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High-Elevation Firebreak Garden in Colorado: Concentric Irrigation Zones and Unthirsty Perennials

High-Elevation Firebreak Garden in Colorado: Concentric Irrigation Zones and Unthirsty Perennials

In Sugar Loaf (west of Boulder), Laurie Jennings and Doug Sault created a garden of perennials seldom seen at high elevation. Jennings chooses for low water needs over strict cold-hardiness, finding unthirsty plants thriving in Sunset zone 2a.

  • Concentric rings around house correspond to irrigation needs: most water near house.
  • Stacked-stone wall and gravel walk with white Mount Atlas daisies and purple Corsican violets separate watered/unwatered zones.
  • Orange California poppies, purple thyme thrive in unirrigated area.
  • Pastel accents: white Digitalis purpurea 'Alba', yellow foxtail lily (Eremurus bungei), long-spurred 'Swallowtail' columbine.
  • Doubles as firebreak: proved worth in 1989 when devastating fire burned to feet of house but left it unharmed.

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