Phlox Garden Guide
Phlox Stats at a Glance
Botanical Name: Phlox drummondii
Common Name(s): Drummond phlox, annual phlox
Height: up to 1 ½ feet
Soil Conditions: Well-drained, rich, moist soil
Sun: Full sun/partial shade
Soil pH Conditions: 6.1-7.3
Notes: Many species of phlox are perennial.
Starting Phlox from Seed
To start indoors, fill individual peat pots with a fertile commercial soil starter and moisten. Press the seeds lightly into the soil and cover, as they require darkness to germinate. Place in a room with a constant temperature of 70-75°F. Cover with clear plastic wrap to maintain the soil moisture and temperature. Keep the soil moist. When seedlings appear, remove the plastic wrap and move to a sunny location.
When to Start Seeds: 10-12 weeks prior to last spring frost
Time to Germination: 5-10 days
When to Plant Phlox
Spring plantings for areas with cold winters. Fall planting for areas with mild winters.
Where to Plant Phlox
Phlox Plant Spacing
Phlox Care and Maintenance
Remove spent flowers to encourage flowering.
Shear plants in the summer.
Powdery mildew is a concern for this plant so keep plants as dry as possible by watering at the soil level.
The most common pests associated with phlox include spider mites and foliar nematodes.