Primula sieboldii 'Uchu'



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Bold white flowers with broadly rounded petals on this Japanese selection of the species. In Japan in the wild, this primrose is found on grassy edges and mixed with other plants which provide a dappled light. It is also more adapted than most Primula to a bit of summer dry if need be. There is a plant society in Japan devoted solely to this one species and all of its cultivars - truly a descent into a maelstrom to contemplate the infinite variety and permutations that they have with this one Primula species. Love it when something gets taken to the limit.


Plant Type

  • Perennial / Bulb

Mature Size


Hardiness Zones

  • Zone 4a (-30 °F)
  • Zone 4b (-25 °F)
  • 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

  • Part Shade - Part Sun
  • Shade

Water Needs

  • Moist
  • Moderate

Bloom Time

  • Spring