How much sun does Threeray tarweed need?

Threeray tarweed grows best in full sun conditions.

When does Threeray tarweed bloom?

Threeray tarweed blooms in May, June, and July.

Where is Threeray tarweed native?

Threeray tarweed (Deinandra lobbii) is native to CA, per the World Checklist of Vascular Plants (Kew).

Threeray tarweed

Name: Pollinator Patch
Author: Pollinator Patch

Deinandra lobbii

Last reviewed: September 2026

Threeray tarweed (Deinandra lobbii) is a annual forb native to CA. It blooms in May, June, and July. The flowers draw bees.

Toxicity unknown

Threeray tarweed (Deinandra lobbii) 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

May, Jun, Jul

Native to

Pollinators

bees

Before you buy

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Browse plants for this ecoregion

Central California Foothills and Coastal Mountains Northwestern Forested Mountains

Sticky, resinous annual with narrow leaves and small yellow daisy flowers. Found on grassy slopes and open outcrops, with the strong tar-like scent characteristic of the group.

Growing Threeray tarweed

Grow Threeray tarweed in full sun and low water. Mature plants reach 8 to 24 inches tall and spread 8 to 12 inches wide.

Wildlife value

Flowers provide nectar and pollen for native bees, including tarweed specialist bees.

Common questions

How much sun does Threeray tarweed need?: Threeray tarweed grows best in full sun conditions.
When does Threeray tarweed bloom?: Threeray tarweed blooms in May, June, and July.
Where is Threeray tarweed native?: Threeray tarweed (Deinandra lobbii) is native to CA, per the World Checklist of Vascular Plants (Kew).
What pollinators does Threeray tarweed attract?: Threeray tarweed draws bees.

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.

See all plant problem guides

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

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