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Wavyleaf thistle
Also known as: Tracy's Thistle, Gray thistle
Wavyleaf thistle (Cirsium undulatum) is a perennial shrub that will grow to 1.8 m tall. It takes about 7 to 10 years to bloom and only blooms once before dying. Blooms appear in summer. It grows from seed and from deep underground running roots called rhizomes. Birds are attracted to the seeds.
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61 cm to 1.5 m
Plant Height
30 cm to 45 cm
Spread
Green, Blue
Leaf Color
2.5 cm to 5 cm
Flower Size
White, Pink, Purple
Flower Color
Semi-evergreen
Leaf type
20 - 35 ℃
Ideal Temperature

Images of Wavyleaf thistle

Distribution of Wavyleaf thistle

Distribution Map
Wavyleaf thistle is a plant species native to North America, where it predominantly establishes itself in the central and northern regions, encompassing prairies and grassland ecosystems. It has not been widely documented as introduced or naturalized in other major regions outside its native range.
Native
Cultivated
Invasive
Introduced
No species reported
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Habitat
Prairies, pastures, roadsides
Hemisphere Trend Curve

Culture

Symbolism
Strength, Protection, Hex Breaking
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Weed Control

Wavyleaf thistle hails from North America, primarily spanning across the western regions of Canada and the United States. This plant is classified as a weed due to its invasive nature, displaying features of rapid and daily reproduction. With a high tolerance for various environmental conditions, it quickly and exponentially colonizes and spreads, often outcompeting other indigenous plant species for resources. It poses a rather significant threat to other plants in a garden, as its aggressive growth habit can lead to it dominating and smothering other plant life. Noted for its harmful impact, its extensive root system can alter soil composition, making areas less hospitable for other plants. Further ensuring its swift proliferation, wavyleaf thistle employs the wind for dispersion. Each mature plant can produce up to 1,500 seeds, which are equipped with pappi - bristles that act as parachutes, facilitating wind-led dispersal. These seeds can travel significant distances, thus further spreading the plant's influence.
How to Control It
The best season to remove wavyleaf thistle or Wavyleaf thistle is during early summer before the plant has the chance to flower and disperse seeds. Here are some methods you can use for managing this plant:
  1. Hand-pulling: With gloves, pull out the entire plant including the root system. Making sure not to leave pieces behind as they can re-grow.
  2. Mowing: Regular mowing might weaken the plant over time. This will also prevent it from flowering and spreading seeds.
  3. Salt Solution: Create a solution of water and salt. Directly apply this solution to the roots of the plant. The salt will dehydrate the roots preventing further growth.
  4. Vinegar Solution: Similar to the salt solution, vinegar can also be used to kill wavyleaf thistle. Apply the vinegar solution directly to the leaves and roots of the plant.
  5. Mulching: Lay down a thick layer of mulch around the plant. This blocks sunlight and prevents photosynthesis thus preventing the growth of wavyleaf thistle.
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Care Guide for Wavyleaf thistle

Every week
Water
Full sun
Sunlight
20 - 35 ℃
Ideal Temperature
Water: Wavyleaf thistle thrives with moderate watering every week, balancing its need for moisture and drought tolerance. While suited for outdoor growth, consider natural rainfall during the active growing season, as water requirements may increase with consistent hydration needed for health and vigor.
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