How much sun does Rayless arnica need?

Rayless arnica grows best in part shade conditions.

When does Rayless arnica bloom?

Rayless arnica blooms in April, May, June, and July.

Where is Rayless arnica native?

Rayless arnica (Arnica discoidea) is native to CA, NV, OR, WA, per the World Checklist of Vascular Plants (Kew).

What pollinators does Rayless arnica attract?

Rayless arnica draws bees and flies.

Rayless arnica

Name: Pollinator Patch
Author: Pollinator Patch

Arnica discoidea

Last reviewed: November 2026

Rayless arnica (Arnica discoidea) is a perennial forb native to CA, NV, OR, WA. It blooms in April, May, June, and July. The flowers draw bees and flies.

Watering reminders and freeze alerts for Rayless arnica, free in the app.

Toxicity unknown

Rayless arnica (Arnica discoidea) is not listed by the ASPCA Animal Poison Control Center (opens in new tab) or the other sources we check, so we have no verdict for it either way. Absence from those lists is not a clearance. If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.

Light

part shade

Water

low

Size

8"–20" H × 8"–12" W

Bloom

Apr, May, Jun, Jul

Native to

CA, NV, OR, WA

Pollinators

bees, flies

Before you buy

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Browse plants for this ecoregion

Coast Range Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Southern California Mountains Southern California/Northern Baja Coast

A woodland perennial with paired hairy leaves and slender stems topped by yellow, button-like flower heads that lack the typical ray petals of most daisies.

Growing Rayless arnica

Grow Rayless arnica in part shade and low water. Mature plants reach 8 to 20 inches tall and spread 8 to 12 inches wide.

Wildlife value

Provides nectar and pollen for small native bees and flies in forest openings.

Common questions

How much sun does Rayless arnica need?: Rayless arnica grows best in part shade conditions.
When does Rayless arnica bloom?: Rayless arnica blooms in April, May, June, and July.
Where is Rayless arnica native?: Rayless arnica (Arnica discoidea) is native to CA, NV, OR, WA, per the World Checklist of Vascular Plants (Kew).
What pollinators does Rayless arnica attract?: Rayless arnica draws bees and flies.

Native range data from the World Checklist of Vascular Plants (Kew). Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

If something looks wrong

Common plant problems, and what to check first

These come up on almost any plant. Each guide lists the likely causes in the order they are worth ruling out, with one thing to check before you act on any of them, and links to the source it came from.

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Ready to grow Rayless arnica? Add it to your garden in the Pollinator Patch App to track it and get season-by-season care guidance.

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