Thistles (Cirsium) - PictureThis

Thistles

Thistles are sometimes known as plume thistles, distinguishing them from plumeless thistles. The name comes from the Greek word kirsos, which means swollen vein, because of their distinctive flower head shape. Many plants in this genus are important pollinators, especially for monarch butterflies. They are the national symbol of Scotland.

Scientific classification

Genus

Thistles (Cirsium)

Family

Daisy

Order

Asters bellflowers fanflowers and allies

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2.5 cm to 8 cm

Flower Size

Deciduous

Leaf type

Summer

Growth Season

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Very spiny leaves and bracts

Artichoke-like flower heads

Robust form with varying flower colors

Distinctive spiky stem texture

Longitudinal grooves on green stem

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Care Guide for Thistles

Every week

Water

Water: Adapted to harsh conditions, thistles showcases remarkable drought tolerance, requiring weekly watering. Typically grown outdoors, thistles thrives in diverse temperatures due to its deep-root system, effectively utilizing available moisture to maintain vigor in environments with infrequent rainfall.

Propagation: Propagating thistles involves seed sowing and division. For seeds, maintain soil at 21°C (70°F) with light exposure; use well-drained soil. Division should occur in early spring. Collect seeds when dry, press into soil, and keep moist. Water regularly post-planting.

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How to Grow and Care

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Species

Quickly Identify Thistles

Care Guide for Thistles