How much sun does Twin Arnica need?

Twin Arnica grows best in full sun conditions.

When does Twin Arnica bloom?

Twin Arnica blooms in May, June, and July.

Where is Twin Arnica native?

Twin Arnica (Arnica sororia) is native to CA, ID, MT, NV and 4 more states, per vouchered herbarium specimen records and regional native plant society lists.

What pollinators does Twin Arnica attract?

Twin Arnica draws bees and butterflies.

Is Twin Arnica HOA-friendly?

Twin Arnica takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Twin Arnica

Name: Pollinator Patch
Author: Pollinator Patch

Arnica sororia

Last reviewed: August 2026

Toxicity unknown

Twin Arnica (Arnica sororia) 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

full sun

Water

low

Size

6"–16" H × 4"–12" W

Bloom

May, Jun, Jul

Native to

CA, ID, MT, NV and 4 more states

Pollinators

bees, butterflies

Before you buy

Your city may pay you to plant this

Cities and water utilities offer rebates for replacing lawn with native and water-wise plants. We track 445 programs across 44 states, each with a link to the provider and the date we last checked it.

Find rebates in your area

Browse plants for this ecoregion

Northwestern Forested Mountains Sierra Nevada North American Deserts Central Basin and Range Northwestern Glaciated Plains Northwestern Great Plains

Twin arnica is a low-growing perennial wildflower native to mountain regions. It produces bright yellow daisy-like blooms from May through July and forms compact clumps that spread slowly over time. This drought-tolerant plant thrives in full sun conditions with minimal water requirements once established.

In an HOA neighborhood

Twin Arnica takes more care to keep looking intentional in a front yard. Maintenance level: low. Consider it for backyard or mid-zone beds rather than the street edge.

Works well in: backyard only.

Appears very wild and informal
May look sparse or weedy outside bloom period
Uncommon plant that HOAs might not recognize as intentional landscaping

Wildlife value

The cheerful yellow flowers attract native bees and butterflies during the spring and early summer blooming period. It provides important nectar resources for pollinators.

Common questions

How much sun does Twin Arnica need?: Twin Arnica grows best in full sun conditions.
When does Twin Arnica bloom?: Twin Arnica blooms in May, June, and July.
Where is Twin Arnica native?: Twin Arnica (Arnica sororia) is native to CA, ID, MT, NV and 4 more states, per vouchered herbarium specimen records and regional native plant society lists.
What pollinators does Twin Arnica attract?: Twin Arnica draws bees and butterflies.
Is Twin Arnica HOA-friendly?: Twin Arnica takes more care to look intentional in a front yard. Consider it for backyard or mid-zone beds rather than the street edge.

Native range data from vouchered herbarium specimen records and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.

Ready to grow Twin Arnica? Add it to your garden in Pollinator Patch to track it and get season-by-season care guidance.

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