• Chickweed
• Field Horsetail
• Lamb's Quarters
• Green Pigweed
• Redroot Pigweed
• Canada Thistle
• Velvetleaf
• Lady's Thumb
• Green Smartweed
• Tufted Vetch
• Three-Seeded Mercury
• Prickly Lettuce
• Common Ragweed
• Bur Cucumber

Broadleaf Weeds

Chickweed

1. young chickweed seedling	2. flowers are white with 5 two–lobed petals	3. ovate–pointed leaves
4. Chickweed forms a dense mat	5. spreading habit whereby rooting occurs at nodes that touch the ground	6. prostrate spreading or nearly erect

Field Horsetail

1. fruiting or reproductive spore producing stage	2. spores are shed in early May	3. juvenile stage	4. these shoots sprout up after fruiting stage
5. Field horsetail is highly competitive	6. green, slender, erect, hollow stems and leafless

Lamb's Quarters

1. young lamb's quarters seedling	2. first two or four true leaves are opposite	3. green or grayish in colour	4. flowers are green and densely grouped together
5. leaves are broadly triangular	6. Lamb's quarters in corn	7. covering of white mealiness or powderiness	8. sometimes with reddish undersurface on young plants
9. plants are branched or unbranched	10. common weed found throughout Canada

Green Pigweed

1. young plants somewhat shiny green or reddish-green colour	2. Green pigweed inflorescence is thinner and looser than redroot pigweed	3. found throughtout southern Ontario
4. terminal spike is longer	5. young plants have somewhat less hairy stem and leaves

Redroot Pigweed

1. Redroot pigweed seedling usually red near the roots	2. thick, coarse, bristly terminal panicle	3. duller green and dense short hairs on upper stem
4. each spike has many flowers

Canada Thistle

1. variations in spininess	2. variations in lobing	3. variations in hariness	4. variations in texture and colour
5. male and female flowers on separate plants	6. numerous flower heads	7. spread by seed and horizontal roots	8. stems erect, usually branched, slender and smooth
9. flowers from June to late autumn	10. seeds are light brown or straw-coloured and smooth

Velvetleaf

1. Velvetleaf seedling	2. flowers are yellow to yellow-orange with 5 petals	3. leaves alternate, heart-shaped and velvety to the touch	4. flowers single or in small clusters
5. erect growth habit	6. v-shaped seeds	7. in tilled crops and waste places	8. flowers from late July until autumn

Lady's Thumb

1. Lady's thumb seedling is reddish on underside	2. usually a reddish-to-brownish or purplish blotch near middle of leaf	3. leaves alternate and narrowly elliptic
4. flowers small, densely crowded pinkish to sometimes nearly white	5. occurs in cultivated land on nearly all soil textures throughout Ontario

Green Smartweed

1. smartweed seedling	2. flowers pale green to greenish-white	3. larger smartweed seedling
4. this green smartweed has the leaf blotch similar to lady's thumb	5. in fields, pastures and gardens throughout Ontario

Tufted Vetch

1. Tufted vetch seedling	2. bluish purple flowers clustered on one side	3. pinnately compound leaves
4. stems trail on the ground or climb using branching tendrils	5. leaves alternate	6. stems long, weak and wiry

Three-Seeded Mercury

1. seedling has round cotyledons	2. leaves glossy bronze-green	3. flower clusters in axils of the leaves
4. stems erect, simple or branched	5. stems slightly hairy	6. leaf margins have irregular, rounded teeth

Prickly Lettuce

1. Prickly lettuce seedling	2. spines on underside of leaves	3. leaves clasp the stem	4. flowers have 5-12 yellow florets
5. leaves alternate and variable in size and shape	6. full-grown plant	7. plants can grow up to 5 feet

Common Ragweed

1. lower leaves opposite and become alternate higher up	2. young ragweed seedling	3. leaves compound and finely divided	4. mature plants grayish green
5. young plants bright green to slightly yellowish-green	6. male and female seedheads on the same plant	7. all flowers within one flower head either only female or male	8. flowers Aug to Oct

Bur Cucumber

1. young seedling	2. leaf shape ranges from heart-shaped to pentagon-shaped	3. vine habit	4. clusters of 3-10 spiny fruits develop
5. male and female flowers separate and range in colour from white to green	6. Bur cucumber in corn	7. sometimes confused with wild or domestic cucumber	8. creeping into no till fields