Spotted Joe-Pye weed

Sun

Full sun to partial shade; flowers best and stands most firmly with at least six hours of direct sun.

Water

Keep consistently moist, especially during establishment and hot weather. Established plants tolerate wet soil and occasional flooding but perform poorly in prolonged drought.

Soil

Moisture-retentive, fertile soil rich in organic matter; tolerates clay and a broad range of soil pH.

Height

4-7 ft (1.2-2.1 m)

Spread

3-4 ft (0.9-1.2 m)

Flowers

Mid-summer to early autumn; broad, often flat-topped clusters of dusty pink to mauve flowers.

Foliage

Coarsely toothed, lance-shaped green leaves arranged in whorls, usually four or five around the stem. Stems are purple-spotted or sometimes almost entirely purple; foliage dies back in winter.

Growth

Moderate to fast; forms a substantial clump over several growing seasons.

Care needed

Low

• Pollinators
• Deer resistant
• Cold hardy
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Easy

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1 ft (0.3 m)

2. After 1 year

   2.8 ft (0.86 m)

3. After 2 years

   5 ft (1.4 m)

4. After 3 years

   5 ft (1.7 m)

   full size

About 2 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Safe

Native to

the US and Canada

Growth rate

Fast

• Water deeply when rainfall is insufficient to keep the root zone moist; do not let newly planted clumps dry out.
• Apply a 2-3 in (5-8 cm) layer of organic mulch in spring, keeping it clear of the crown.
• Top-dress with compost in spring; avoid heavy nitrogen feeding, which can encourage floppy growth.
• Support exposed clumps early in the growing season if wind or partial shade makes stems lean.
• Divide in spring if the clump becomes crowded or outgrows its space; routine annual division is unnecessary.

Pruning. Leave stems and seedheads standing through winter, then cut them to 4-6 in (10-15 cm) above the ground in late winter or early spring before new growth develops. Remove spent flowerheads sooner if you want to limit self-seeding.

Late winter

Cut down last year's stems before new shoots emerge.

Spring

Plant or divide clumps, water thoroughly, and apply compost and mulch.

Late spring

Install discreet supports where wind or shade is likely to cause leaning.

Summer

Check soil moisture during hot spells and water deeply before plants wilt.

Late summer

Enjoy the flowers and visiting insects; remove fading heads only where seedlings would be unwanted.

Autumn

Leave sturdy stems and seedheads for winter structure and wildlife.

• Plant at the back of a large border with asters and tall grasses for late-season height and colour.
• Use in groups beside ponds or in rain gardens where the soil stays moist.
• Combine with ironweed and swamp milkweed in a North American native meadow planting.
• Repeat generous clumps through a naturalistic border to provide upright structure and broad flowerheads.

Garden styles it suits: Native meadow, New perennial (prairie), Wildlife garden, Pollinator garden, Bog garden and Cottage garden.

Plant it with: New England aster, Swamp milkweed, New York ironweed, Switchgrass, Turtlehead and Cardinal flower.

Wildlife: Flowers provide nectar for butterflies, bees and other pollinating insects. Standing stems offer overwintering habitat for insects, and seedheads may attract small seed-eating birds.

• Wilting and scorched leaf edges in dry soil: water deeply and mulch; move the plant if the site is consistently too dry.
• Flopping stems in shade or overly rich soil: provide more sun, reduce nitrogen feeding and support stems early.
• Powdery mildew in crowded plantings: improve spacing and airflow, maintain even soil moisture and remove affected fallen foliage.
• Unwanted seedlings in moist bare ground: remove spent flowerheads before seed disperses and pull seedlings while small.

Not generally known to be toxic to people, cats, dogs or horses, but species-specific information on ingestion is limited. No particular poisonous part is established; do not treat the leaves, stems, flowers or roots as food or home medicine, and seek veterinary or medical advice after substantial ingestion.

• Sweet Joe-Pye weed (Eutrochium purpureum)

  Usually has mostly green stems with purple concentrated at the leaf joints, rather than extensive purple spotting, and more domed flower clusters. Its crushed leaves may smell of vanilla.

• Hollow Joe-Pye weed (Eutrochium fistulosum)

  Often grows taller, with hollow stems, usually more leaves per whorl and more strongly domed flower clusters. Spotted Joe-Pye weed generally has flatter flowerheads and solid stems.

• Common boneset (Eupatorium perfoliatum)

  Has white flowers and opposite pairs of leaves joined around the stem, rather than pinkish flowers and whorls of separate leaves.

The species name maculatum means spotted, referring to the purple markings on the stems.

Propagation. Divide established clumps in early spring as shoots emerge. Sow fresh seed outdoors in autumn, or give stored seed a cold, moist period before spring sowing; seedlings may vary, so divide named cultivars to preserve their characteristics.

Accepted botanical name

Eutrochium maculatum

In the US and Canada

Native in Canada, the lower 48 states and St. Pierre and Miquelon.

Native range

Alberta, Arizona, British Columbia, Colorado, Connecticut, Idaho, Illinois, Indiana, Iowa, Kansas, Maine and Manitoba.

Measured

Soil pH 5.5 to 7. Average height 83 cm.

Sources: GBIF (CC BY 4.0), USDA PLANTS and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.