- Invasive Species Management
- Noxious Weeds
- Noxious Weed Information
- Monthly Work Plan - Noxious Weeds
Monthly Work Plan - Noxious Weeds
Each month we will provide a work plan for the noxious weeds that are active.
January
Weed | Stage | Action | Plant Info | Notes |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Begin developing your management plan and timeline for 2022. We developed a guide to assist landowners. The information provides steps to develop a management plan for properties that have noxious weeds. Download your copy of "A Landowner's Guide - Developing a Noxious Weed Management Plan"
| ||||
February
March
| Weed | Stage | Action | Plant Info | Notes |
|---|---|---|---|---|
| Cheatgrass | Plants starting to form seed | Treat with herbicide - see Fact sheet for details | Annual (Winter annual) Fibrous roots Reproduces by seed | |
| Hoary cress | Pre-growth | Treat site with pre-emergent herbicide - see Fact sheet for details | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Myrtle spurge | Re-sprouting | Remove or treat with herbicide | Perennial Deep taproot Reproduces by seed, spreading roots, and plant fragments | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. Bag and dispose of in the trash |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Others | Visit our weed profile pages | |||
April
| Weed | Stage | Action | Plant Info | Notes |
|---|---|---|---|---|
| Canada thistle | New plants | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
| Chamomile | Seedlings | Remove or treat with herbicide | Perennial Fibrous roots Reproduces by seed | |
| Cheatgrass | Regrowth | Treat site with herbicide - see Fact sheet for details | Annual (Winter annual) Fibrous roots Reproduces by seed | |
| Common mullein | Rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Remove in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial Deep taproot with spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. |
| Diffuse knapweed | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Remove in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Hoary cress | New plants | Treat site with herbicide - see Fact sheet for details | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Houndstounge | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Leafy spurge | New plants | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Musk thistle | New rosettes | Remove flowers, bag, put into trash. Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Remove in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Myrtle spurge | Dropping seed | Remove or treat with herbicide | Perennial Deep taproot Reproduces by seed, spreading roots, and plant fragments | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. |
| Poison hemlock | New seedlings | Treat seedlings with herbicide | Biennial Taproot Reproduces by seed | |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Scotch thistle | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Remove in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Teasel | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Remove in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Others | Visit our weed profile pages | |||
May
Weed | Stage | Action | Plant Info | Notes |
Bull thistle | Bolting | Remove or treat with herbicide | Biennial | |
Canada thistle | Stems elongating. Starting to form flowers | Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Chamomile | Seedlings | Remove or treat with herbicide | Perennial Reproduces by seed | |
Cheatgrass | Mature plants | Remove - see Fact sheet for details | Annual (Winter annual) | |
Common mullein | Bolting and starting to flower | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Diffuse knapweed | Bolting, starting to flower | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Hairy willowherb | Sprouting new plants | Treat plants with herbicide | Perennial | |
Hoary cress | Mature plants, starting to go to seed | Treat with herbicide - see Fact sheet for details | Perennial | |
Houndstounge | Bolting, starting to form flowers | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Knotweed | New stems | Treat plants with herbicide | Perennial | |
Leafy spurge | Mature plants starting to produce seed | Treat plants with herbicide | Perennial | |
Musk thistle | Bolting, starting to form flowers | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Bag and dispose of any flower buds |
Myrtle spurge | Dropping seed | Remove or treat with herbicide | Perennial | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive.
