How big does Garden phlox grow?

About 1 m × 80 cm after ten years (height × width). Its ultimate size is 0.6–1.2 m × 60–90 cm.

What soil does Garden phlox grow in?

It tolerates these soils: average garden soil, clay, calcareous.

Is Garden phlox hardy?

Hardy down to -34 °C (USDA zone 4, RHS H7). It gets through winter in every part of the country.

When does Garden phlox flower?

Flowering: July–September, white, pink, purple, red.

How much water does Garden phlox need?

Water need: medium. Drought tolerance: low.

Garden phlox

Phlox paniculata

Garden phlox (Phlox paniculata) is a perennial that reaches 1 m × 80 cm after ten years. Light: full sun, part shade. Hardy down to -34 °C. Drought tolerance: low. Sold in local shops from about CZK 69.

Illustration of Garden phlox — An illustration of the typical shape of the mature plant, not a photo.

What it's good for, and what it isn't

A classic of the summer border: stiff stems carry large, scented flower heads in white, pink, purple or red that butterflies love. Plant it in sun in fertile soil that does not dry out, and leave space between plants, because crowded clumps easily get mildew. It needs watering in dry spells, ideally at the base.

Watch out for

Not the easiest perennial to grow well. Powdery mildew is the main problem: from midsummer the leaves turn white, especially in dense plantings and on soil that dries out, so thin the stems, avoid overhead watering, and cut down and remove diseased stems in autumn. In the hot, dry summers of Central Europe spider mites also build up and unwatered plants lose their lower leaves. Stem eelworm, phlox bugs and root rot occur as well. Mildew-resistant cultivars are the better choice.

Key facts

Light: Full sun, Part shade
Water need: Medium
Care: Medium
Size after 10 years: 1 m × 80 cm
Hardiness: down to -34 °C
Foliage: Deciduous
Flowering: J F M A M J J A S O N D July–September, white, pink, purple, red

All details

Group	Perennial
Light	Full sun, Part shade
Size after 10 years	1 m × 80 cm
Ultimate size	0.6–1.2 m × 60–90 cm
Hardiness	down to -34 °C (USDA 4, RHS H7)
Soil	Average garden soil, Clay, Calcareous
Foliage	Deciduous
Flowering	July–September, white, pink, purple, red
Water need	Medium
Drought tolerance	Low
Maintenance	Medium
Root aggressiveness	Low
Suckering	no
Spreading	Medium
Distance from buildings	no data
Distance from paving	no data
Litter	not typical
Planting distance	60 cm
For dogs	no data
For cats	Non-toxic (uncertain)
For children	Non-toxic (uncertain)
Typical price	from about CZK 69

Toxicity data is for information only. If your pet or child has eaten a plant, contact a vet or a doctor.

Sizes and prices available

The same plant is sold as a small pot and as a specimen several metres tall, and the price follows. Prices are rounded and for guidance only.

Size	Typical price
size not stated	approx. CZK 69

Frequently asked questions

Data updated: October 17, 2026 · How our data is made

Appears in these lists

Perennials for part shade Perennials for full sun Perennials for clay soil Perennials for pollinators Fragrant plants Fragrant perennials

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