Phlox care

Growing phlox, whether it’s the tall garden variety (Phlox paniculata) or the low-growing creeping type (Phlox subulata), can be rewarding as they are vibrant, hardy plants that add colour to gardens.

Choose the Right Variety

• Garden Phlox (Tall Phlox): Typically grows 2-4 feet tall and blooms in mid to late summer. Great for garden borders.
• Creeping Phlox: A low-growing ground cover that blooms in early spring. Ideal for rock gardens or as a filler between plants.

Location, location, location

• Sunlight: Most phlox varieties thrive in full sun (6-8 hours of direct sunlight). However, some varieties, especially garden phlox, can tolerate partial shade.
• Soil: Phlox prefers well-draining soil that is rich in organic matter. Amend the soil with compost if needed.

Planting Phlox

• Timing:
  • Plant phlox in spring after the danger of frost has passed.
  • For creeping phlox, you can also plant in the autumn, giving it time to establish before winter.
• Spacing:
  • Tall garden phlox should be spaced about 1-2 feet apart to allow for airflow and reduce mildew risk.
  • Creeping phlox needs to be spaced about 12-18 inches apart for ground coverage.
• Depth: Plant phlox at the same depth as it was growing in the pot, with the crown (where stems meet the roots) at soil level

Watering

• Keep the soil consistently moist during the growing season, especially during hot weather. Water deeply at the base of the plant, avoiding wetting the leaves, which can lead to mildew.
• Once established, phlox is fairly drought-tolerant but benefits from regular watering.

Fertilising

• Phlox benefits from feeding in early spring and again after the first bloom to encourage a second round of flowering.
• Apply compost or organic mulch around the plants to enrich the soil and retain moisture.

Pruning and Maintenance

• Deadheading: Regularly remove spent flowers to encourage more blooms and prevent self-seeding.
• Cut Back in Autumn: After the flowering season is over, cut garden phlox back to about 1-2 inches above the soil to prepare for winter.
• Dividing: Every 3-5 years, divide phlox plants to prevent overcrowding and promote healthy growth.

 Common Problems

• Powdery Mildew: This is the most common issue, especially in humid conditions. To prevent this, ensure good air circulation around the plants by proper spacing and avoid overhead watering.

Winter Care

• In colder climates, apply a layer of mulch around the base of the plants to protect the roots from freezing temperatures.
• Creeping phlox is evergreen in mild climates, but in colder zones, it may go dormant and need some winter protection.

By following these steps, you’ll be able to grow healthy, vibrant phlox that will bring beauty to your garden.