Bag and dispose of in the trash |
Oxeye daisy | Young plants | Remove or treat plants with herbicide | Perennial | |
Poison hemlock | Bolting, beginning to flower | Treat with herbicide | Biennial | |
Russian olive | All stages | Cut at base and treat surface with herbicide. | Perennial | |
Scotch thistle | Young plants starting to form flowers | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Teasel | Young plants starting to form flowers | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Yellow toadflax | New plants | Treat with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Others | Visit our weed profile pages | |||
June
Weed | Stage | Action | Plant Info | Notes |
Bull thistle | Bolting | Remove or treat with herbicide | Biennial | |
Canada thistle | Stems elongating. Starting to form flowers | Mow – once a month through summer and treat in fall w/ herbicide or Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
Chamomile | Seedlings | Remove or treat with herbicide | Perennial Reproduces by seed | |
Cheatgrass | Mature plants | Remove see Fact sheet for details | Annual (Winter annual) | Plants will be beginning to drop their seeds |
Common mullein | Bolting and Flowering | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Diffuse knapweed | Bolting, starting to form flowers | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Hairy willowherb | Sprouting new plants | Treat plants with herbicide | Perennial | |
Hoary cress | Mature plants, starting to go to seed | Treat with herbicide - see Fact sheet for details | Perennial | |
Houndstounge | Bolting, starting to form flowers | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Knotweed | New stems | Treat plants with herbicide | Perennial | |
Leafy spurge | Mature plants starting to produce seed | Treat plants with herbicide | Perennial | |
Musk thistle | Bolting, starting to form flowers | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Bag and dispose of any flower buds |
Myrtle spurge | Dropping seed | Remove or treat with herbicide | Perennial | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. Bag and dispose of in the trash |
Orange hawkweed | Young plants | Treat plants with herbicide | Perennial |
|
Oxeye daisy | Young plants | Remove or treat with herbicide | Perennial | |
Poison hemlock | Bolting and beginning to flower | Treat with herbicide | Biennial | |
Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial | |
Scotch thistle | Flowering | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Teasel | Flowering | Remove or treat with herbicide | Biennial | Bag and dispose of any flower buds |
Yellow toadflax | New plants and flowering | Treat with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Others | Visit our weed profile pages | |||
July
Weed | Stage | Action | Plant Info | Notes |
Bull thistle | Flowering | Remove | Biennial | |
Canada thistle | Flowering | Mow – once a month through summer and treat in fall w/ herbicide or Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
Chamomile | Bolting to flowering | Remove | Perennial Reproduces by seed | |
Cheatgrass | Mature plants | Remove see Fact sheet for details | Annual (Winter annual) | Plants will be beginning to drop their seeds |
Common mullein | Flowering | Remove | Biennial | Bag and dispose of any flower buds |
Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Diffuse knapweed | Flowering | Remove | Biennial | Bag and dispose of any flower buds |
Hairy willowherb | Flowering | Treat plants with herbicide | Perennial | |
Houndstounge | Flowering | Remove | Biennial | Bag and dispose of any flower buds |
Knotweed | Flowering | Treat plants with herbicide | Perennial | |
Musk thistle | Flowering | Remove | Biennial Taproot Reproduces by seed | Bag and dispose of any flower buds |
Myrtle spurge | Dropping seed | Remove | Perennial | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. Bag and dispose of in the trash |
Orange hawkweed | Flowering | Treat plants with herbicide | Perennial |
|
Oxeye daisy | Flowering | Remove or treat with herbicide | Perennial | |
Poison hemlock | Flowering | Treat with herbicide | Biennial | |
Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial | |
Scotch thistle | Flowering | Remove | Biennial | Bag and dispose of any flower buds |
Teasel | Flowering | Remove | Biennial | Bag and dispose of any flower buds |
Yellow toadflax | Flowering | Treat with herbicide | Perennial | Do NOT pull. Pulling breaks the root and creates new plants. |
Others | Visit our weed profile pages | |||
August
| Weed | Stage | Action | Plant Info | Notes |
|---|---|---|---|---|
| Canada thistle (option 1) | Flowering, dropping seed | Clip, bag, and put into trash | Perennial Deep spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
| Canada thistle (option 2) | Flowering, dropping seed | Treat plants with herbicide | ||
| Canada thistle (option 3) | Flowering, dropping seed | Mow and follow up with herbicide treatment in 1 month | ||
| Chamomile | Flowering, dropping seed | Remove, bag, put into trash | Perennial Fibrous roots Reproduces by seed | |
| Common mullein | Flowering, dropping seed | Remove, bag, put into trash | Biennial Taproot Reproduces by seed | This is not the time of year to treat Common mullein with herbicide. Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Diffuse knapweed | Flowering, dropping seed | Remove, bag, put into trash | Biennial Taproot Reproduces by seed | This is not the time of year to treat Diffuse knapweed with herbicide. Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Hairy willowherb | Flowering, dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Knotweed | Flowering, dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Musk thistle | Flowering, dropping seed | Remove flowers, bag, put into trash | Biennial Taproot Reproduces by seed | This is not the time of year to treat Musk thistle with herbicide. Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Oxeye daisy | Flowering, dropping seed | Remove, bag, put into trash | Perennial Fibrous roots Reproduces by seed | |
| Purple loosestrife | Flowering, dropping seed | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Teasel | Flowering, dropping seed | Remove flowers, bag, put into trash | Biennial Taproot Reproduces by seed | This is not the time of year to treat Teasel with herbicide. Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| All Others | Map the locations and create a management plan for fall | |||
September
| Weed | Stage | Action | Plant Info | Notes |
|---|---|---|---|---|
