How to Grow Creeping Phlox 'Scarlet Flame'
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Creeping Phlox 'Scarlet Flame'
Phlox subulata 'Scarlet Flame'
flowerCreeping phlox 'Scarlet Flame' is a low-growing, mat-forming perennial ground cover known for its vibrant scarlet-red flowers that blanket the plant in spring. This evergreen cultivar produces narrow, needle-like foliage and is ideal for rock gardens, borders, and slopes. It attracts pollinators and provides long-lasting color with minimal maintenance.
When should you plant Creeping Phlox 'Scarlet Flame' in your zone?
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Example Creeping Phlox 'Scarlet Flame' timeline · Pittsburgh, PA (Zone 6b)
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Plant Creeping Phlox 'Scarlet Flame'
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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First Creeping Phlox 'Scarlet Flame' blooms
Mid-to-late summerBefore the first fall frost (≈ Nov 8)
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Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-8, with best performance in cooler to moderate climates
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Vegetative Growth
6-10 weeksMat expands with dense, fine-textured needle-like leaves spreading horizontally; plant becomes fuller and bushier
Reduce watering frequency as roots establish. Avoid heavy organic mulches. Ensure excellent drainage. No fertilizer needed; excessive nutrients reduce bloom quality.
Flowering
4-6 weeks (typically April-May)Dense clusters of bright scarlet-red five-petaled flowers cover the entire plant, creating a blanket of color
Deadhead spent flowers to encourage continued blooming if desired, though not essential. Maintain moderate watering during bloom. Avoid overhead watering to keep flowers clean.
Post-Bloom
Variable; plant remains evergreen year-roundFlowers fade and seeds set; foliage remains evergreen and attractive through seasons
Optional: shear lightly after bloom to maintain compact form and encourage next season's growth. Reduce watering. No deadheading needed; allow some flowers to remain for wildlife.
Winter Dormancy
Months vary by region (dormant November-March in northern zones)Foliage may darken or bronze slightly in cold climates but remains green and protective; minimal growth activity
No watering needed in most regions. Ensure good drainage to prevent ice damage. Do not mulch heavily. Plant is fully hardy and requires no special winter protection in zones 3-8.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use neem oil if severe. Improve air circulation. Spider mites favor hot, dry conditions.
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Rinse with strong water spray or insecticidal soap. Encourage beneficial insects. Usually self-limiting.
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Prevent with excellent drainage and good air circulation. Avoid overwatering and heavy mulch. Remove affected plants. Amend soil with coarse sand and gravel.
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Improve air circulation; avoid overhead watering. Apply sulfur dust or neem oil if needed. More common in humid, shaded conditions.
Uses
Ground cover and border edging
LandscapeCreeping phlox 'Scarlet Flame' creates vibrant crimson blankets across rock gardens, slopes, pathway edges, and borders. Its mat-forming habit controls erosion and suppresses weeds while providing stunning spring color. [source]
Pollinator attraction
WildlifeThe bright scarlet flowers attract bees, butterflies, and other pollinators, supporting garden ecosystems and fruit/vegetable production in nearby areas. [source]
Cut flower arrangements
CraftCreeping phlox flowers last well in spring floral arrangements and can be used fresh or dried. The delicate clusters add color and texture to mixed bouquets. [source]
Rock garden and alpine gardening
LandscapeIts low-growing habit, preference for well-draining soil, and tolerance of poor conditions make it ideal for rock gardens, alpine troughs, and xeriscaping in dry regions. [source]
Low-maintenance ornamental
Household'Scarlet Flame' requires minimal fertilizer, watering, and pruning once established, making it excellent for low-maintenance landscapes and cottage gardens. [source]
Harvest Tips
Creeping phlox is ornamental and not harvested for food. Cut stems as desired for spring flower arrangements; cutting encourages bushier growth. Deadhead faded flowers in early summer if desired for extended blooming, though not necessary for plant health.
Fun Facts
- 🌱 Phlox subulata 'Scarlet Flame' is native to eastern North America and has been grown as an ornamental for over a century, with numerous cultivars developed for color variation including pink, white, purple, and bicolor forms.
- 🌱 The name 'subulata' refers to the plant's subulate (awl-shaped or needle-like) leaves, which are an adaptation to well-draining, dry soils and allow minimal water loss.
- 🌱 Creeping phlox blooms in spring before most other ground covers, providing some of the earliest and most vibrant color in temperate gardens—it's a favorite subject for garden photographers in April and May.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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