Trillium angustipetalum



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We're calling this angustipetalum as it comes true from seed and seems right to us. Others can debate but Trillium nomenclature is still in flux so until it is all settled, this is angustipetalum. Similar to T. kurabayashi, this California native is distinct in this form with large sessile tepals which have no twist. The flowers look as though a French chocolatier created them from rich dark chocolate laden with cocoa fat and infused with Cabernet Sauvignon. They have a depth and saturation of color that is to be envied and carry a smoothly quiet shine. The big foliage is well-spotted early in the season and the entire presentation defies improvement.


Plant Type

  • Perennial / Bulb

Mature Size


Hardiness Zones

  • Zone 5a (-20 °F)
  • Zone 5b (-15 °F)
  • Zone 6a (-10 °F)
  • Zone 6b (-5 °F)
  • Zone 7a (0 °F)
  • Zone 7b (5 °F)
  • Zone 8a (10 °F)
  • Zone 8b (15 °F)
  • Zone 9a (20 °F)
  • Zone 9b (25 °F)

Sun Exposure

  • Shade

Water Needs

  • Moist

Bloom Time

  • Spring