Vernonia Gigantea

Description

Vernonia Gigantea is a species of flowering plant in the family Asteraceae. It is native to South America and is commonly known as “Giant Ironweed” or “Tall Ironweed”. This perennial plant can grow up to 8 feet tall with a spread of up to 4 feet. It produces clusters of purple flowers that bloom in late summer and fall. Vernonia Gigantea is a great addition to any garden as it attracts butterflies and other pollinators.

Taxonomic Information

Appearance

Vernonia Gigantea has an upright growth habit with long, slender stems that are topped with clusters of small purple flowers. The leaves are lance-shaped and can grow up to 8 inches long. The flowers bloom in late summer and fall and are about 1/4 inch in diameter. The plant can grow up to 8 feet tall and has a spread of up to 4 feet. Vernonia Gigantea is a great choice for adding height and color to a garden.

Care Guide

Water

Vernonia Gigantea likes consistently moist soil, so it’s important to water it regularly. However, be careful not to overwater as this can lead to root rot.

Fertilization

Fertilize Vernonia Gigantea in the spring with a balanced, slow-release fertilizer. This will help promote healthy growth and vibrant blooms.

Soil

Vernonia Gigantea prefers well-draining soil that is rich in organic matter. If your soil is heavy or clay-like, consider adding compost or other organic matter to improve drainage.

Sunlight

Vernonia Gigantea prefers full sun to partial shade. Make sure it gets at least 6 hours of sunlight per day for optimal growth and flowering.

Hardiness Zones

Vernonia Gigantea is hardy in USDA zones 7-10.

Common Pests & Diseases

Vernonia Gigantea is generally resistant to pests and diseases. However, it may be susceptible to powdery mildew in humid conditions. To prevent powdery mildew, make sure to provide good air circulation around the plant and avoid overhead watering.

Habitat

Vernonia Gigantea is native to South America and can be found in wetlands, meadows, and along streams and rivers. It prefers moist, well-draining soil and full sun to partial shade.

Question and Answer

Q: Is Vernonia Gigantea deer resistant?

A: Yes, Vernonia Gigantea is deer resistant.

Q: Can Vernonia Gigantea be grown in containers?

A: Yes, Vernonia Gigantea can be grown in containers as long as the container is large enough to accommodate its size and the soil is well-draining.

Q: Does Vernonia Gigantea need to be pruned?

A: Vernonia Gigantea does not require regular pruning, but you can trim it back in the fall after it has finished blooming to keep it tidy.

Q: Can Vernonia Gigantea be propagated from cuttings?

A: Yes, Vernonia Gigantea can be propagated from softwood cuttings taken in the summer.

Related Plants

• Vernonia noveboracensis
• Vernonia baldwinii
• Vernonia fasciculata
• Vernonia lettermannii

References

• “Vernonia gigantea.” Missouri Botanical Garden, www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=m980.
• “Vernonia gigantea.” PlantFiles, www.garden.org/plants/view/195898/Vernonia-gigantea/.
• “Tall Ironweed.” Fine Gardening, www.finegardening.com/plant/tall-ironweed-vernonia-gigantea.