American Feverfew

Parthenium integrifolium

Grow American Feverfew (Parthenium integrifolium): full sun to part shade, dry to medium soils; white summer blooms, durable native perennial for prairies and pollinator gardens.

Quick-Care Snapshot

Height: 2-4 ft

Spread: 18-24 in

Growth Rate: Slow

Maintenance: Low

USDA Zones: 4-8

Sunlight: Full Sun

Soil Type: Loam, Clay

Moisture:

Bloom Time: Jun, Jul, Aug

Bloom Color: White

Flower Shape: Composite

Foliage Color: Green

Wildlife Value: Pollinators

Native Range: Great Lakes, Midwest

Overview

American Feverfew is a sturdy native perennial with upright stems, bold green foliage, and flat-topped clusters of creamy white flowers that bloom in early to midsummer. It thrives in full sun to part shade with medium to dry, well-drained soils, develops a deep root system, and adds strong structure and early-season pollinator value to prairie plantings.

Why You’ll Love It

  • Low-maintenance: durable, long lived, and tolerant of heat and drought once established.
  • Pollinator-friendly: flowers attract a wide range of native bees and beneficial insects.
  • Structural form: upright habit and broad leaves provide contrast among finer-textured plants.

Ideal Site & Soil

  • Sun first: full sun supports the strongest growth and best flowering; partial shade is acceptable.
  • Drainage matters: prefers medium to dry, well-drained soils; avoid wet or poorly drained sites.
  • Lean soils: performs best without fertilizer.

Planting Steps

  • From pots: plant at soil line, water deeply to settle roots, and space 18 to 24 inches apart.
  • From seed: fall sow or cold stratify before spring planting; flowering often begins in year two.
  • Root tip: choose planting location carefully and minimize disturbance.

Care Routine

  • Watering: consistent moisture during the first growing season; drought resistant once established.
  • Feeding: skip fertilizer to maintain upright form.
  • Cut back: leave stems standing through winter, then cut back in early spring.
  • Divide: rarely needed; plants prefer to remain undisturbed.

Design & Companions

  • Prairie anchors: pairs well with Prairie Dock (Silphium terebinthinaceum), Purple Coneflower (Echinacea purpurea), and Little Bluestem.
  • Early bloom support: bridges the gap between spring flowers and peak summer prairie blooms.
  • Background plant: works well in mid-to-back border placements.

Common Mistakes

  • Overwatering: causes weak growth and reduced longevity.
  • Excess fertility: leads to floppy stems.
  • Too much shade: reduces flowering and vigor.

Quick Troubleshooting

  • Flopping stems: reduce soil fertility and increase sun exposure.
  • Few flowers: ensure lean soil and adequate light.
  • Slow establishment: normal; deep roots take time to develop.

Where It Fits Best

American Feverfew fits best in sunny borders, prairies, and meadow plantings where strong structure and early-summer blooms are needed. It is especially effective in native landscapes that emphasize durability, pollinator support, and long-term stability.

Published On: December 13th, 2025By

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