North America Native Plant

Prickly Fanpetals

Botanical name: Sida spinosa

USDA symbol: SISP

Life cycle: annual

Habit: subshrub

Native status: Non-native, reproduces and persists in the wild in Canada âš˜ Non-native, reproduces and persists in the wild in Hawaii âš˜ Native to the lower 48 states âš˜ Non-native, reproduces and persists in the wild in Pacific Basin excluding Hawaii âš˜ Native to Puerto Rico âš˜ Native to the U.S. Virgin Islands  

Synonyms: Sida alba L. (SIAL6)  âš˜  Sida angustifolia auct. non Lam. p.p. (SIAN11)  âš˜  Sida spinosa L. var. angustifolia auct. non (Lam.) Griseb. p.p. (SISPA2)   

Prickly Fanpetals: A Scrappy Native with a Complicated Story Meet prickly fanpetals (Sida spinosa), a tough little plant that’s both beloved and bewildering depending on where you encounter it. This hardy annual to perennial herb has quite the reputation – some gardeners appreciate its resilience and wildlife value, while others ...

Prickly Fanpetals: A Scrappy Native with a Complicated Story

Meet prickly fanpetals (Sida spinosa), a tough little plant that’s both beloved and bewildering depending on where you encounter it. This hardy annual to perennial herb has quite the reputation – some gardeners appreciate its resilience and wildlife value, while others see it as nothing more than a persistent weed. Let’s dive into what makes this plant tick and whether it deserves a spot in your garden.

What Exactly Is Prickly Fanpetals?

Prickly fanpetals is a forb (that’s garden-speak for a non-woody flowering plant) that can live as either an annual or perennial depending on your climate. Don’t let the prickly part scare you – while the plant does have small spines on its stems, it’s not particularly aggressive. The fanpetals part refers to its small, cheerful yellow flowers that bloom throughout the growing season.

You might also see this plant listed under some botanical synonyms like Sida alba, but Sida spinosa is the name that’s stuck in most plant databases and field guides.

Where Does It Call Home?

Here’s where things get interesting. Prickly fanpetals is native to the lower 48 United States, Puerto Rico, and the U.S. Virgin Islands. However, it has also naturalized (meaning it’s moved in and made itself at home without invitation) in places like Canada, Hawaii, and various Pacific islands. You can currently find it growing in states from coast to coast, including Alabama, Arizona, California, Florida, Texas, New York, and many others.

The Garden Verdict: Friend or Foe?

This is where prickly fanpetals gets complicated. In areas where it’s native, it serves as a legitimate part of the local ecosystem. However, its reputation is decidedly mixed:

  • It’s considered a somewhat weedy plant that readily self-seeds
  • The flowers are small and not particularly showy
  • It tends to pop up in disturbed soils and less-than-ideal growing conditions
  • Its overall appearance is more wild meadow than polished garden

Wildlife and Pollinator Benefits

Before you write off prickly fanpetals entirely, consider its ecological contributions. According to wildlife studies, this plant provides about 5-10% of the diet for large animals, though they don’t typically use it for cover. The small yellow flowers also attract various pollinators, including small native bees and other beneficial insects, making it a modest contributor to pollinator support.

Growing Conditions and Care

If you’re in an area where prickly fanpetals is native and you’re considering adding it to a wildflower garden or naturalized area, here’s what you need to know:

Preferred Conditions:

  • Thrives in upland areas (almost never found in wetlands)
  • Tolerates poor, disturbed soils
  • Prefers full sun
  • Drought tolerant once established
  • Generally hardy in USDA zones 8-11 as a perennial, zones 6-7 as an annual

Planting and Care:

  • Requires minimal care once established
  • Self-seeds readily (sometimes too readily!)
  • No special soil preparation needed
  • Very low maintenance

The Bottom Line

Prickly fanpetals falls into that tricky category of plants that are native somewhere but not everywhere. If you live in its native range and want to support local wildlife with minimal effort, it could work in a casual wildflower setting. However, its weedy nature and modest aesthetic appeal make it a questionable choice for most home gardens.

If you’re in an area where prickly fanpetals isn’t native, consider exploring beautiful native alternatives instead. Your local native plant society or extension office can recommend gorgeous native wildflowers that will provide better pollinator support and fit more naturally into your local ecosystem.

For those who do choose to grow it, just remember: this little plant has wandering tendencies, so keep an eye on where those seeds might be heading!

Wildlife Status

Want to attract wildlife or keep hungry critters away from your garden? Understanding the relationship between plants and wildlife is key. While plant tags may indicate deer and rabbit resistance, they don't tell the full story. Every gardener has experienced the disappointment of purchasing "deer-resistant" plants only to find them nibbled to the ground!

The extent to which plants are resistant to animal browsing is a matter of degree. Likewise, the extent to which a plant attracts wanted visitors also varies. Whether you want a garden full or free of wildlife, learning about interactions between a plant and wild animals can help you make smarter choices for the garden you desire.

As shown below Shrubby Indian Mallow isn't a large food source for animals or birds. You can confidently add this plant to your garden and rest assured knowing it's unlikely to be devoured by four-legged visitors.

Small animals

not a food source

not a source of cover

Large animals

5-10% of diet

Infrequently used as cover

Terrestrial birds

not a food source

not a source of cover

Water birds

not a food source

not a source of cover

Sources:

Everitt, J.H., D.L. Drawe, and R.I. Lonard. 1999. Field guide to the broad leaved herbaceous plants of South Texas used by livestock and wildlife. Texas Tech University Press. Lubbock.

Prickly Fanpetals

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Dilleniidae

Order

Malvales

Family

Malvaceae Juss. - Mallow family

Genus

Sida L. - fanpetals

Species

Sida spinosa L. - prickly fanpetals

Plant data source: USDA, NRCS 2025. The PLANTS Database. https://plants.usda.gov,. 2/25/2025. National Plant Data Team, Greensboro, NC USA