Phlox paniculata 'Amethyst' Foerster![RHS Plants for pollinators](/assets/styles/images/icons/RHS_Bee_YELLOW-REGISTERED.png)
![RHS Plants for pollinators](/assets/styles/images/icons/RHS_Bee_YELLOW-REGISTERED.png)
perennial phlox 'Amethyst'
A herbaceous perennial 90-120cm high with green lance-shaped leaves and clusters of scented, deep lavender-violet flowers, slightly infused with rose, from summer to early autumn
![](https://apps.rhs.org.uk/plantselectorimages/detail/elbo08986.jpg)
Buy this plant
Size
Ultimate height
1–1.5 metresTime to ultimate height
2–5 yearsUltimate spread
0.1–0.5 metresGrowing conditions
Moisture
Moist but well–drainedpH
Acid, Alkaline, NeutralColour & scent
Stem | Flower | Foliage | Fruit | |
Spring | Green | |||
---|---|---|---|---|
Summer | Purple Pink | Green | ||
Autumn | Purple Pink | Green | ||
Winter |
Position
- Full sun
Aspect
West–facing or South–facing or East–facing
Exposure
Exposed or Sheltered Hardiness
H7Botanical details
- Family
- Polemoniaceae
- Native to the UK
- No
- Foliage
- Deciduous
- Habit
- Clump forming
- Genus
Phlox may be evergreen or herbaceous, mat-forming or erect perennials or shrubs, with simple leaves and salver-shaped flowers in terminal clusters
- Name status
Accepted
How to grow
Cultivation
Grow in fertile, humus-rich, moisture-retentive soil in full sun, and every autumn add a thick mulch of organic material to help preserve soil moisture
Propagation
Propagate by division in autumn or spring, by basal cuttings in spring or by root cuttings from early autumn to spring; root cuttings are the best method to ensure healthy plants
Suggested planting locations and garden types
- Prairie planting
- City and courtyard gardens
- Cottage and informal garden
- Wildlife gardens
- Flower borders and beds
- Cut flowers
- Wall side borders
Pruning
Deadhead to prolong flowering; cut down to the base in late autumn and remove the cut stems, to reduce the risk of eelworm and mildew the following year
Pests
Generally pest-free but may be susceptible to slugs, snails, aphids, and phlox stem eelworm
Diseases
Generally disease-free but may be susceptible to crown gall, leafy gall, fungal leaf spot, verticillium wilt, and powdery mildews
Get involved
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.