| Bull thistle | Flowering, dropping seed | Clip, bag, and put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Bull thistle | Rosettes | Remove or treat with herbicide | ||
| Canada thistle | Dropping seed, Beginning to move resources to the roots | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
| Chamomile | Older plants dropping seed | Remove, bag, put into trash | Perennial Fibrous roots Reproduces by seed | |
| Chamomile | Seedlings | Remove or treat with herbicide | Perennial Fibrous roots Reproduces by seed | |
| Cheatgrass | Regrowth | Treat site with pre-emergent herbicide - see Fact sheet for details | Annual (Winter annual) Fibrous roots Reproduces by seed | |
| Common mullein | Older plants dropping seed | Remove, bag, put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Common mullein | Rosettes | Remove or treat with herbicide | ||
| Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial Deep taproot with spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. |
| Diffuse knapweed | Older plants dropping seed | Remove, bag, put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Diffuse knapweed | New rosettes | Remove or treat with herbicide | ||
| Hairy willowherb | Dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Hoary cress | Pre-growth | Treat site with pre-emergent herbicide - see Fact sheet for details | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Houndstounge | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Knotweed | Dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Leafy spurge | Beginning to move resources to the roots | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Musk thistle | Older plants dropping seed | Remove flowers, bag, put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Musk thistle | New rosettes | Remove or treat with herbicide | ||
| Myrtle spurge | Dropping seed | Remove or treat with herbicide | Perennial Deep taproot Reproduces by seed, spreading roots, and plant fragments | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. |
| Oxeye daisy | Dropping seed | Remove, bag, put into trash | Perennial Rhizomes Reproduces by seed and rhizomes | |
| Oxeye daisy | New seedlings | Treat plants with herbicide | ||
| Poison hemlock | New seedlings | Treat seedlings with herbicide | Biennial Taproot Reproduces by seed | |
| Purple loosestrife | Dropping seed | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Scotch thistle | Older plants dropping seed | Remove flowers, bag, put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Scotch thistle | New rosettes | Remove or treat with herbicide | ||
| Teasel | Dropping seed | Remove, bag, put into trash | Biennial Taproot Reproduces by seed | Next year plan on doing your removal in the spring and early summer before the flowerbuds form (when plants are less than 12 inches tall) |
| Teasel | New rosettes | Remove or treat with herbicide | ||
| Yellow toadflax | All stages | Treat with herbicide | Perennial Spreading roots Reproduces by seed and roots | Do NOT pull. Pulling breaks the root and creates new plants. |
| Others | Visit our weed profile pages | |||
October
| Weed | Stage | Action | Plant Info | Notes |
|---|---|---|---|---|
| Bull thistle | Rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Canada thistle | Moving resources to the roots | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. The majority of the seeds are sterile. Most seed drops near the mother plant |
| Chamomile | Seedlings | Remove or treat with herbicide | Perennial Fibrous roots Reproduces by seed | |
| Cheatgrass | Seedlings | Treat site with pre-emergent herbicide - see Fact sheet for details | Annual (Winter annual) Fibrous roots Reproduces by seed | |
| Common mullein | Rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Dalmatian toadflax | All stages | Treat plants with herbicide | Perennial Deep taproot with spreading roots Reproduces by seed and spreading roots | Do NOT pull. Pulling breaks the root and creates new plants. |
| Diffuse knapweed | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Hairy willowherb | Dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Hoary cress | Pre-growth | Treat site with pre-emergent herbicide - see Fact sheet for details | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Houndstounge | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Knotweed | Dropping seed | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Leafy spurge | Beginning to move resources to the roots | Treat plants with herbicide | Perennial Spreading roots Reproduces by seed and spreading roots | |
| Musk thistle | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | Before hard frost |
| Myrtle spurge | All stages | Remove or treat with herbicide | Perennial Deep taproot Reproduces by seed, spreading roots, and plant fragments | Wear gloves and long sleeves if pulling. The sap of this plant is corrosive. |
| Oxeye daisy | New seedlings | Treat plants with herbicide | Perennial Rhizomes Reproduces by seed and rhizomes | |
| Poison hemlock | New seedlings | Treat seedlings with herbicide | Biennial Taproot Reproduces by seed | |
| Purple loosestrife | Dropping seed | Treat plants with herbicide | Perennial Deep spreading roots Reproduces by seed, spreading roots, and plant fragments | |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Scotch thistle | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Teasel | New rosettes | Remove or treat with herbicide | Biennial Taproot Reproduces by seed | |
| Yellow toadflax | All stages | Treat with herbicide | Perennial Spreading roots Reproduces by seed and roots | Do NOT pull. Pulling breaks the root and creates new plants. |
| Others | Visit our weed profile pages | |||
November
Weed | Stage | Action | Plant Info | Notes |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Begin developing your management plan and timeline for 2022. We developed a guide to assist landowners. The information provides steps to develop a management plan for properties that have noxious weeds. Download your copy of "A Landowner's Guide - Developing a Noxious Weed Management Plan"
| ||||
December
Weed | Stage | Action | Plant Info | Notes |
| Russian olive | All stages | Cut at base and treat surface with herbicide. Chip and scatter | Perennial Deep roots Reproduces by seed | |
| Begin developing your management plan and timeline for 2022. We developed a guide to assist landowners. The information provides steps to develop a management plan for properties that have noxious weeds. Download your copy of "A Landowner's Guide - Developing a Noxious Weed Management Plan"
| ||||