Garden phlox 'Amethyst'

Phlox paniculata 'Amethyst' | Also known as: Summer phlox 'Amethyst', Phlox 'Amethyst' | Rating: 0 votes | Print / Pdf

Phlox paniculata is a flowering plant native to Eastern America and is also known as garden phlox. It will grow up to 50cm in height and about 40cm wide. The leaves are green, small and narrow and it has attractive saucer-shaped flowers that grow in clusters. They're white, pink, red or purple depending on the variety, and they have a pleasant fragrance. The flowers are fairly small, growing up to about an inch across, but as they grow in clusters they give a good impact. Twelve varieties of Phlox paniculata have been given an Award of Garden Merit by the RHS.

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Known dangers?
  • no
Height [m]
  • 1 - 1.5
Spread [m]
  • 0.75
Dominant flower colour
  • Violet
Flower Fragrance
  • Yes, let it smell
Flowering seasons
  • Mid summer
  • Late summer
  • Early autumn
Foliage in summer
  • Green
Foliage in Autumn
  • Green
Propagation methods
  • basal cuttings
  • division
  • root cuttings
Growth habit
  • Erect
  • Acidic
  • Neutral
  • Alkaline
Hardiness zone
  • Z4-8
Heat zone
  • H8-1
Winter temperatures [°C]
  • -34 - -7
Heat days
  • 0 - 120
  • well-drained but frequently watered
  • poorly-drained
Soil type
  • sandy
  • Clay
  • chalky
  • loams
Sun requirements
  • Full sun
  • Partial shade
  • Exposed
  • Sheltered
Standard category
  • Flowers & bulbs
  • Perennials
Grown for
  • None
Creative category
  • Fine fragrants
  • For Beginners
  • Show-offs
  • For birds & bees
  • Roses & classics
Garden type
  • Cottage garden
  • City
Garden spaces
  • Flower beds
  • Borders
Gardening expertise
  • beginner
Time to reach full size
  • 2 to 5 years
18 Related plants

Garden phlox


Phlox is a genus of 67 flowering plants, a good traditional cottage garden plant, native to North America. There are various different coloured varieties including vibrant pinks, red, white and pastel blue. Most of them have a pleasant scent too. Naturally, phlox grow either in alpine areas or woodland. Depending on your soil type and situation you should choose your phlox accordingly. The alpine species prefer full sun and well-drained soil and the woodland varieties are more suited to areas with partial shade and humus rich soils. If you remove the dead flower heads then more flowers will be produced. When the plant has finished flowering, cut it down to the base.

Phlox adsurgens Wagon Wheel

northern phlox

PLANTS Phlox adsurgens | -34°C - -7°C beginner Partial shade

Phlox adsurgens is a creeping perennial commonly known as northern phlox. This plant has dark green, oval-shaped leaves and produces pretty pink and white flowers with oval petals. Northern phlox should be planted in areas of full sunlight or partial shade. It is best suited to loamy, sandy or chalky soil that offers good drainage. The creeping nature of northern phlox makes it a good choice for ground cover but it also looks stunning within flower beds and borders or used as edging or underplanting. Northern phlox is a striking means of adding colour to low-maintenance garden designs and looks great in cottage and rock gardens as well.

Phlox carolina

Carolina phlox

PLANTS Phlox carolina | -29°C - -7°C beginner Partial shade, Full sun

Phlox carolina is commonly known as Carolina phlox. This eye-catching plant has slender upright stems and produces beautiful clusters of white, pink or purple flowers during summer. Carolina phlox is suited to areas of full sunlight or partial shade within most types of soil including loamy, sandy, chalky and clay as long as it is moist and offers good drainage. This charming plant adds elegance to flower beds and borders and also serves as an attractive choice for underplanting. Carolina phlox looks just as lovely in city and courtyard gardens as it does in cottage or informal garden designs.

Phlox divaricata

blue phlox

PLANTS Phlox divaricata | -34°C - -7°C beginner Partial shade

Phlox divaricata is commonly referred to as blue phlox. This plant produces cheerful bluish-purple flowers that offer a delightful fragrance. Blue phlox should be planted in areas of partial shade or full shade. It grows well in fertile, moist soil including loamy, sandy, chalky and clay soil. The soil should offer good drainage and ideally have a light layer of mulch. The beautiful blooms of this plant attract butterflies and hummingbirds. Blue phlox looks fantastic within rock gardens and cottage gardens and is a superb choice for edging, ground cover or underplanting. It also is a stunning showstopper in flower borders and beds and is a splendid option for low-maintenance garden designs where fragrance and beautiful colour are key.


PLANTS Phlox divaricata subsp. Laphamii | -34°C - -7°C beginner Partial shade

Phlox divaricata subsp. Laphamii is commonly known as wild sweet William and produces clusters of gorgeous purple-blue flowers that offer a subtle fragrance. Wild sweet William should be planted in partially shaded or full shade areas. It can be grown in chalky, sandy, loamy or clay soil that offers good drainage. The soil should be kept moist and an added layer of mulch is appreciated by this plant as well. Wild sweet William makes for very pretty underplanting and is sure to draw the eye within flower borders and beds. This beautiful plant looks spectacular in woodland gardens and is also a bold means of adding colour to rock gardens as long as it is kept in the shadier parts.

phlox 'Chattahoochee'

PLANTS Phlox divaricata subsp. Laphamii 'Chattahoochee' | -34°C - -7°C beginner Partial shade

Phlox douglasii


PLANTS Phlox douglasii | -29°C - -12°C beginner Partial shade, Full sun

Phlox douglasii is commonly known as phlox. Bold, attention-grabbing flowers available in a range of colours including pink, purple and white ensure this plant makes a statement whenever it is in bloom. Phlox is suited to areas of full sunlight or partial shade and appreciates fertile, well-drained soil such as chalky, loamy or sandy soil. This plant does well in a variety of garden designs, from cottage gardens to rock gardens. It can be used as stunning edging and can also be grown in containers and placed on patios or within courtyard gardens for a splash of sassy colour.

Phlox douglasii Crackerjack

phlox 'Crackerjack'

PLANTS Phlox douglasii 'Crackerjack' | -29°C - -12°C beginner Partial shade, Full sun

phlox 'Iceberg'

PLANTS Phlox douglasii 'Iceberg' | -29°C - -12°C beginner Partial shade, Full sun

Phlox Douglasii Red Admiral

phlox 'Red Admiral'

PLANTS Phlox douglasii 'Red Admiral' | -29°C - -12°C beginner Full sun, Partial shade