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Raised garden bed I – solid 2⅜ in European larchRaised garden bed IRaised garden bedsRaised garden bed L – solid 2⅜ in European larchRaised garden bed LRaised garden bedsRaised garden bed U – solid 2⅜ in European larchRaised garden bed URaised garden bedsBed I with bench – solid 2⅜ in European larchBed I with benchRaised garden bedsBed L with bench – solid 2⅜ in European larchBed L with benchRaised garden bedsSolid bench – solid 2⅜ in European larchSolid benchSeatingPedestal bench – solid 2⅜ in European larchPedestal benchSeatingBench with planter – solid 2⅜ in European larchBench with planterSeatingGarden table – solid 2⅜ in European larchGarden tableSeatingTable and two benches – solid 2⅜ in European larchTable and two benchesSeatingSandbox with seating – solid 2⅜ in European larchSandbox with seatingFor kidsGarden steps – solid 2⅜ in European larchGarden stepsSlope & terrace

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Choose your climateBased on winter hardiness only.

Perennial · Polemoniaceae family

Fall phlox

Phlox paniculata

Full sun to part shade 1 ft 11⅝ in–4 ft 11 in × 1 ft 11⅝ in–2 ft 11⅜ in Flowers June–August to −90 °F
Flower colors Click a color

In short a 10-second read

SunFull sun to part shade
Size1 ft 11⅝ in–4 ft 11 in
spacing 19¾ in
FlowersJune–August
PlantingApril–May, September–October
WinterNo winter protection

Where to plant and how much to water

Sun, soil and water.

It grows best in full sun to part shade, in average to moist soil.

Sun

Sun6 hours or more
Part shade3–6 hours
Shadeunder 3 h

Soil

tolerates any pH
acidicneutralalkaline
average to moisthumus-richloamyclay

Watering

only in dry spellsdo not waterlogless when it rains

Frost

−90 °F
no winter protectiondies back in winter, regrows in spring

How much space it takes

Mature size.

The mature plant next to a person (69 in).

19¾ in3 ft 3⅜ in4 ft 11 in1 ft 11⅝ in–4 ft 11 inspread 1 ft 11⅝ in–2 ft 11⅜ in
1 ft 11⅝ in–4 ft 11 in× spread 1 ft 11⅝ in–2 ft 11⅜ in

Plant 19¾ in apart.

Reaches maturity in about 2–5 years. The final size depends on the cultivar and the spot — we give the range from smallest to largest.

Calendar

Through the year.

Typical for a temperate climate (four seasons). The line shows the current month.

The year at a glance

Flowers: JanuaryFlowers: FebruaryFlowers: MarchFlowers: AprilFlowers: MayFlowers: JuneFlowers: JulyFlowers: AugustFlowers: SeptemberFlowers: OctoberFlowers: NovemberFlowers: DecemberPlanting: JanuaryPlanting: FebruaryPlanting: MarchPlanting: AprilPlanting: MayPlanting: JunePlanting: JulyPlanting: AugustPlanting: SeptemberPlanting: OctoberPlanting: NovemberPlanting: DecemberFeeding: JanuaryFeeding: FebruaryFeeding: MarchFeeding: AprilFeeding: MayFeeding: JuneFeeding: JulyFeeding: AugustFeeding: SeptemberFeeding: OctoberFeeding: NovemberFeeding: DecemberJanFebMarAprMayJunJulAugSepOctNovDec
FlowersPlantingFeeding
Now, in October: a good time for planting (container plant).
JanFebMarAprMayJunJulAugSepOctNovDec

Flowers

JanFebMarAprMayJunJulAugSepOctNovDec

June–August · pink, purple, white, red or blue

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: April–May, September–October

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

March–May

What to plant now (October) full list in October (243) →

Feeding

Nutrition.

Light
balanced fertilizercompost or mulch
JanFebMarAprMayJunJulAugSepOctNovDec

Pests and diseases

Common problems and what to do.

The most common problems in Central Europe. Protection is listed from the gentlest option.

High riskMedium riskLow riskRisk for this plant according to the source · no label = no documented level

What you will see

White powdery coating on leaves and stems.

The source says: it can be very susceptible to powdery mildew.

When to look

From spring onwards

How to protect

  1. Prevention
    • Airy planting, enough space between plants.
    • Do not wet the leaves.
    • In fall, remove fallen diseased leaves (reduces spores in spring).
  2. By hand as soon as the first symptoms appearRemove and destroy affected leaves; do not compost.
  3. Chemical — only when nothing else helps only after cultural measuresOnly minimal and targeted use; a product authorized in your country against powdery mildew.
Powdery mildewsdisease · from spring onwardsHigh risk

What you will see

White powdery coating on leaves and stems.

The source says: it can be very susceptible to powdery mildew.

When to look

From spring onwards

How to protect

  1. Prevention
    • Airy planting, enough space between plants.
    • Do not wet the leaves.
    • In fall, remove fallen diseased leaves (reduces spores in spring).
  2. By hand as soon as the first symptoms appearRemove and destroy affected leaves; do not compost.
  3. Chemical — only when nothing else helps only after cultural measuresOnly minimal and targeted use; a product authorized in your country against powdery mildew.
More about this problem

What you will see

Distorted, narrowed leaves and stems, stunted growth.

How to protect

  1. Prevention
    • Healthy planting stock.
    • Do not move soil from affected places.
  2. By hand once noticedDig up and destroy affected plants.
Stem and bulb eelwormpest

What you will see

Distorted, narrowed leaves and stems, stunted growth.

How to protect

  1. Prevention
    • Healthy planting stock.
    • Do not move soil from affected places.
  2. By hand once noticedDig up and destroy affected plants.
More about this problem
Sources (5)

What to combine it with

Same needs, different flowering.

They share the same sun and soil and flower in other months — so the bed flowers for longer.

common sneezeweed

common sneezeweed

2 ft 11⅜ in–4 ft 11 in
✓flowers August–October
✓lower — for the front
New England aster

New England aster

2 ft 11⅜ in–5 ft 10⅞ in
✓flowers August–October
✓taller — for the back
petunia

petunia

5⅞ in–1 ft 5¾ in
✓flowers May–October
✓lower — for the front

Frequently asked

Quick answers.

When does fall phlox flower?

In June–August; the flowers are pink, purple, white, red or blue.

Does fall phlox tolerate shade?

It tolerates part shade (3–6 hours of sun), but not full shade.

How much space does fall phlox need?

At maturity 1 ft 11⅝ in–2 ft 11⅜ in wide and 1 ft 11⅝ in–4 ft 11 in tall; recommended spacing 19¾ in.

Stem and bulb eelworm — what can you do?

Healthy planting stock. Dig up and destroy affected plants.

Powdery mildews — what can you do?

Airy planting, enough space between plants. Remove and destroy affected leaves; do not compost.

Sources (18) Checked 24 October 2026

Similar plants

Have a look at these too.

monkshood

Aconitum napellus

2 ft 7½ in–4 ft 11 in × 11¾ in–1 ft 7⅝ in
Moderate careperennial
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