North America Non-native Plant

Hairy Beggarticks

Botanical name: Bidens pilosa

USDA symbol: BIPI

Life cycle: annual

Habit: forb

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

Synonyms: Bidens odorata Cav. (BIOD)  âš˜  Bidens pilosa L. var. bimucronata (Turcz.) Sch. Bip. (BIPIB)  âš˜  Bidens pilosa L. var. minor (Blume) Sherff (BIPIM)  âš˜  Bidens pilosa L. var. pilosa (BIPIP2)   

Hairy Beggarticks: The Sticky Situation in Your Garden Meet hairy beggarticks (Bidens pilosa), a plant that’s likely more familiar to you than you might think – especially if you’ve ever taken a walk through a field and found your socks covered in tiny, barbed seeds! This annual wildflower goes by ...

Hairy Beggarticks: The Sticky Situation in Your Garden

Meet hairy beggarticks (Bidens pilosa), a plant that’s likely more familiar to you than you might think – especially if you’ve ever taken a walk through a field and found your socks covered in tiny, barbed seeds! This annual wildflower goes by several names, including beggartick, burmarigold, and Spanish needle, all of which hint at its most notorious feature: those clingy seeds that seem determined to hitch a ride wherever you’re going.

Where You’ll Find Hairy Beggarticks

Originally from Central and South America, hairy beggarticks has made itself at home across much of North America. You’ll find this adaptable annual growing in states from Alabama to Wisconsin, and from California to Connecticut. It’s also established in Hawaii, Puerto Rico, the U.S. Virgin Islands, and various Pacific territories. The plant thrives in diverse climates and has proven remarkably successful at spreading to new areas.

What Makes This Plant Tick

As an annual, hairy beggarticks completes its entire life cycle in one growing season. The plant produces small, white daisy-like flowers with bright yellow centers that, while modest in size, can be quite charming in the right setting. However, it’s what comes after the flowers that really defines this plant’s character – those infamous barbed seeds that turn every passing animal (or unsuspecting gardener) into a seed dispersal agent.

The plant’s relationship with water is interesting and varies by region. Depending on where you live, it might prefer wetland conditions or be perfectly happy in drier upland areas, making it quite adaptable to different garden situations.

The Garden Perspective: Friend or Foe?

Here’s where things get interesting. Hairy beggarticks sits in that gray area between wildflower and weed, and your perspective might depend entirely on what you’re trying to achieve in your garden.

The Case for Growing It:

  • Excellent pollinator magnet – bees and butterflies love the flowers
  • Thrives in poor soils where other plants struggle
  • Provides late-season blooms when many other flowers are fading
  • Virtually maintenance-free once established
  • Can fill in difficult spots in wild or naturalized gardens

The Case Against:

  • Those sticky seeds can be a real nuisance
  • Self-seeds aggressively and can quickly take over
  • May outcompete native plants in some situations
  • Considered weedy by many gardeners

Growing Hairy Beggarticks Successfully

If you’ve decided to give this plant a try, you’ll find it refreshingly easy to grow. Hairy beggarticks is remarkably unfussy and will grow in USDA hardiness zones 3-11, though remember it’s an annual, so you’ll need new plants each year (which, given its self-seeding tendencies, usually isn’t a problem).

Ideal Growing Conditions:

  • Light: Full sun to partial shade
  • Soil: Tolerates poor soils but prefers well-draining conditions
  • Water: Moderate moisture needs; quite drought-tolerant once established
  • Space: Give it room to spread, as it can reach 2-4 feet tall and wide

Planting and Care Tips

The easiest way to establish hairy beggarticks is simply to scatter seeds in spring after the last frost. The plant will do most of the work from there. If you’re starting with purchased plants, space them about 12-18 inches apart and water regularly until established.

One word of caution: this plant’s enthusiasm for self-seeding means you’ll want to keep an eye on it. Deadhead spent flowers if you want to prevent excessive spread, or let some go to seed if you want more plants next year (spoiler alert: you’ll probably get them whether you want them or not).

A Word About Native Alternatives

While hairy beggarticks can certainly earn its place in the right garden setting, consider exploring native alternatives that provide similar benefits without the potential for aggressive spreading. Native Bidens species like bur marigold (Bidens cernua) or nodding beggartick offer comparable pollinator value while supporting local ecosystems more effectively.

The Bottom Line

Hairy beggarticks is one of those plants that demands an honest conversation with yourself about your gardening goals. If you’re looking for a low-maintenance annual that attracts pollinators and doesn’t mind poor conditions, it might be perfect. But if you prefer a more controlled garden environment or are focused on supporting native plant communities, you might want to look elsewhere.

Whatever you decide, just remember: if you do choose to grow hairy beggarticks, invest in a good lint roller – you’re going to need it!

Wetland Status

The rule of seasoned gardeners and landscapers is to choose the "right plant for the right place" matching plants to their ideal growing conditions, so they'll thrive with less work and fewer inputs. But the simplicity of this catchphrase conceals how tricky plant selection is. While tags list watering requirements, there's more to the story.

Knowing a plant's wetland status can simplify the process by revealing the interaction between plants, water, and soil. Surprisingly, many popular landscape plants are wetland species! And what may be a wetland plant in one area, in another it might thrive in drier conditions. Also, it helps you make smarter gardening choices and grow healthy plants with less care and feeding, saving you time, frustration, and money while producing an attractive garden with greater ecological benefits.

Regions
Status
Moisture Conditions

Arid West

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Atlantic and Gulf Coastal Plain

FAC

Facultative - Plants with this status can occur in wetlands and non-wetlands

Caribbean

FACU

Facultative Upland - Plants with this status usually occurs in non-wetlands but may occur in wetlands

Eastern Mountains and Piedmont

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Great Plains

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Hawaii

FACU

Facultative Upland - Plants with this status usually occurs in non-wetlands but may occur in wetlands

Midwest

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Northcentral & Northeast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Western Mountains, Valleys, and Coast

FACW

Facultative Wetland - Plants with this status usually occurs in wetlands but may occur in non-wetlands

Hairy Beggarticks

Classification

Group

Dicot

Kingdom

Plantae - Plants

Subkingdom

Tracheobionta - Vascular plants

Superdivision

Spermatophyta - Seed plants

Division

Magnoliophyta - Flowering plants

Subdivision
Class

Magnoliopsida - Dicotyledons

Subclass

Asteridae

Order

Asterales

Family

Asteraceae Bercht. & J. Presl - Aster family

Genus

Bidens L. - beggarticks

Species

Bidens pilosa L. - hairy beggarticks

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