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Poisonous Plants
in the Landscape
Vincent Mannino
County Extension Director
Fort Bend County
Poisonous Plants in the Landscape
Purpose
 To become familiar with
some of your poisonous
landscape plants
 To determine what parts
of the plant is poisonous
 To review the types of
poisonings
Plant Poisonings
Types of Poisonings
 Dermatitis (skin irritations)
 Internal Poisons
– Some act on the brain causing narcotic reactions and
other mental disturbances
– Some affect the spinal cord resulting in paralysis and
convulsions
– Some act as heart depressants and stimulants
– Some irritate the digestive tract and nervous system
Plant Poisonings
To prevent plant poisonings,
follow these safety tips:
 Know the names of all your plants
 Label plants for ease in identification
 Keep poisonous plants, seeds, and bulbs
away from children and pets
 Do not eat wild plants and mushrooms
 Teach children & pets not to eat plants
The Common
Poisonous Plants
in the
Landscape
Air Potato

Toxic Plant Part
– Raw fruit

Symptoms
– Abdominal pain
– Nausea
Used as a high-climbing
landscape plant
Algerian Ivy

Toxic Plant Part
– All parts

Symptoms
–
–
–
–
diarrhea
nervousness
Labored respiration
convulsions
Used as a shade-loving
vining groundcover
Allamanda

Toxic Plant Part
– all parts

Symptoms
– Nausea
– High temperature
– Dryness of mouth
Used as a flowering
climber
Amaryllis

Toxic Plant Part
– Bulbs
– Seeds

Symptoms
– Gastrointestinal problems
– Vomiting
– Diarrhea
Used as a spring-flowering
accent plant
Arborvitae

Toxic Plant Part
– needles

Symptoms
– Low blood pressure
– Convulsions
Used as an accent or
screen plant
Angel Trumpet

Toxic Plant Part
– All parts

Symptoms
– Blurring of vision
– Delirium
– Death
Used as a flower, semihardy accent plant
Azalea

Toxic Plant Part
– All parts

Symptoms
–
–
–
–
Nausea
Vomiting
Convulsions
Death
Used as a shade-loving
hedge or accent plant
Barberry

Toxic Plant Part
– All parts

Symptoms
– Depressant Action on
heart
Used as a sun-loving
hedge or accent plant
Black Locust

Toxic Plant Part
– Bark
– Seeds

Symptoms
– Nausea
– Weakness
– depression
Used as a flowering
specimen tree
Boxwood

Toxic Plant Part
– Leaves
– twigs

Symptoms
– Gastric problems
– Vomiting
Used as a shade or sun-loving
hedge or accent plant
Buckeye

Toxic Plant Part
– All parts

Symptoms
– Abdominal pain
– Nausea
Used as a native ornamental tree
Caladium

Toxic Plant Part
– All parts

Symptoms
– Burning in mouth & throat
– Vomiting
Used as a shade-loving
foliage plant
Calla-lily

Toxic Plant Part
– All parts

Symptoms
– Burning in mouth &
throat
– Vomiting
Used as a shade-loving
flowering plant
Castor Bean

Toxic Plant Part
– seeds

Symptoms
– Burning in mouth &
throat
– gastric and intestinal
problems
Used as a sun-loving,
large accent plant
Century Plant
(yucca)

Toxic Plant Part
– leaves

Symptoms
– vomiting, diarrhea
Used as a sun-loving,
large accent plant
Cherry

Toxic Plant Part
– leaves, bark, seeds

Symptoms
– gasping, nervous
breathing disorder
Used as a small flowering
ornamental tree
Caladiums

Toxic Plant Part
– all parts

Symptoms
– burning, irritation of
tongue
Used as a shade-loving,
foliaged accent pant
Clematis

Toxic Plant Part
– all parts

Symptoms
– gastrointestinal irritation
Used as a flowering climber
Sweet Autumn Clematis
Crinum Lily

Toxic Plant Part
– bulb

Symptoms
– Vomiting
– diarrhea
Used as a spring-flowering
accent plant
Delphinium

Toxic Plant Part
– all parts

Symptoms
– digestive upset
– nervous excitement or
depression
Used in cluster plantings as
sun-loving large accent plants
Elderberry

Toxic Plant Part
– All vegetative parts

Symptoms
–
–
–
–
Nausea
Vomiting
Nausea
vomiting
Used as a native plant
under tree lines
Elephant Ear

Toxic Plant Part
– all parts

Symptoms
– burning, irritation of
tongue
Used as a large
foliaged accent pant
English Ivy

Toxic Plant Part
– leaves
– stems
– fruit

Symptoms
–
–
–
–
–
headache
fever
anxiety
breathing difficulty
coma
Used as a shade-loving vining
groundcover or climber
Eucalyptus

Toxic Plant Part
– leaves

Symptoms
–
–
–
–
–
nausea
vomiting
diarrhea
weakness
respiratory difficulty
Used fragrant accent tree
Firethorn (pyracantha)

Toxic Plant Part
– berries

Symptoms
– stomach ache
– blistering of tongue
– vomiting
Used as a flowering &
fruiting security plant
Four-o-clock

Toxic Plant Part
– roots
– seeds

Symptoms
– vomiting
– diarrhea
– abdominal pain
Used in cluster plantings as
sun-loving flowering plants
Ginkgo

