We need your input

Help us review the last five years and plan for the future! learn more »

Invasive Species Research Conference

Turning Science into Action! Co-hosted by Thompson Rivers University and the Invasive Species Council of BC. learn more »

Parrot's Feather

A popular aquatic garden plant that spreads with water currents, animals, boats/trailers and fishing gear. Dense stands can stagnate water, and increase breeding grounds for mosquitoes

Zebra/Quagga Mussels

These tiny freshwater mussels clog drains, damage infrastructure, and are very costly to control/eradicate learn more »

Giant Hogweed

A towering toxic invasive plant with WorkSafe BC regulations learn more »

We need your input

Help us review the last five years and plan for the future! learn more »

European Fire Ant

A tiny ant with a toxic sting learn more »

Purple Loosestrife

An aggressive wetland invader that threatens plant and animal diversity learn more »

Orange Hawkweed

Also yellow, these invasive plants replace native vegetation along roadsides, and threaten areas not yet reforested learn more »

Japanese Knotweed

Grows aggressively through concrete, impacting roads and house foundations learn more »

Spotted Knapweed

A single plant spreads rapidly with up to 140,000 seeds per square metre learn more »

Scotch Broom

An evergreen shrub that invades rangelands, replaces forage plants, causes allergies in people, and is a serious competitor to conifer seedlings learn more »

Key Horticulturally Invasive Plants

Learn about a few key invasive plants impacting horticulture, including Baby's Breath; Butterfly Bush; English Ivy; and Himalayan Blackberry. Please help prevent (alert species): Common Morning Glory and Tree of Heaven. For distribution of these and other invasive plants impacting horticulture in BC, please refer to the Grow Me Instead booklet.

Baby’s Breath (Gypsophilia paniculata) 
Beautiful herbaceous perennial with delicate white or pink blooms on a bushy flower stalk which makes it sought after by garden enthusiasts and florists alike. That said, it is very drought tolerant in hot, dry climates such as the Okanagan. The large tap root can extend to 4m and rob other plants of minerals, nutrients, space and water thus outcompetes with other plants. The roots are allopathic and the entire plant is not palatable to most livestock. An average plant produces ~ 13,700 seeds which spread easily as the plant stalk naturally breaks off sending the plant tumbling across the landscape. Given time the plant can quickly become a difficult to control monoculture.

ALTERNATIVES: Pearly Everlasting, Filigran Russian Sage, Hewitt’s Double Meadow Rue, Sea lavender, White Flax, Hybrid Yarrow, and German Statice.
 

Butterfly Bush (Buddleia Davidii)
A known invasive in the Lower Mainland where the climate and growing conditions allow for rapid spread of this plant along riparian corridors, open and disturbed areas and along coastal forest edges, and roadsides. This plant has recently escaped cultivation and spreads by large amounts of windborne seed. Once established this plant displaces native vegetation, supplants other plants as a nectar source thus reducing their pollination and outcompetes native vegetation.

ALTERNATIVES: Lewis’s Mock Orange, Red-Flowering Current, Black Chockberry, Meyer Lilac, California Lilac, Blue Elderberry, Weigela, Rose of Sharon, and Oceanspray.
 

English Ivy (Hedera helix)
A plant commonly used for ground and building/wall covers that quickly smothers other plants and robs them of light, space, nutrients and minerals. Invasive in much of SW BC, the plant assumes two types of complex root growing habits: horizontal and vertical, the latter being its reproductively mature state which can quickly overtake and debilitate or choke out trees and infrastructure. The plant also produces a large volume of seed which is eaten and widely distributed by a number of wildlife species. 

ALTERNATIVES: Salal, Deer Fern, Purple Wintercreeper Euonymus, Taiwan Creeping Raspberry, Privet Honeysuckle, Boston Ivy, Barrenwort, western honeysuckle, and the piggy-back plant.
 

Himalayan Blackberry (Rubus armeniacus)
Highly valued for its delicious and numerous berries and for its ability to act as a security measure on properties, this plant quickly takes over many habitats. It out-competes with low growing native vegetation and prevents their re-establishment. Plants can grow to 5 m in height with canes reaching up to 12 feet in length that root wherever they touch the ground and create impenetrable thickets for people and wildlife.

ALTERNATIVES: Nootka Rose, Thimbleberry, Marionberry or Boysenberry, Red Raspberry, Black Huckleberry, Black Raspberry, Salmonberry, Blueberry, and other berries.
 

Please Prevent (alert species):

Common Morning Glory (Calystegia sepium)
A herbaceous perennial, this plant is a species of bindweed that rapidly and effectively twines around other plants, in a counter-clockwise direction, to a height of up to 2–4 m. Because of its quick growth, clinging vines and broad leaves, it can overwhelm and pull down cultivated plants including shrubs and small trees. Due to its aggressive self-seeding (seeds can remain viable as long as 30 years) and the success of its creeping roots (they can be as long as 3–4 m) the plant is a persistent weed.
 

Tree of Heaven (Ailanthus altissima)
This tree grows quickly (capable of reaching heights of 15 metres (49 ft) in 25 years), develops many suckers and emits a foul smelling odor. It can rapidly colonise disturbed areas  and suppress competition with allelopathic chemicals. When cut, the tree resprouts vigorously thus making its eradication very difficult, costly and time consuming. 


 

Refer to the Grow Me Instead Booklet or Snapshot Brochure to learn about more of the 'unwanted' horticulturally invasive plants in BC. Thank you for being 'PlantWise!'