How to Grow Creeping Phlox From Seeds: A Comprehensive Guide
Growing creeping phlox from seeds involves stratification, a period of cold treatment, followed by indoor sowing or direct sowing outdoors. With proper preparation, patience, and care, you can enjoy a vibrant carpet of color.
Introduction to Creeping Phlox and Seed Propagation
Creeping phlox ( Phlox subulata), also known as moss phlox or moss pink, is a delightful perennial ground cover cherished for its dense, cushion-like foliage and profusion of vibrant blooms in spring. While often propagated through cuttings or division, growing creeping phlox from seeds offers a cost-effective and rewarding alternative. It requires a bit more patience as seedlings take time to mature, but the resulting display of color is well worth the effort.
Benefits of Growing Creeping Phlox from Seeds
Why choose seeds over other methods? Several compelling reasons exist:
- Cost-effectiveness: Seeds are significantly cheaper than purchasing established plants, especially when covering a large area.
- Wider variety selection: You can access a broader range of colors and varieties often unavailable as starts.
- Personal satisfaction: There’s immense joy in nurturing plants from tiny seeds to blossoming beauties.
- Adaptability: Seed-grown plants tend to be more adaptable to the local environment compared to plants started in a greenhouse.
- Large Scale Planting: When you have a large area that needs the ground covering of creeping phlox, seeds are a very cost effective method.
Understanding the Seed Stratification Process
Creeping phlox seeds require stratification to break dormancy. This mimics the natural winter conditions they would experience outdoors. Without stratification, germination rates are significantly reduced.
- What is Stratification? It involves exposing seeds to cold and moist conditions for a specific period.
- Why is it Necessary? Many perennial seeds have an internal mechanism preventing germination until after winter. This ensures they germinate in spring, when conditions are favorable for growth.
- How to Stratify:
- Moisten a paper towel.
- Place the seeds on the moist paper towel.
- Fold the towel and place it in a sealed plastic bag.
- Label the bag with the date and variety.
- Refrigerate for 4-6 weeks at around 40°F (4°C). Check periodically to ensure the towel remains moist but not soggy.
Sowing Creeping Phlox Seeds: Indoors vs. Outdoors
You have two primary options for sowing your stratified creeping phlox seeds: indoors or directly outdoors.
Indoor Sowing:
- Timing: Start seeds 6-8 weeks before the last expected frost.
- Medium: Use a well-draining seed-starting mix.
- Sowing: Sow seeds thinly on the surface of the soil, gently pressing them in. Do not bury deeply.
- Light: Provide bright, indirect light or use grow lights.
- Watering: Keep the soil consistently moist but not waterlogged.
- Temperature: Maintain a temperature of 60-70°F (15-21°C).
- Transplanting: Transplant seedlings outdoors after the last frost when they are large enough to handle. Harden them off gradually by exposing them to increasing periods of outdoor conditions over a week.
Outdoor Sowing:
- Timing: Sow seeds in the fall or early spring.
- Site Preparation: Choose a sunny location with well-drained soil. Remove weeds and debris.
- Sowing: Sow seeds thinly on the surface of the soil. Lightly rake them in.
- Watering: Water gently but thoroughly.
- Protection: Protect seedlings from slugs and snails.
- Weeding: Control weeds regularly to prevent competition.
Soil Requirements and Site Selection
Creeping phlox thrives in well-drained soil and full sun.
- Sunlight: Requires at least 6 hours of direct sunlight per day.
- Soil Type: Prefers slightly acidic to neutral soil (pH 6.0-7.0). Amend heavy clay soil with compost or other organic matter to improve drainage.
- Drainage: Poor drainage can lead to root rot. Ensure the soil drains well.
Caring for Creeping Phlox Seedlings
Once your seedlings emerge, they require consistent care to thrive.
- Watering: Water regularly, especially during dry spells. Avoid overwatering, which can lead to fungal diseases.
- Fertilizing: Feed seedlings with a balanced liquid fertilizer diluted to half strength every 2-3 weeks.
- Weeding: Keep the area around the seedlings free of weeds.
- Pinching: Pinch back the growing tips of young plants to encourage bushier growth.
Common Mistakes and Troubleshooting
Even experienced gardeners can encounter challenges when growing creeping phlox from seed.
- Poor Germination: Often due to insufficient stratification, sowing too deeply, or using old seeds.
- Damping Off: A fungal disease that causes seedlings to collapse and die. Prevent by using a sterile seed-starting mix and providing good air circulation.
- Root Rot: Caused by overwatering or poor drainage. Ensure well-drained soil and avoid overwatering.
- Pests: Slugs and snails can damage seedlings. Use organic pest control methods to protect your plants.
Growing Creeping Phlox from Seeds: A Comparative Table
| Feature | Indoor Sowing | Outdoor Sowing |
|---|---|---|
| Timing | 6-8 weeks before last frost | Fall or early Spring |
| Control | High control over environment | Less control over environment |
| Germination Rate | Potentially higher | Potentially lower |
| Effort | More initial effort | Less initial effort |
| Hardening Off | Required | Not Required |
Frequently Asked Questions (FAQs)
1. How long does it take for creeping phlox seeds to germinate?
Germination typically occurs within 14-21 days under ideal conditions (after stratification and proper sowing). Maintaining consistent moisture and warmth is crucial for successful germination.
2. Can I direct sow creeping phlox seeds in the summer?
Direct sowing in the summer is not recommended. The high temperatures can inhibit germination, and young seedlings may struggle to survive. Fall or early spring sowing is preferable.
3. How often should I water creeping phlox seedlings?
Water when the top inch of soil feels dry to the touch. Aim for consistent moisture but avoid overwatering. Allow the soil surface to dry slightly between waterings.
4. What type of fertilizer is best for creeping phlox seedlings?
Use a balanced liquid fertilizer (e.g., 10-10-10) diluted to half strength. Fertilize every 2-3 weeks to provide essential nutrients for growth.
5. How do I harden off my creeping phlox seedlings before transplanting?
Gradually expose your seedlings to outdoor conditions over a week. Start by placing them in a sheltered location for a few hours each day, gradually increasing the time and exposure to sunlight. This helps them adapt to the harsher outdoor environment.
6. What is the best spacing for planting creeping phlox seedlings?
Space seedlings 6-12 inches apart. This allows them adequate room to spread and form a dense ground cover.
7. How long does it take for creeping phlox to bloom when grown from seed?
Creeping phlox grown from seed typically blooms in its second year. Be patient and continue providing proper care to ensure healthy growth.
8. Can I grow creeping phlox in containers?
Yes, creeping phlox can be grown in containers. Ensure the container has good drainage and use a well-draining potting mix. Water regularly and fertilize as needed.
9. How do I control weeds around creeping phlox?
Hand-pull weeds regularly, especially when the plants are young. Mulch can also help suppress weed growth.
10. Does creeping phlox attract pollinators?
Yes, creeping phlox attracts butterflies, bees, and other beneficial pollinators.
11. Is creeping phlox deer-resistant?
Creeping phlox is considered moderately deer-resistant, but deer may still browse on it if other food sources are scarce.
12. Can I divide my established creeping phlox plants?
Yes, dividing established creeping phlox plants is a great way to propagate them. Do this in the spring or fall. Dig up the plant, gently separate the roots, and replant the divisions.