Priority 1B weeds have limited presence in Montana. Management criteria will require eradication or containment, where present, and prevention and education elsewhere.
| Blueweed |
Echium vulgare |
| Japanese Knotweed Complex |
Polygonum cuspidatum |
| Rush Skeletonweed |
Chondrilla juncea |
| Scotch Broom |
Cytisus scoparius |
| Purple Loosestrife |
lythrum salicaria |
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