Missouri ironweed (Vernonia missurica)

Missouri ironweed

Missouri ironweed (Vernonia missurica) is a perennial herbaceous plant that will grow from 91 to 183 cm tall. It thrives in full sun to partial shade in average to wet soil. Commonly found growing in river bottom woods sedge meadows and wet prairies. Attracts a variety of bees. Blooms showy clusters of purple feathery flowers in summer.

Scientific classification

Species

Missouri ironweed (Vernonia missurica)

Asters bellflowers fanflowers and allies

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Toxic to Humans

Toxicity

Weeds

Weed or not

Perennial

Lifespan

Herb

Plant Type

Mid summer, Late summer, Early fall

Bloom Time

91 cm to 1.5 m

Plant Height

Deciduous

Leaf type

5 - 32 ℃

Ideal Temperature

Spring, Summer

Growth Season

Moderate

Growth Rate

Images of Missouri ironweed

Attributes of Missouri ironweed

Growth Rate

In the spring and summer months, the missouri ironweed exhibits a moderate growth rate. This speed allows for steady but not overly rapid advancements in leaf development, height increase, and flowering. This rhythm cultivates a stout and hardy plant structure, enhancing its resilience to environmental stresses. Although growth may vary slightly between seasons, its moderate pace is consistent throughout its active growth period, thus enhancing its ecological value within its native region.

Toxicity

Missouri ironweed is a poisonous plant. The stem and leaves contain a mild toxin causing skin irritation (redness, itching, inflammation), typically resolving in a few days. Allergic individuals may experience more severe symptoms lasting over a week. Ingestion is also toxic but uncommon since the plant doesn't produce fruit to attract people or children.

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Care Guide for Missouri ironweed

Every week

Water

Full sun

Sunlight

5 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: Missouri ironweed originates from moist prairies and floodplains, thriving in consistently wet environments. Regular weekly watering is optimal for its lush growth. As an outdoor perennial, it benefits from rainwater, supporting robust growth during peak season.

Fertilize: Fertilize missouri ironweed with a balanced 10-10-10 formula at the growing season's start and midsummer, adjusting based on rainfall. Use granular or liquid types, ensuring even distribution. Water thoroughly after application to enhance absorption and prevent root burn, reducing fertilizer in autumn as growth slows.

Pruning: Missouri ironweed thrives with annual pruning done in early to late spring. Remove dead stems and thin for air circulation, enhancing flowering and preventing legginess. Use clean, sharp tools for minimal stress, ensuring healthy regrowth and a visually appealing garden specimen.

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