Giant Trillium
Trillium chloropetalum
Last reviewed: June 2026
Giant Trillium (Trillium chloropetalum) is not on the ASPCA Animal Poison Control Center toxic plant list for dogs or cats (aspca.org, last reviewed 2026-05-21). If your pet shows symptoms after eating any plant, call the ASPCA at (888) 426-4435.
Light
part shade
Water
medium
Size
6"–18" H × 6"–12" W
Bloom
Mar, Apr, May
Native to
CA
Pollinators
beetles, flies
Browse plants for this ecoregion
Giant trillium is a striking woodland perennial with large, three-petaled flowers that emerge in spring. The flowers start green and mature to deep maroon above a whorl of three broad, mottled leaves. This slow-growing native creates elegant seasonal interest in shady garden areas.
In an HOA neighborhood
Giant Trillium is an HOA-friendly choice in the right placement. Maintenance level: low. Tidiness: 3 out of 5.
Works well in: mid zone, backyard only, foundation.
- Goes dormant in summer leaving bare spots
- Limited visual impact when not in bloom
- Requires specific woodland conditions that may look out of place in formal landscapes
Wildlife value
Giant trillium attracts specialized beetles and flies that serve as pollinators. The seeds feature elaiosomes that attract ants, which help distribute the seeds throughout woodland areas.
Native range data from the USDA PLANTS Database and regional native plant society lists. Pollinator and host plant associations compiled from GBIF, iNaturalist, and published ecological literature.
Does Giant Trillium fit your yard? Open it in Pollinator Patch to check it against your sun, soil, and HOA-conscious filters.