Polemoniaceae
Phlox alyssifolia subsp. collina
Phlox alyssifolia subsp. collina
Also known as Phlox kelseyi var. collina, Phlox collina
Flowering Plants · Native Plants · Phlox · Native Wildflower · Ground Cover · Rock Garden · Montana Native · Perennial · Part Shade · Flowering · Pollinator · Low Growing
Hill phlox is a low-growing Montana native that thrives in partially shaded rock gardens and borders with well-draining, moderately moist soil. Water regularly but avoid waterlogging, as this subspecies dislikes prolonged wet conditions. Deadhead spent flowers to encourage a longer blooming season and divide clumps every 2–3 years to maintain vigor.
Growing conditions
The details behind the basics
- Daily light
- 4 hours
- Watering
- Water until soil is evenly moist, then allow top inch to dry before watering again · Every 7-10 days
- Maintenance
- Moderate
- Soil
- loam
- Soil pH
- 5.8–7.7
- Temperature
- -10°F to 85°F
- Cycle
- Perennial
Hardiness
USDA 5a-9b
Form & growth
Mature size and habit
- Mature height
- 18 in – 3 ft
- Spread
- 2 ft
- Spacing
- 12 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yes
- Foliage
- Coarse
Ecology & origin
Where it belongs and what it brings
- Native to
- Montana
- Attracts
- Bees, Butterflies
Sources: trefle, usda
More Phlox
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Phlox bifida subsp. stellaria
Phlox bifida subsp. stellaria
Partial Sun · Moderate · Fast
Phlox alyssifolia subsp. abdita
Phlox alyssifolia subsp. abdita
Partial Sun · Moderate · Moderate
Phlox diffusa subsp. longistylis
Phlox diffusa subsp. longistylis
Partial Sun · Moderate · Slow
Forest phlox
Phlox divaricata
Partial Sun · Moderate · Fast
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