Phlox (Annual) Growing Guide
Phlox drummondii
Crop Rotation Group
Miscellaneous ●
Soil
Well-drained soil of average fertility.
Position
Full sun.
Frost tolerant
Limited, though young seedlings often survive light frosts.
Feeding
Mix a light application of a balanced organic fertiliser into the soil prior to planting. In midsummer, drench plants with a liquid fertiliser to prolong bloom time.
Companions
Annual phlox is a heavy bloomer that looks best when grown in clumps or masses. It is an excellent flower to naturalise along fences, or you can include it in a wildflower meadow.
Spacing
Single Plants: 15cm (5") each way (minimum)
Rows: 15cm (5") with 15cm (5") row gap (minimum)
Sow and Plant
Sow annual phlox seeds indoors to get a head start, or you can plant the seeds where you want the plants to grow two weeks before your last spring frost is expected. Transplant carefully, without disturbing the roots.
Our Garden Planner can produce a personalised calendar of when to sow, plant and harvest for your area.
Notes
Annual phlox attracts butterflies and beneficial pollinators. In warmer areas, annual phlox sometimes reseeds but it is never invasive. Colours include rose pink, white, purple and light pink.
Harvesting
After annual phlox has bloomed heavily for a few weeks and is slowing down, cut back the plants by half their size. The new growth will produce a second flush of flowers.
Troubleshooting
In humid areas, powdery mildew often appears on tired plants in late summer.
Planting and Harvesting Calendar
< Back to All Plants
Pests which Affect Phlox (Annual)