Contents
Description
Onopordum, commonly known as cotton thistle, is a genus of flowering plants that belong to the Asteraceae family. This plant genus is native to the Mediterranean region, and it is characterized by its tall, spiny stems and large, showy flowers. The cotton thistle is a biennial or perennial plant that is best known for its ornamental value, as it makes a striking addition to any garden or landscape. The plant’s unique appearance and hardiness make it an excellent choice for gardening enthusiasts who are looking for something a little different.
Taxonomic Information
| Domain | Eukarya |
|---|---|
| Kingdom | Plantae |
| Phylum | Angiosperms |
| Class | Eudicots |
| Order | Asterales |
| Family | Asteraceae |
| Genus | Onopordum |
Appearance
The cotton thistle is a tall plant that can grow up to six feet in height. Its stem is thick and spiny, and it is covered in a layer of soft, downy hairs. The plant’s leaves are also spiny and can grow up to a foot in length. The cotton thistle produces large, showy flowers that can range in color from white to pink to purple. The flowers bloom in the summer and fall, and they are a popular attraction for bees and other pollinators.
Care Guide
The cotton thistle is a hardy plant that can thrive in a variety of growing conditions. Here are some tips for caring for this unique plant:
- Water: The cotton thistle prefers well-drained soil that is kept moist but not waterlogged.
- Fertilization: The plant does not require much fertilization, but it will benefit from a light application of a balanced fertilizer in the spring.
- Soil: The cotton thistle prefers well-drained soil that is rich in organic matter.
- Sunlight: The plant prefers full sun but can tolerate some shade.
- Hardiness Zones: The cotton thistle is hardy in zones 6-10.
Common Pests & Diseases
The cotton thistle is relatively disease-resistant, but it can be susceptible to powdery mildew and rust. The plant is also attractive to aphids and other sap-sucking insects. Regular inspection and treatment with insecticidal soap can help to keep these pests under control.
Habitat
The cotton thistle is native to the Mediterranean region, where it grows in rocky, dry soil. The plant is well-adapted to hot, dry conditions, and it can tolerate drought and poor soil. The cotton thistle is often found growing in open fields, meadows, and along roadsides.
Question and Answer
Q: Can the cotton thistle be grown in pots?
A: Yes, the cotton thistle can be grown in pots, but it will require a large container and well-draining soil.
Q: Are cotton thistles invasive?
A: Cotton thistles can be invasive in some areas, particularly in regions with mild winters. It is best to check with your local extension office before planting this species.
Q: How long do cotton thistles live?
A: Cotton thistles are biennial or perennial plants that can live for several years with proper care.
Q: Are cotton thistles toxic?
A: There is no evidence that cotton thistles are toxic to humans or animals.
Related Plants
- Carduus
- Cirsium
- Echinops
- Silybum
References
- “Onopordum.” The Plant List. Accessed July 22, 2021. http://www.theplantlist.org/1.1/browse/A/Compositae/Onopordum/.
- “Onopordum acanthium – (L.)Lam.” Plants for a Future. Accessed July 22, 2021. https://pfaf.org/user/Plant.aspx?LatinName=Onopordum+acanthium.
- “Cotton Thistle.” Missouri Botanical Garden. Accessed July 22, 2021. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?kempercode=b602.
