When to plant phlox?
- Botanical name
- Phlox paniculata
- Family
- Polemoniaceae
Phlox is planted from September to April. It flowers from July to September.
Phlox is a perennial plant.
Phlox is propagated by division or from cuttings, because a new plant then keeps the qualities of the chosen variety. Root cuttings are taken in autumn, stem cuttings in early summer.
After the first autumn frost the stems are cut low above the ground and the old leaves are cleared off the bed. The rootstock stays in the soil and sends up new shoots in spring.
Phlox through the year
- planting
- flowering
In short
Growing conditions
Is phlox toxic to cats and dogs?
No. Phlox is not toxic to cats and dogs.
Pests and diseases
Listed here is every problem for which the sources name this plant as a host. The problems are not listed in order of how common they are.
- Signs
- A white, floury coating spreads over the leaves, first on the lower and older ones. The leaf under it yellows and dries up. The fruit stays small, because the plant loses leaf surface.
- Prevention
- Plant resistant varieties, leave an airy spacing and sun, and clear the debris at the end of the season. Unlike most fungi it is not helped by wet foliage, since it spreads in heat and high air humidity, in a dry summer too. On soil that holds moisture it is less frequent.
- What to do
- Oil products meant for powdery mildew on the squash family work on contact. They do not cure a leaf that is already affected, but they stop the spread to healthy ones. On herbs cut the affected shoots back instead, since the new growth comes clean. On ornamental perennials what is left is spacing and moisture.
Check the registration and the label before use.
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Sources about the plant: Aktion Das sichere Haus (DSH), Clemson Cooperative Extension, GBIF Backbone Taxonomy, Minnesota Poison Control System, NC State Extension Plant Toolbox, University of Illinois Extension, Wikidata. Checked between 14 and 24 August 2026. The problem descriptions also draw on: KGZS, Royal Horticultural Society, UF/IFAS Extension, University of Maryland Extension, University of Wisconsin-Madison Division of Extension, Utah State University Extension.