The issue: Common tansy (Tanacetum vulgare), a creeping, spreading perennial from Eurasia, was introduced to the U.S. as an ornamental plant and for medicinal purposes.

The issue: Dyer’s woad (Isatis tinctoria) is a biennial from central Asian and Russia. Historically, it was used to produce a rich blue dye and was introduced to North America in the late 1600s for the same purpose. The plant has successfully invaded rangeland, pastures, cultivated fields an…

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Daybell Disappearance

Angie Dodge archive

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The issue: Summer is when weeds are most noticeable, mostly because they are large and that is the time we are out in our yards and fields. Annuals and seedlings are easy to kill. Biennials are usually going to seed during the summer months. Perennials are quite difficult to kill in the summer.

The issue: Common mallow or cheese weed (Malva neglecta) is a non-native weed that will germinate from spring through fall. Fall-germinated seedlings will overwinter and continue growth during the next spring. While it is an all-season annual, it may behave more like a biennial or even a sho…

The issue: Scotch thistle (Onopordum acanthium L.), is a non-native plant from Eurasia. This biennial, which can reach 12 feet, forms a rosette with large leaves and a deep taproot the first season. The leaves and stems are gray-green in color. Scotch thistle has very prominent stem “fins” a…