How to Grow Creeping Phlox 'Scarlet Flame'
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Creeping Phlox 'Scarlet Flame'
Phlox subulata 'Scarlet Flame'
flowerA low-growing, mat-forming perennial groundcover with needle-like foliage that produces masses of bright scarlet-red flowers in spring. 'Scarlet Flame' is a vibrant cultivar of creeping phlox, reaching only 4-6 inches tall while spreading 12-18 inches wide. It blooms prolifically for 3-4 weeks and is drought-tolerant once established.
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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; highly cold-hardy and heat-tolerant
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Establishment
4-8 weeksYoung transplants develop shallow root systems and compact rosettes of needle-like foliage
Water regularly to establish; apply light mulch around plants but keep away from base to prevent rot. Pinch back if leggy to encourage bushy growth.
Vegetative Growth
Fall through early springPlant spreads horizontally, filling in gaps with dense, low mats of fine-textured evergreen foliage
Continue moderate watering; apply balanced fertilizer in early spring. Remove any dead patches or pest-infested stems.
Flower Bud Formation
2-3 weeks before bloomBright red flower buds form at stem tips in early spring as temperatures warm
Reduce watering slightly; do not fertilize with high-nitrogen as it promotes foliage over flowers. Ensure excellent drainage to prevent stem rot.
Flowering
3-4 weeks (April-May in most zones)Prolific display of bright scarlet-red five-petaled flowers completely covering the foliage
Deadhead spent flowers to extend bloom period by 1-2 weeks, though light deadheading works best. Do not cut back aggressively during bloom.
Post-Bloom & Summer Dormancy
June through AugustFlowers fade; plant enters semi-dormant phase in heat. Foliage may thin slightly; some cultivars look tired by mid-summer
Allow plant to rest; water only during drought. Cut back lightly after bloom if desired to refresh appearance. Apply light mulch to cool soil in hot climates.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Spray with water to dislodge; use insecticidal soap or neem oil in severe cases. Improve air circulation and avoid overhead watering.
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Improve drainage immediately; remove infected stems with clean tools. Do not mulch against base; ensure air circulation. Avoid overhead watering.
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Remove by hand at dusk; use copper barriers or slug baits around plantings. Keep area relatively dry.
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Occurs in humid, poorly ventilated areas. Improve air flow; spray with sulfur or baking soda solution. Avoid overhead watering.
Uses
Groundcover and Rock Garden
Landscape'Scarlet Flame' creates vibrant crimson carpets in rock gardens, alpine troughs, and as edging along paths and borders. Its low profile and spreading habit make it ideal for erosion control on slopes and for filling gaps between pavers. [source]
Pollinator Support
WildlifeThe abundant spring flowers attract bees, butterflies, and other early-season pollinators. It's one of the first nectar sources available in spring. [source]
Cut Flowers
HouseholdThe bright scarlet flowers provide excellent material for fresh spring arrangements and can be cut just as they open to last several days in water. [source]
Xeriscaping and Low-Water Gardens
LandscapeOnce established, 'Scarlet Flame' requires minimal water, making it perfect for drought-tolerant landscaping, native plant gardens, and water-conservation designs. [source]
Harvest Tips
Creeping phlox is not harvested for food. Cut fresh flowers for arrangements just after they fully open by pinching or cutting at the base. Deadhead throughout bloom season by removing spent flower clusters to promote extended flowering.
Fun Facts
- 🌱 Phlox subulata is native to the eastern United States and was among the first North American plants introduced to European gardens in the 1700s.
- 🌱 'Scarlet Flame' produces its most vivid color when grown in cool spring weather; flowers may fade slightly if exposed to extreme heat during bloom.
- 🌱 The foliage remains evergreen in most climates, providing structure and color to rock gardens year-round, even after flowers fade.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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