How to Grow Gorgeous Creeping Phlox from Seed

Creeping phlox (Phlox subulata) is a stunningly beautiful perennial plant that can transform any landscape with its carpet of vibrant spring blooms Often seen growing along rock walls and cascading down slopes, this hardy groundcover is easy to grow from seed with proper care

An Overview of Creeping Phlox

Creeping phlox is a low-growing species native to North America. With needle-like evergreen foliage and five-petaled flowers in shades of pink, purple, blue, and white, this plant provides color in early spring before most perennials emerge. Creeping phlox spreads readily to form a dense mat, making it perfect for rock gardens, edging, and sloped areas prone to erosion.

When planting creeping phlox from seed, it’s important to select high-quality seeds from reputable sources for the best results. Look for varieties labeled as “Phlox subulata” when searching seed catalogs or nursery websites.

How to Start Creeping Phlox Seeds

Creeping phlox requires a period of cold, moist conditions before seeds will sprout. This natural process occurs outdoors during winter but can be replicated indoors as well

Outdoor Start For winter sowing, spread seeds atop prepared soil in late fall. The freezing temperatures and melting snows naturally stratify the seeds, allowing them to germinate in spring after the soil thaws

Indoor Start: For starting seeds indoors, place seeds in a plastic bag with a damp paper towel and store in the refrigerator for 30-60 days. After chilling, plant the seeds in sterile seed starting mix and provide 16 hours of daily light and temperatures around 65-70°F.

Seeds should sprout within 14-21 days indoors. After the danger of frost has passed, harden off young plants for 7-10 days before transplanting outdoors.

How to Plant Creeping Phlox Seeds Outdoors

For best results, plant creeping phlox seeds directly in the garden. Just follow these simple spring planting tips:

• Choose a site with full sun to partial shade and very well-drained soil. Amend heavy clay soil before planting.

• Prepare the planting bed by removing weeds, debris, and working organic matter into the top 6 inches of soil.

• Sow seeds on the soil surface in early spring after danger of hard frost. Space seeds just 1⁄4 inch apart in rows 15-18 inches apart.

• Cover the seeds lightly with 1⁄8 inch of fine soil or compost. Water gently to avoid washing away these tiny seeds.

• Maintain even moisture by watering daily until seedlings emerge in 14-21 days.

• Thin creeping phlox seedlings to 12-15 inches apart once the first true leaves appear.

How to Care for Creeping Phlox Plants

With proper care after planting, creeping phlox will produce an abundance of flowers and vigorously spread to form a dense, weed-suppressing mat.

Sun and Soil: Grow creeping phlox in average to sandy, well-draining soil. Full sun encourages the most prolific blooms.

Watering: Water once per week, allowing the soil to slightly dry between waterings. Increase frequency during drought.

Fertilizer: Apply balanced fertilizer in early spring and again in midsummer. Avoid high-nitrogen formulas.

Pruning: After flowering ends, shear plants by 1/3 to promote bushy new growth and reblooming.

Mulching: Apply a thin layer of gravel mulch to help retain moisture and keep weeds at bay.

Propagation: Divide established clumps in fall or take 4-6 inch stem cuttings in early summer.

Troubleshooting Common Problems

Though relatively trouble-free, creeping phlox may encounter the following problems which are easily remedied:

• Mildew – Improve air circulation and avoid wetting foliage. Apply neem oil or sulfur powder.

• Aphids – Knock off with a strong spray of water or apply insecticidal soap.

• Root rot – Allow soil to dry between waterings and grow in well-draining soil.

When provided with suitable growing conditions and proper care, creeping phlox is an easy-to-grow perennial that offers multi-season interest through lush evergreen foliage and vibrant spring flowering. By starting with high quality seed and following the simple tips covered here, you can grow a stunning carpet of creeping phlox from seed that will thrive for years to come.

Frequently Asked Questions about Growing Creeping Phlox from Seed

What is the best time to plant creeping phlox seeds outdoors?

The optimal time is early spring after the threat of hard frosts has passed. Sow seeds directly in prepared garden beds once the soil has thawed and warmed to at least 65°F.

How long does it take creeping phlox seeds to germinate?

When sown outdoors in spring, creeping phlox seeds can take 14-21 days to germinate. Be patient and keep soil evenly moist during this period for best results.

Should creeping phlox seeds be covered with soil when planting?

Creeping phlox seeds require light to germinate, so just press them gently into the soil surface without covering. A light layer of compost or fine soil 1⁄8 inch deep is sufficient.

How far apart should creeping phlox plants be spaced?

Space creeping phlox plants 12-15 inches apart to allow for good air circulation. Wider spacing of 18 inches is better in humid climates.

What soil conditions does creeping phlox prefer?

Creeping phlox thrives in average to sandy, well-draining soil with a slightly acidic to neutral pH. Amend clay soils with compost before planting.

Should creeping phlox be fertilized?

Apply a balanced 10-10-10 fertilizer or slow-release granular formula in early spring and again in midsummer. Avoid high nitrogen fertilizers.

How do I propagate more creeping phlox plants?

Take 4-6 inch stem cuttings in early summer or divide plants in early spring or fall. Replant the divisions or root cuttings in potting mix, keeping them moist until established.

Why are my creeping phlox leaves turning yellow?

This can be caused by overwatering, poor drainage, or root rot. Allow soil to dry between waterings and discard any plants with mushy roots or stems.

What pests commonly affect creeping phlox?

Watch for aphids, spider mites, slugs and snails. Control with insecticidal soap, neem oil or hand picking. Avoid chemical pesticides which also kill beneficial insects.

How do I encourage creeping phlox to bloom more?

Provide full sun, trim plants by 1/3 after spring flowering, and fertilize with a balanced formula in early spring and midsummer. Avoid over-fertilizing which leads to foliage growth rather than flowers.