Tropaeolum polyphyllum


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This tuberous Nasturtium species from Chile is quite remarkable and has become a focal feature in our front rock garden until it goes dormant for the year in late July. The blue digitate foliage with up to 7 small leaflets arranged circularly drape and spill until obscured by yellow flowers in June-July. This is adapted to unstable rock slopes deep roots form new tubers. Plant the dormant bulb in well-drained soil deeper than you think, no, deeper than that, still deeper - there you go! A foot or foot and a half gets it done. Propagation is by seed or by tubers with large ones getting cut up like you are planting potatoes.


Plant Type

  • Perennial / Bulb

Mature Size

4" x 24"

Hardiness Zones

  • 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

  • Full Sun

Water Needs

  • Moderate

Bloom Time

  • Summer
  • Deer Resistant Plants