perennial

Cup Plant

Silphium perfoliatum

Not currently listed at our partner nurseries.

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Essentials

At a Glance

Plant Type

Perennial

Height

96 inches

Width

36 inches

Light

Full Sun, Partial Sun

Zones

4, 5, 6, 7, 8, 9

Water

Medium to wet

Humidity

Average

Lifespan

Perennial

Native To

North America

Toxicity

Non-toxic

The Story

Plant Bio

A tall, clump-forming perennial with stout, square stems. Pairs of large, ovate, toothed leaves are fused at the bases, encircling the stem and forming a 'cup' that holds water. Features sunflower-like yellow flowers in summer. This species is notable for its striking floral display and its ability to attract pollinators, as well as its adaptability to a variety of soil types and conditions.

Bloom Period:

EarlyLate

Uses & Benefits:

Provides tall, striking yellow flowers that attract pollinators and add vibrant color to the garden.

Erosion control and habitat for beneficial insects.

Supports local pollinator populations and native wildlife.

Marketplace

Where to Buy

We couldn't find this plant listed online right now.

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Planting

How to Grow

Tuck seeds into moist soil in early spring.
Keep soil consistently moist during germination.
Thin seedlings to 18 inches apart after emergence.
Water deeply once weekly during dry periods.
Stake tall plants to prevent wind damage.
Deadhead spent flowers to encourage more blooms.

Pro Tip

Plant in full sun with well-drained loamy soil for best results.

Keep It Thriving

Care Guide

Do

Water regularly during dry spells 🌱
Deadhead to prolong flowering
Divide every 3-4 years to maintain health

Don't

Avoid overwatering in winter ❌
Don’t disturb roots during peak flowering
Refrain from fertilizing with high nitrogen

Seasonal Care Calendar

Task	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Divide
Plant
Propagate
Spring Cleanup
Stake

Watch Out For

Pests & Diseases

Common Pests

Common Diseases

In the Garden

Landscape Uses & Companions

Landscape Uses

Erosion-resistant borderWildflower meadow accent

Companion Plants

Echinacea Rudbeckia Swamp Milkweed

Multiply

Propagation Methods

Good to Know

Common Questions

Cup Plant questions

What zones can Cup Plant grow in?

Cup Plant is hardy in USDA Zones 4–9. Inside that range it survives winter in the ground; outside it, grow it as an annual or a container plant you protect.

Is Cup Plant deer resistant?

Yes — Cup Plant is rated deer-resistant. Deer typically pass it over, though extreme hunger can override any plant's defenses.

When does Cup Plant bloom?

Cup Plant typically blooms in mid-summer through late summer. Exact timing shifts a week or two with your zone — Sow's bloom calendar maps it to your garden.

Does Cup Plant need full sun?

Cup Plant does best in full sun to part shade. In hot climates, afternoon shade keeps blooms fresher longer.

Is Cup Plant drought tolerant?

Yes — once established (usually after the first full season), Cup Plant handles dry spells with minimal watering. Water deeply its first year to build the root system that makes that possible.