Mountainside™ 'Crater Lake' Hybrid Spring Phlox | Proven Winners

This is a new series of Phlox from Proven Winners® is perfect for launching your garden for spring! These serve as a spring groundcover that blooms around the same time as tulips and other bulbs.

Unlike Phlox subulata (creeping phlox) that can easily overtake your garden, the MOUNTAINSIDE™ Phlox are more refined spreaders and are more compressed to the ground. These also bloom 1-2 weeks ahead of Phlox subulata, depending on spring weather. The width is based on three-year plants; the first few years in the ground, plants stay around 12-16" across.

'Crater Lake' has cool indigo purple flowers.

  • Fragrant Flower
  • Salt Tolerant
  • Attracts: Bees, Butterflies, Hummingbirds
  • Native to North America


  • Plant Type: Perennial
  • Height Category: Short
  • Garden Height: 4 - 6 Inches
  • Spacing: 24 - 28 Inches
  • Spread: 24 - 28 Inches
  • Flower Colors: Blue Purple
  • Flower Shade: Indigo Purple
  • Foliage Colors: Green
  • Foliage Shade: Bright green
  • Habit: Spreading 
  • Container Role: Spiller


  • Light Requirement: Sun
  • Maintenance Category: Easy
  • Bloom Time: Early - Mid Spring
  • Hardiness Zones: 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b 
  • Water Category: Average
  • Soil Fertility Requirement: Average Soil, Poor Soil
  • Uses: Border Plant, Container, Landscape, Mass Planting
  • Maintenance Notes: Gritty, slightly alkaline soils are preferred and good drainage is essential. Full sun is essential for performance.
Photos courtesy of Walters Gardens, Inc

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