Plant Fact Sheets
For help in identification of invasive plants,
treatment, and protection suggestions for your property, explore the DCNR fact
sheets below. DCNR has deemed these trees,
shrubs, vines, herbs, and aquatic plants to be invasive on state lands. The species listed are managed by DCNR staff.
Amur maple (PDF)
, Acer ginnala, is a small
ornamental tree that spreads by numerous winged seeds.
Norway maple (PDF)
, Acer platanoides, a common
street and lawn tree that frequently escapes cultivation.
Sycamore maple (PDF)
, Acer pseudoplatanus, a tall
Eurasian tree invading urban and suburban woods in southern PA.
, Ailanthus altissima, grows
throughout PA. Another immigrant from China introduced as an
, Albizia julibrissin, has
escaped cultivation to invade roadsides and woodland edges in eastern PA.
White mulberry (PDF)
, Morus alba, is a
fast-growing species that will hybridize with our native red mulberry, Morus
Cork tree (PDF)
, Phellodendron amurense, P. japonicum, P. lavallei, these Asian trees are problematic in urban and natural areas in southeastern PA.
Bee-bee tree (PDF)
, Tetra dium daniellii, is an
uncommon landscape tree that is slowly spreading in south-central and
Butterfly bush (PDF) , Budd le ja davidii, has
numerous cone-shaped bunches of purple flowers that attract butterflies.
Winged euonymus or Burning-bush (PDF) ,
Euonymus alatus, a shrub from China and Japan imported for its bright
purple-red fall color and frequently found along streams and in woods mostly in
Privets (PDF ) , Lig ust rum species imported
from Europe and Asia are aggressive, thicket forming shrubs.
J e t bead (P DF ) , R ho d o t yp o s s ca nden s , is a
deciduous shrub with clusters of small black fruits and white four-petaled
M ultiflora rose (PDF) , Rosa multiflora, this
import from Asia has become a noxious weed in PA field, pastures and woodlan ds.
W ineberry (PDF) , R ubus pho en i colasi us,
imported from Asia for its raspberry-like fruit and now common on roadsides and
in woods and thickets.
Japanese spirae (PDF) , Spiraea japonica, was
imported from Japan for its pink flowers. It escapes from cultivation to
forest openings and mead ow s. Guelder rose (PDF) , V i b urn um o pulus, a tall
shrub with maple-like leaves imported from Eurasia and escaped to woods fields
Five-leaf akebia (PDF) , A keb i a quinata, a
woody twining vine from Asia that has escaped cultivation
to disturbed woods in southeastern PA.
Porcelain-berry (PDF) , Ampelopsis
brevipedunculata, a deciduous, woody, perennial vine in the grape family
imported from Asia.
Oriental bittersweet (PDF) , Celastrus orbiculatus, a
twining woody vine imported from Asia and rapidly replacing the native
bittersweet in woods and fencer ow s.
Wintercreeper (PDF) , Euony m us for tunei , is an
evergreen woody vine that aggressively invades forest edges and openings.
English ivy (PDF) , Hedera helix, is a common
evergreen climbing vine in the landscape that can smother native vegetation.
Japanese hops (PDF ) , Humulu s japonicus, is a
prickly vine that invades moist, sunny areas.
Japanese honeysuckle (PDF) , Lonicera japonica, a common
ornamental vine from Asia now an abundant weed in roadside thickets,
woods and fields across southern PA.
Mile-a-minute weed (PDF) , Persicaria perfoliata, a
slender annual vine with reflexed prickles was accidentally introduced from
Asia with nursery stock and now a noxious weed in PA.
Kudzu (PDF) , Pue r aria lobata, a vigorous
half-woody vine introduced from Asia for ornament, forage and erosion control
and now an uncommon but officially noxious weed in southeastern PA. Chinese and Japanese wisteria (PDF) , Wisteria
sinensis and W. floribunda, are long-lived woody vines with bright
purple flowers that can out-compete and smother native vegetation.
Small carpetgrass (PDF) , An t h r a xon his p idus, is
native to Asia. It is currently found in a few counties in southern PA,
usually alongside invasive sti ltgrass.
Cheatgrass and Povery br ome (PD F ) , B r omus t e ctoru m, and B. sterilis, accidentally introduced from Europe in ballast
soil or impure wheat seed shipments. A serious agricultural weed
in the Midwest and western states.
Japanese stiltgrass (PDF) , Mic r o stegium v imineum,
introduced from tropical Asia in packing material and spreading through moist
areas open woods and clearings across southeastern PA and probably
Chinese silvergrass (PDF) , M is canthus sinensis, is a
tall bunched grass that spreads through vigorous roots and rhizom es.
Wavyleaf basketgrass (P DF) , Opl i s menus undu latifolius,
is a fast-growing, creeping grass not yet in PA but found across the border in
Reed canary grass (PDF) , Phalaris arundinacea, forms
dense monocultures in wet habitats that disrupt waterways and degrade habitat
for native wildlife.
