Weeds, Not Wildflowers

Invasives are everywhere! Here is a selection of common species that should be controlled in a natural area.

Image result for common ragweedCommon and Giant Ragweed (Ambrosia artemisiifolia and A. trifida)

Common Ragweed is a short annual at around three feet with ferny foliage and a greenish yellow flower spike. Each plant produces 3,500 seeds per year. Giant Ragweed can range from three feet up to 10 feet tall! Its large mid-green leaves are lobed in patterns of three or five. Firm flower spikes are yellowish green and form at the top of the plant for maximum wind dispersal. Each plant can produce up to 10,000 seeds. Ragweed is the bane of allergy sufferers in late summer and early fall with its copious pollen release.


Chicory (Cichorium intybus)

Chicory is that cornflower blue flower you see flourishing along roadsides, fields and can invade prairies. It is about a foot tall and has clusters of blue blossoms with squared off petals. It forms a rosette of hairy leaves and a deep tap root. Chicory tends to appear here and there, then in a couple of years can blanket an area. Biennial to perennial, it is native to Africa, Asia and Europe. Each plant can produce up to 3,000 seeds.


Queen Anne’s Lace (Daucus carota)

A biennial, Queen Anne’s Lace is often regarded as a beloved wildflower of roadsides and disturbed areas with its flat white delicate flowers and carrot-like foliage. In fact, it is native to Europe and Asia and can dominate prairies to the detriment of native wildflowers. Queen Anne’s Lace can produce up to 40,000 seeds per plant that can live up to two years in the soil, making it a persistent threat.


Common Reed Grass (Phragmites australis)

Common Reed Grass turns rich wetland habitats into monocultures that can change marsh hydrology and become fire hazards. It can reach up to 15 feet high with alternating green leaves along a hollow stem. It is blooming now with reddish flower plumes. It primarily spreads by roots and a single stolon can grow 10 feet in a year. Roots have been found up to 43 feet away from the main plant. Common Reed Grass also produces thousands of seeds per year. It requires aggressive treatment to eradicate.


Cattails (Typha x glauca, T. latifolia, and T. angustifolia)

Cattails rapidly fill in wetlands, basins, swales and ditches. The brown sausage-like flowers are blooming now above thin leaf blades. Spreading by thick colonies of starchy roots, they can be tough to eradicate. Because they can form large stands quickly, Cattails choke out native wetland species and can create monocultures not beneficial to birds and insects.


Are these weeds on your property? Contact us about developing a weed management plan today!


Written by Pizzo Group

The Pizzo Group is a family of four companies that restores ecosystems and provides sustainable landscape solutions that are both beautiful and functional. We do this at any job site, any size project and within any ecosystem. Our processes are collaborative and range from design through implementation.