Toxic Plant Part
– fruit

Symptoms
– violent stomach pains
– kidney disorders
Used as a pest-tolerant
specimen tree for fall color
Gloriosa Lily

Toxic Plant Part
– all parts

Symptoms
– numbness of lips,
tongue and throat
– nervous system paralysis
Used as a shade-loving
spring flowering plants
Holly

Toxic Plant Part
– berries

Symptoms
– vomiting
– diarrhea
Both native & adapted small trees or shrubs
as accent plants & wildlife attractants
Honeysuckle

Toxic Plant Part
– all parts

Symptoms
–
–
–
–
–
diarrhea
pupil dilation
irregular heartbeat
respiratory failure
coma
Native & adapted vines or shrubs to attract
humming birds, moth, & butterflies
Hyacinths

Toxic Plant Part
– all parts

Symptoms
– numbness of lips,
tongue and throat
– nervous system paralysis
Used as spring-flowering accent plants
Hydrangea

Toxic Plant Part
– bark
– leaves

Symptoms
– gastric & intestinal upset
– convulsions
Used as a shade-loving
large flowering plants
Impatiens

Toxic Plant Part
– leaves
– stems
– roots

Symptoms
– vomiting
– diarrhea
Used as a shade-loving
flowers planted in clusters
Iris

Toxic Plant Part
– rhizomes

Symptoms
– severe digestive tract
discomfort
Used in cluster plantings as sun-loving,
moisture tolerant flowering plants
Jack-in-the-Pulpit

Toxic Plant Part
– all parts

Symptoms
– severe digestive tract
discomfort
Used as a native , moisture
tolerant accent plant
Juniper

Toxic Plant Part
– berries

Symptoms
– kidney damage
Used as a small ornamental tree
Lantana

Toxic Plant Part
– fruit

Symptoms
–
–
–
–
gastric upset
vomiting
diarrhea
circulatory collapse
Used in cluster plantings as sunloving, low-growing bedding plant
Lily-of-the-Valley

Toxic Plant Part
– all parts

Symptoms
–
–
–
–
–
Nausea
Vomiting
Diarrhea
irregular heartbeat & pulse
mental confusion
Used as a shade-loving accent plants
Lily

Toxic Plant Part
– all parts

Symptoms
– dizziness
– stomach pains
– collapse
Used as accent plants for spring bloom
Mahonia

Toxic Plant Part
– all parts

Symptoms
– depressant action on
heart
Used as a shade-loving ,
flowering/fruiting accent plants
Mimosa

Toxic Plant Part
– all parts

Symptoms
– intestinal irritation
Used as a flowering tree
Morning Glory

Toxic Plant Part
– seeds
– roots

Symptoms
–
–
–
–
hallucinations
vomiting
diarrhea
muscle tightness
Used as a full-sun flowering climber
Mountain Laurel

Toxic Plant Part
– leaves
– twigs
– flowers

Symptoms
– gastric upset
– paralysis
– convulsions
Used as a native sun-loving , small tree
Oleander

Toxic Plant Part
– all parts

Symptoms
–
–
–
–
–
dizziness
irregular heartbeat
nausea
convulsions
death.
A sun-loving plant used in cluster
plantings or as an accent plant
Ornamental Tobacco

Toxic Plant Part
– all parts

Symptoms
–
–
–
–
weakness
diarrhea
abdominal pain
paralysis
A sun-loving plant used in
clusters or single plantings
Periwinkle Vine

Toxic Plant Part
– all parts

Symptoms
– intestinal irritation
Used in cluster plantings as
shade-loving groundcover
Annual Periwinkle

Toxic Plant Part
– all parts

Symptoms
– Hallucinations
– damage to liver, kidney
and nervous system
Used in cluster plantings as
sun-loving border plants
Plumbago

Toxic Plant Part
– leaves
– stems

Symptoms
– stomach pain
Used in cluster plantings as sun-loving
large flowering accent plants
Privet

Toxic Plant Part
– fruit

Symptoms
–
–
–
–
–
–
nausea
headache
abdominal pain
vomiting
diarrhea
low blood pressure
Used in cluster plantings as
sun-loving large accent plants
Sago Palm

Toxic Plant Part
–
–
–
–

seeds
roots
trunk
pith
Symptoms
– headache
– vomiting
– stomach disorders
Used as a sun-loving large accent plant
Sweet Shrub

Toxic Plant Part
– seeds

Symptoms
– affects central nervous
system
– heart spasms
– increased heart rate
Used as a native accent plant
Trumpet Creeper

Toxic Plant Part
– All parts except fruit

Symptoms
– gastric irritation
– dilated pupils
– numbness in hands
Used as a native vining plant
Virginia Creeper

Toxic Plant Part
– berries
– leaves

Symptoms
–
–
–
–
–
nausea
bloody vomiting
abdominal pain
kidney damage
headache
Used as a native vining plant
Wisteria

Toxic Plant Part
– pods
– seeds

Symptoms
–
–
–
–
stomach pain
diarrhea
nausea
vomiting
Used as sun-loving accent or climber
Yew

Toxic Plant Part
– berries
– foliage

Symptoms
– death without symptoms
Used in cluster plantings as
sun-loving large accent plants
The End!
Questions??
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