barberry
Berberis thunbergii Japanese Barberry
North Carolina Extension-Heather Mike

Burning Bush
Euonymus alatus
Burning Bush
NC State Extension
Winter Creeper
Euonymus fortunei Winter Creeper
NC State Extension

Garlic Mustard
Alliaria petiolata
Garlic Mustard
Chris Evans, River to River CWMA
Common Reed
Phragmities australis Common Reed

Japanese Honeysuckle
Lonicera japonica Japanese Honeysuckle
Wikipedia - Jeffdelonge

Poison Hemlock
Conium maculatumPoison Hemlock
Tree of Heaven
Ailanthus altissima Tree of Heaven
Ligustrum obtusifolium Privet


Clark County Soil and Water Conservation District, 9608 Highway 62, Charlestown, IN 47111
812-256-2330, ext. 3