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PlantSnap
Plant Care
Yellow thistle
(Cirsium horridulum)
Also Known As
Yellow thistle, Southern thistle, Horrid thistle, Rough bull thistle
About This Plant
Cirsium horridulum is a species of thistle native to North America. It is a biennial or short-lived perennial plant that can grow up to 6 feet (1.8 meters) tall.
Plant Care Instructions
Outdoor Size Range
3 to 6 feet (0.9 to 1.8 meters)
Light Requirements
Cirsium horridulum prefers full sun, but can tolerate partial shade.
Humidity Needs
This plant is adaptable to various humidity levels.
Fertilizing Schedule
This plant does not require much fertilizer. A light application of a balanced fertilizer in early spring can be beneficial.
Pruning Guidelines
Deadheading can encourage more blooms. Cut the plant back to the ground in late fall or early spring.
Common Pests and Diseases
Cirsium horridulum is relatively pest-free, but can be affected by aphids, spider mites, and thrips.
Indoor Size Range
Not suitable for indoor cultivation
Watering Schedule
This plant is drought-tolerant and does not require much watering. Water only when the soil is dry.
Temperature Range
Cirsium horridulum can tolerate a wide range of temperatures, from hot summers to freezing winters.
Growing Season
Cirsium horridulum grows in the summer and blooms in the fall.
Growing Difficulty Level
Cirsium horridulum is easy to grow and care for.
USDA Hardiness Zones
Cirsium horridulum is hardy in USDA zones 3 to 9.
Did You Know?
Cirsium horridulum is also known as the yellow thistle, but its flowers can range from pink to purple.
