# soft thistle (*Cirsium carolinianum*)

The soft thistle is a pretty flower with fluffy purple blooms. It grows in fields and meadows, attracting butterflies and bees that love its nectar.

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 2/5 · Low
- **Habitat:** Grasslands

![soft thistle](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Cirsium_carolinianum_2025.05.23.jpg&width=800)

Photo: Thiswasnotmyintention, CC BY 4.0 · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Cirsium_carolinianum_2025.05.23.jpg)

## Appearance

The soft thistle has pale purple to pinkish flower heads that are round and spiny, atop tall, ridged stems. Its leaves are deeply lobed and toothy, with soft, non-stinging prickles, distinguishing it from truly prickly thistles.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Tracheophyta
- **Class:** Magnoliopsida
- **Order:** Asterales
- **Family:** Asteraceae
- **Genus:** Cirsium

## Interesting facts

- Ancient Greeks used thistles for medicine, believing they could cure swollen veins!
- Some moth and butterfly caterpillars are tough enough to munch on thistle leaves safely.
- Thistles are incredibly tough plants, able to grow in disturbed soil where few others can!
- Tiny thistle seeds are a favorite snack for many birds, especially American Goldfinches!

## Special abilities

- **Parachute Seeds:** Soft thistle can produce fluffy seed parachutes that help its seeds float far away on the wind to find new places to grow.
- **Spiny Shield:** Soft thistle has spiny leaves and flower heads that deter hungry animals from eating its precious parts, helping it survive.
- **Deep Drinker:** Soft thistle can grow long taproots that reach deep into the soil to find water and nutrients, helping it thrive in dry areas.

## Measurements & details

- **Height:** 60-200 cm
- **Spread:** 30-60 cm
- **Flower Size:** 2-4 cm
- **Bloom Season:** Summer
- **Edible:** No
- **Toxicity:** None
- **Lifecycle:** Biennial
- **Pollination Method:** Insect

## Ecological connections

- **Pollinates:** Honey Bee (*Apis mellifera*) — Collects nectar and pollen.
- **Pollinates:** [Monarch Butterfly](https://www.snappit.app/explore/monarch-butterfly) (*Danaus plexippus*) — Visits flowers for nectar.
- **Eats:** [American Goldfinch](https://www.snappit.app/explore/american-goldfinch) (*Spinus tristis*) — Feeds on ripe thistle seeds.
- **Eats:** Painted Lady Butterfly (*Vanessa cardui*) — Larvae feed on thistle leaves.

## Traits

- [Flowering](https://www.snappit.app/explore/traits/flowering): Flowering plants are any plants that produce flowers as part of their reproductive cycle.
- [Biennial](https://www.snappit.app/explore/traits/biennial): Biennial plants complete their life cycle over two growing seasons, typically forming foliage in the first year and flowering/seeding in the second.
- [Summer Blooming](https://www.snappit.app/explore/traits/summer-blooming): Summer blooming plants produce their flowers during the summer season, often providing vibrant color when many other plants have finished.
- [Fragrant Flower](https://www.snappit.app/explore/traits/fragrant-flower): Fragrant flowers emit a pleasant aroma, often to attract pollinators or for defense.
- [Grassland](https://www.snappit.app/explore/traits/grassland): Grassland habitats are terrestrial biomes dominated by grasses and herbaceous plants, supporting a variety of grazing animals.
- [Pollinator Magnet](https://www.snappit.app/explore/traits/pollinator-magnet): Describes plants that are particularly attractive and beneficial to a wide range of pollinating organisms.

## Collections

- [Plants](https://www.snappit.app/explore/collections/plants)

## Safety

**Danger:** 2/5 · Low

Be careful not to touch the prickly parts of the thistle, as they can be sharp.

## Frequently Asked Questions

### How to identify soft thistle?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

### How tall is soft thistle?

60-200 cm

### How wide does soft thistle spread?

30-60 cm

### How big are the flowers on soft thistle?

2-4 cm

### When does soft thistle bloom?

Summer

### Is soft thistle edible?

No

### Is soft thistle toxic?

None

### What is soft thistle's lifecycle?

Biennial

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Soft Thistle: Facts & Places to See — Snappit](https://www.snappit.app/explore/soft-thistle)