How much sun does Hartweg's checkerbloom need?

Hartweg's checkerbloom grows best in full sun conditions.

When does Hartweg's checkerbloom bloom?

Hartweg's checkerbloom blooms in April, May, and June.

Where is Hartweg's checkerbloom native?

Hartweg's checkerbloom (Sidalcea hartwegii) is native to CA, per vouchered herbarium specimen records and regional native plant society lists.

What butterflies or moths does Hartweg's checkerbloom host?

Hartweg's checkerbloom is a larval host plant for West Coast lady.

Hartweg's checkerbloom

Name: Pollinator Patch
Author: Pollinator Patch

Sidalcea hartwegii

Last reviewed: November 2026

Hartweg's checkerbloom (Sidalcea hartwegii) is a annual forb native to CA. It blooms in April, May, and June. The flowers draw bees.

Watering reminders and freeze alerts for Hartweg's checkerbloom, free in the app.

Toxicity unknown

Hartweg's checkerbloom (Sidalcea hartwegii) 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

8"–24" H × 8"–12" W

Bloom

Apr, May, Jun

Native to

Pollinators

bees

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Browse plants for this ecoregion

Northwestern Forested Mountains Sierra Nevada Central California Foothills and Coastal Mountains Central California Valley

An upright annual with rounded, lobed leaves and open spikes of pink cup-shaped flowers in spring. It grows scattered through open grassland and completes its cycle before summer drought.

Growing Hartweg's checkerbloom

Grow Hartweg's checkerbloom in full sun and low water. Mature plants reach 8 to 24 inches tall and spread 8 to 12 inches wide.

Wildlife value

Host plant for West Coast lady.

As a member of the mallow family it serves as a larval host for the West Coast lady butterfly, and its flowers feed native bees.

Common questions

How much sun does Hartweg's checkerbloom need?: Hartweg's checkerbloom grows best in full sun conditions.
When does Hartweg's checkerbloom bloom?: Hartweg's checkerbloom blooms in April, May, and June.
Where is Hartweg's checkerbloom native?: Hartweg's checkerbloom (Sidalcea hartwegii) is native to CA, per vouchered herbarium specimen records and regional native plant society lists.
What butterflies or moths does Hartweg's checkerbloom host?: Hartweg's checkerbloom is a larval host plant for West Coast lady.

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.

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 Hartweg's checkerbloom? Add it to your garden in the Pollinator Patch App to track it and get season-by-season care guidance.

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