Weed

Harm Caused

How Common

Difficulty of Control

Total

Ivy

Perennial climber/scrambler that strangles and shades out desirable plants.
(Score 9)

Very common.
(Score 8)

Waxy leaves, multiple root systems and large size when established can make ivy difficult to control.
(Score 9)

26

Coarse Grasses**

Annual and perennial grasses seed readily often infest garden beds, paths and waste places.
(Score 8)

Very common.
(Score 8)

Can be difficult to control.
(Score 8)

24

Bindweeds/
Convolvulus

Rapidly growing smothering vines.
(Score 8)

Very common.
(Score 8)

Can be difficult to spray when twined in desirable plants.
(Score 8)

24

Oxalis

Perennial spreads easily to beds and pots.
(Score 8)

Very common.
(Score 8)

Bulbed forms can re-sprout.
(Score 7)

23

Periwinkle

Rapidly growing scrambling climber smothers desirable plants.
(Score 8)

Common.
(Score 7)

Waxy leaves, multiple root systems and large size when established can make control difficult.
(Score 8)

23

Old Man’s Beard

Rapidly growing smothering vine.
(Score 8)

Common.

(Score 6)

Can be difficult to spray when twined in desirable plants.
(Score 8)

22

Thistles

Group of, often prickly, annual-perennial rosette weeds with taproots.
(Score 7)

Very common.
(Score 8)

Most are relatively easy to control.
(Score 7)

22

Tradescantia

Perennial spreading ground cover.
(Score 7)

Common.
(Score 7)

Water repellent leaves and large size when established can be difficult.
(Score 8)

22

Onion Weed

Perennial bulbed weed.
(Score 7)

Common.
(Score 7)

Waxy leaves and bulbs can make it hard to control.
(Score 8)

22

Blackberry

Prickly, scrambling woody perennial.
(Score 8)

Common in waste areas.
(Score 6)

Mature plants can be difficult to control.
(Score 8)

22

Agapanthus

Large rhizomes spread easily and crowd out desirable plants, spread into the environment.
(Score 8)

Common.
(Score 5)

Waxy leaves and large root systems make control difficult.
(Score 8)

21

Dock

Perennial with large taproot readily grows in beds and waste places.
(Score 6)

Very common.
(Score 8)

Moderately difficult to control once established.
(Score 7)

21

Dandelion

Perennial with large taproot readily grows in beds and waste places.
(Score 6)

Very common.
(Score 8)

Moderately difficult to control once established.
(Score 7)

21

Clovers

Group od annual-perennial low growing spreading weeds.
(Score 7)

Very common.
(Score 8)

Relatively easy to control.
(Score 6)

21

Bamboo

Bamboo is a large grass and spreads in tall clumps.
(Score 8)

Common.
(Score 5)

Hard to control.
(Score 7)

20

Chickweed

Rapidly spreading annual.
(Score 6)

Very common.
(Score 9)

Relatively easy to control by manual removal or herbicide.
(Score 5)

20

Cleavers

Rapidly scrambling annual with sticky seeds.
(Score 7)

Very common.
(Score 8)

Relatively easy to control by manual removal or herbicide.
(Score 5)

20

Nightshades

Shrubby perennials, poisonous.
(Score 8)

Common.
(Score 6)

Relatively easy to control.
(Score 6)

20

Bear’s Breeches

Large leafy plant spreads and shades out desirable plants.
(Score 7)

Common.
(Score 5)

Large root systems can make control difficult.
(Score 7)

19

Fathen

Rapidly growing spring annual.
(Score 6)

Very common.
(Score 8)

Relatively easy to control.
(Score 5)

19

Mallow

Family of annual-perennial shrub-spreading weeds.
(Score 7)

Common.
(Score 6)

Relatively easy to control.
(Score 6)

19