Photo by Melody

PlantFiles: Western Trillium
Trillium ovatum

Family: Trilliaceae
Genus: Trillium (TRIL-ee-um) (Info)
Species: ovatum (oh-VAY-tum) (Info)

7 members have or want this plant for trade.

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24-36 in. (60-90 cm)

6-9 in. (15-22 cm)

USDA Zone 5a: to -28.8 C (-20 F)
USDA Zone 5b: to -26.1 C (-15 F)
USDA Zone 6a: to -23.3 C (-10 F)
USDA Zone 6b: to -20.5 C (-5 F)
USDA Zone 7a: to -17.7 C (0 F)
USDA Zone 7b: to -14.9 C (5 F)
USDA Zone 8a: to -12.2 C (10 F)
USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:
Light Shade

Unknown - Tell us

Bloom Color:
White/Near White

Bloom Time:
Late Winter/Early Spring
Mid Spring
Late Spring/Early Summer


Other details:
Average Water Needs; Water regularly; do not overwater
This plant may be considered a protected species; check before digging or gathering seeds

Soil pH requirements:
5.6 to 6.0 (acidic)
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)

Patent Information:

Propagation Methods:
By dividing rhizomes, tubers, corms or bulbs (including offsets)
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us

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By wannadanc
Thumbnail #1 of Trillium ovatum by wannadanc

By wannadanc
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By kennedyh
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By arsenic
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By arsenic
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By Galanthophile
Thumbnail #7 of Trillium ovatum by Galanthophile

There are a total of 28 photos.
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1 positive
1 neutral
No negatives

Gardeners' Notes:

Positive xyris On Apr 1, 2011, xyris from Sebring, FL (Zone 9b) wrote:

I have hundreds (maybe a few thousand) Trillium ovatum now in flower in natural habitat at my home in Gig Harbor, WA, nearing peak flowering on April 1, 2011. This Trillium seems to grow equally well in swamps on deep muck saturated to the surface almost year round (under mostly deciduous trees) and in well-drained, moist, mostly shady, coniferous forests. There is very little of it in the dense shade of Thuja plicata stands, at least on my property.

Neutral wannadanc On Jun 24, 2001, wannadanc from Olympia, WA wrote:

Trillium ovatum: Western native. Resembles T. grandiflorum but has narrower petals; flowers are usually upright and are borne on stalks.


This plant has been said to grow in the following regions:

Crescent City, California
Saint Paul, Minnesota
Corvallis, Oregon
Eugene, Oregon
Monmouth, Oregon
Salem, Oregon
Artondale, Washington
Bellevue, Washington
Brady, Washington
Kalama, Washington
Olympia, Washington
Port Angeles, Washington
Woodinville, Washington

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