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Perennial · Plumbaginaceae family

Hardy plumbago

Ceratostigma plumbaginoides

Full sun to part shade 0.15–0.25 m × 0.15–0.5 m Flowers August–October to −29 °C
Flower colours Click a colour

In short a 10-second read

SunFull sun to part shade
Size0.15–0.25 m
spacing 30 cm
FlowersAugust–October
PlantingMarch–May, September–November
WinterMulch around the base

Where to plant and how much to water

Sun, soil and water.

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

Sun

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

Soil

tolerates any pH
acidicneutralalkaline
dry to averagesandyloamyclay

Watering

only in dry spellsless when it rains

Frost

−29 °C
mulch around the basedies back in winter, regrows in spring

How much space it takes

Mature size.

The mature plant next to a person (175 cm).

50 cm1 m1.5 m0.15–0.25 mspread 0.15–0.5 m
0.15–0.25 m× spread 0.15–0.5 m

Plant 30 cm 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.

Months for Central Europe. 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

August–October · blue

Planting

JanFebMarAprMayJunJulAugSepOctNovDec

container plant: March–May, September–November

Feeding

JanFebMarAprMayJunJulAugSepOctNovDec

March–May

Feeding

Nutrition.

Light
balanced fertilisercompost 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.

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in a sunny, airy spot with good drainage.
    • Water in dry spells; plants that dry out are more susceptible.
    • Do not over-feed with nitrogen.
    • Water in the morning and do not leave leaves wet for long.
  2. By hand summer, autumnCut out affected shoots; in autumn remove and destroy fallen affected leaves.
Powdery mildewsdisease · from spring onwards

What you will see

White powdery coating on leaves and stems.

When to look

From spring onwards

How to protect

  1. Prevention
    • Plant in a sunny, airy spot with good drainage.
    • Water in dry spells; plants that dry out are more susceptible.
    • Do not over-feed with nitrogen.
    • Water in the morning and do not leave leaves wet for long.
  2. By hand summer, autumnCut out affected shoots; in autumn remove and destroy fallen affected leaves.
More about this problem

What you will see

Root and crown rot, the plant dies back.

How to protect

  1. Prevention
    • Rare.
  2. By hand once noticedRemove the affected plant together with its roots.
Honey fungusdisease

What you will see

Root and crown rot, the plant dies back.

How to protect

  1. Prevention
    • Rare.
  2. By hand once noticedRemove the affected plant together with its roots.
More about this problem
Sources (3)

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.

tussock bellflower

tussock bellflower

0.1–0.3 m
✓flowers May–July
✓taller — for the back
spring crocus

spring crocus

0.08–0.15 m
✓flowers March–May
✓lower — for the front
coralbells

coralbells

0.3–0.45 m
✓flowers May–July
✓taller — for the back

Ready-made Studio combinations with this plant

Click a combination — the Studio opens a new raised bed with it already planted.

Autumn glow — Japanese anemoneAutumn glow — showy stonecropAutumn glow — northern dropseedAutumn glow — hardy plumbagoAutumn glow — woodland sage
Autumn glowAnemones, sedum and low blue flowers open as the rest fade — from August to October.Open in the Studio
Carefree — bloody cranesbillCarefree — catmintCarefree — hardy plumbagoCarefree — blue fescueCarefree — cushion spurge
CarefreeTough perennials that cope with drought and a forgotten watering, blooming from April to October.Open in the Studio

Frequently asked

Quick answers.

When does hardy plumbago flower?

In August–October; the flowers are blue.

Does hardy plumbago tolerate shade?

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

How much space does hardy plumbago need?

At maturity 0.15–0.5 m wide and 0.15–0.25 m tall; recommended spacing 30 cm.

Powdery mildews — what can you do?

Plant in a sunny, airy spot with good drainage. Cut out affected shoots; in autumn remove and destroy fallen affected leaves.

Honey fungus — what can you do?

Rare. Remove the affected plant together with its roots.

Sources (14) Checked 28 September 2026

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