Common reed (PDF) , Phragm ites australis, a
very large perennial grass, forms extensive colonies in wetlands. The scattered
native American populations are being replaced by the vigorous European
Golden bamboo (PDF) , Phyllosta chys aurea, is a
very tall grass with round, hollow stems that spreads rapidly via its
Ravenna grass (PDF) , Sacch arum ravennae, is also
known as hardy pampas grass. It grows up to 10 feet tall and quickly colonizes
Tall fescue (PDF) , Schedon orus arundinaceus,
is a very common cool season perennial grass that adapts to a variety of
conditions and crowds out native vegetation.
Shattercan (PDF) , Sorg hum bicolor was
imported from Africa as a forage crop but is now a noxious weed in
Pennsylvania. Johnsongrass (PDF) , So r g hum h ale pen se, is
native to the Mediterranean region. It is designated as a noxious weed in
Goutweed (PDF) , Ae gopodium podagraria,
imported from Eurasia and frequently found in fields, thickets, woods and
roadsides throughout PA.
Garlic-mustard (PDF) , Alliaria petiolata, a weed
of shady moist spots in suburban gardens, woods and floodplains throughout
PA; introduced from Europe.
Wild chervil (PDF) , An thriscus sylvestris, is a
member of the carrot family that competes with native plants and carries a
virus that can infect some vegetable crops .
Musk thistle (PDF) , Carduus nutans, is also
known as nodding thistle from the way the flowers droop once mature.
Canada thistle (PDF) , Cirsium arvense, imported
from Eurasia (not Canada) now common and noxious weed in fields pastures and
roadsides throughout PA.
Bull thistle (PDF) , Cirsium vulgare, is a
large-flowered thistle with long spines and abundant seeds.
Poison hemlock (PDF) , Conium maculatum, was
brought to U.S. gardens from Europe in the 1800s it now invades
native plant communities in riparian woodlands, open floodplains and stream
Crown-vetch (PDF) , Coronilla varia, a
sprawling perennial native to southern Europe planted extensively
along highways. It spreads into open, grassland and prairie habitats.
Jimsonweed (PDF) , Datura stramonium, is a
state noxious weed that is highly toxic and frequently found in cultivated
fields and other disturbed sites.
Goats rue (PDF) , Galega officinalis, is a
state and federal noxious weed that is very poisonous to livestock.
Orange day-lily (PDF) , Hemorocallis fulva, is a
very hard perennial that grows in abundance along roadsides and old home sites.
Giant hogweed (PDF) , Heracleum mantegazzianum, 15
feet tall member of the carrot family introduced from Eurasia. Its sap can
cause blisters so it is listed as a federal and PA noxious weed.
Dame's-rocket (PDF) , Hesperis matronalis,
introduced from Europe to American gardens, now common
in low woods floodplains and roadside ditches throughout
Yellow flag iris (PDF) , Iris pseudacorus, is a
showy ornamental plant commonly found in wetlands, along pond edges, and other
wet areas where it can dominate.
Moneywort (PDF) , Lysimachia nummularia, goes
by many common names and was introduced into the U.S. from Europe as an
Purple loosestrife (PDF) , Lythrum salicaria, a
European perennial with a woody base that has escaped gardens and destroyed
large areas of waterfowl habitat by dominating wetlands and excluding all other
Star-of-Bethlehem (PDF) , Ornithogalum nutans and O.
umbellatum, garden bulbs from Europe that escape to infest lawns and
Japanese pachysandra (PDF) , Pachysandra terminalis, is
an evergreen perennial groundcover that can spread from cultivation into
natural areas if left uncontrolled.
Wild parsnip (PDF) , Pastinaca sativa, a
European import now a widespread and abundant weed of roadsides throughout PA.
Beefsteak plant (PDF) , Perilla frutescens, a
member of the mint family introduced from India now occasionally found in moist
shaded roadsides and woods.
Bristled knotweed (PDF) , Persicaria longiseta, is an annual
plant from Asia that can dominate wet, disturbed habitats. , Persicaria longiseta, is an annual
plant from Asia that can dominate wet, disturbed habitats.
Japanese and Giant knotweed (PDF) , Fallopia
japonica and F. sachalinensis, are extremely difficult weeds to
control. Imported from Japan they dominate stream and river banks
Carolina fanwort (PDF) , Cabomba caroliniana, is a
submerged, rooted plant native to the southeastern U.S. and sold for aquariums.
Didymo (PDF) , Di dymoshenia geminate, is a
microscopic alga called a diatom. It can form dense mats that smother
stream beds and native vegetation.
Brazilian water-weed (PDF) , Egeria densa, is a popular
aquarium plant that can grow vigorously and choke out native vegetation once it
reaches ponds, lakes and other waterbodies.
Hydrilla (PDF) , Hy dr illa verticillata, is a
submerged aquatic plant that resembles several other aquatic plants, making ID
Floating Primrose-willow (PDF) , Ludwigia
peploides ssp. glabrescens is indigenous to slow-moving waters
of the southeastern U.S. now found in across southern PA.
Curly pondweed (PDF) , Potamogeton crispus, an
aggressive European weed common in lakes, ponds and streams.