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Purple Flowers

Purple Phlox Flower

Phlox Purple Flower


This genus perennials belongs to the phlox (Polemoniaceae) family from North America that contains 67 species of annuals and perennials plants. This genus varies a lot, starting from carpeting rockery ground covers through wiry-stemmed trailers to large bushy perennials that have strong erect stems. Their foliage is also very different; they can have tiny linear leaves or lance-shaped dark green foliage over 4 in (10 cm) long. When blossoming their showy flower heads is small long-tubed   with 5 widely flared lobes. Depending on the species the flowering season runs from spring to autumn, the predominant flower colors are pink, purple and white.

Top Tip

After flowering
phlox plants should
be trimmed back to
remove all spent
flowers. Thin out
overcrowded plants
at the same time to
encourage healthy
vigorous growth
next season.


The phloxes prefer full sun or half shade places. The phloxes that are grown in hanging baskets and rockery phloxes need fairy light soil.  Border phloxes need a heavier soil that is richer with humus and sometimes they may need staking. The good ventilation is necessary to prevent late-season mildew. The phloxes can propagate in different ways: from seed or cuttings, or by division, it depends on the species. Division and basal stem cuttings from perennials in this genus produce flowering plants in the same year. Aerial parts of phlox are prone to nematode infestation, which is often not easily detectable, so herbaceous border kinds in particular should be increased from root cuttings. Seeds do not usually transmit nematode infestations, cither.


Divide only healthy herbaceous phlox in spring alpines in early autumn. Mat-forming alpines do not respond well to division. Single bud divisions are also possible.


Sow seeds of species at 59°F (15°C) to germinate in 7 - 1 0 days. Shade seedlings of woodland species. Plants flower in the second year.


Alpines that have suitable shoots, and woodland species, may be increased from basal stem cuttings in early spring. They will root at 59°F (15°C). Alternatively, take softwood stem-tip cuttings in late spring; this is a good way of increasing mat-forming alpines. Cuttings of smaller alpine species may be only 1 in (2.5cm) long; root them in a mixture of equal parts sharp sand and sterilized soil. In autumn, lift border phlox and take 1 in (2.5cm) cuttings from thicker roots; place horizontally in trays.


Flower color

Blooming Season

Flower Fragrance

Plant Height

Plant Width

Hardiness Zone

Frost Tolerance

Phlox Carolina

Pink, Purple

Spring to early summer


48 in
120 cm

16-24 in
40 – 60 cm



Phlox divaricate

Blue, Lavender, White



15 in
38 cm

20 – 40 in
50 – 100 cm



Phlox douglasii

Pink, Red, Mauve, Purple

Spring to early summer


2-6 in
5-15 cm

12-20 in
30 – 50 cm



Phlox drummondii

Pink, Red, Mauve, Cream, Purple

Summer to autumn


6-15 in
15-38 cm

8-16 in
20-40 cm



Phlox paniculata

Pink to red, Purple, White

Summer to autumn


24-48 in
60-120 cm

16-36 in
40-90 cm



Phlox subulata

Pink, Lavender – blue, White

Late spring to early summer


2-4 in
5-10 cm

12-30 in
30-75 cm